feat: basic universe object tests

Use IUniverseObject.Children to access children

Engine.Core/Abstract/IUniverse.cs

@@ -37,11 +37,21 @@ public interface IUniverse : IEntity, IEnumerable<IUniverseObject>
     /// </summary>
     Event<IUniverse> OnPostDraw { get; }
 
+    /// <summary>
+    /// Event triggered when a <see cref="IUniverseObject"/> is about to be registered to the <see cref="IUniverse"/>.
+    /// </summary>
+    Event<IUniverse, UniverseObjectRegisteredArguments> OnPreUniverseObjectRegistered { get; }
+
     /// <summary>
     /// Event triggered when a <see cref="IUniverseObject"/> is registered to the <see cref="IUniverse"/>.
     /// </summary>
     Event<IUniverse, UniverseObjectRegisteredArguments> OnUniverseObjectRegistered { get; }
 
+    /// <summary>
+    /// Event triggered when a <see cref="IUniverseObject"/> is about to be unregistered from the <see cref="IUniverse"/>.
+    /// </summary>
+    Event<IUniverse, UniverseObjectUnRegisteredArguments> OnPreUniverseObjectUnRegistered { get; }
+
     /// <summary>
     /// Event triggered when a <see cref="IUniverseObject"/> is unregistered from the <see cref="IUniverse"/>.
     /// </summary>

Engine.Core/Abstract/IUniverseObject.cs

@@ -7,7 +7,7 @@ namespace Syntriax.Engine.Core;
 /// This interface allows for tracking the object's presence in the universe and provides events 
 /// for notifying when the see enters or exits the universe.
 /// </summary>
-public interface IUniverseObject : IEntity, IActive, INameable, IHasBehaviourController, IEnumerable<IUniverseObject>
+public interface IUniverseObject : IEntity, IActive, INameable, IHasBehaviourController
 {
     /// <summary>
     /// Event triggered when the <see cref="IUniverseObject"/> enters the universe.
@@ -47,7 +47,7 @@ public interface IUniverseObject : IEntity, IActive, INameable, IHasBehaviourCon
     /// <summary>
     /// The parent <see cref="IUniverseObject"/> of the <see cref="IUniverseObject"/>.
     /// </summary>
-    IUniverseObject? Parent { get; }
+    IUniverseObject? Parent { get; set; }
 
     /// <summary>
     /// The <see cref="IUniverseObject"/>s that have this <see cref="IUniverseObject"/> as their <see cref="Parent"/>.
@@ -75,12 +75,6 @@ public interface IUniverseObject : IEntity, IActive, INameable, IHasBehaviourCon
     /// </returns>
     internal bool ExitUniverse();
 
-    /// <summary>
-    /// Sets the parent <see cref="IUniverseObject"/> of this <see cref="IUniverseObject"/>.
-    /// </summary>
-    /// <param name="universeObject">The parent <see cref="IUniverseObject"/> to set.</param>
-    void SetParent(IUniverseObject? universeObject);
-
     /// <summary>
     /// Adds a child <see cref="IUniverseObject"/> to this <see cref="IUniverseObject"/>.
     /// </summary>

Engine.Core/BehaviourBase.cs

@@ -44,6 +44,7 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
         _behaviourController = behaviourController;
         OnAssign(behaviourController);
         behaviourController.OnUniverseObjectAssigned.AddListener(delegateOnUniverseObjectAssigned);
+        behaviourController.StateEnable.OnEnabledChanged.AddListener(delegateOnStateEnabledChanged);
         if (behaviourController.UniverseObject is not null)
             OnUniverseObjectAssigned(behaviourController);
         OnBehaviourControllerAssigned?.Invoke(this);
@@ -68,6 +69,7 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
         BehaviourController.UniverseObject.OnActiveChanged.RemoveListener(delegateOnUniverseObjectActiveChanged);
         StateEnable.OnEnabledChanged.RemoveListener(delegateOnStateEnabledChanged);
         BehaviourController.OnUniverseObjectAssigned.RemoveListener(delegateOnUniverseObjectAssigned);
+        BehaviourController.StateEnable.OnEnabledChanged.RemoveListener(delegateOnStateEnabledChanged);
         base.UnassignInternal();
         _behaviourController = null!;
     }
@@ -76,6 +78,8 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
     {
         Debug.Assert.AssertBehaviourControllerAssigned(this);
         Debug.Assert.AssertStateEnableAssigned(this);
+
+        UpdateActive();
     }
 
     private void OnStateEnabledChanged(IStateEnable sender, IStateEnable.EnabledChangedArguments args) => UpdateActive();
@@ -84,7 +88,7 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
     private void UpdateActive()
     {
         bool previousActive = IsActive;
-        _isActive = StateEnable.Enabled && _behaviourController.UniverseObject.IsActive;
+        _isActive = StateEnable.Enabled && _behaviourController.StateEnable.Enabled && _behaviourController.UniverseObject.IsActive;
 
         if (previousActive != IsActive)
             OnActiveChanged?.Invoke(this, new(previousActive));

Engine.Core/BehaviourCollector.cs

@@ -76,7 +76,7 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
             OnUniverseObjectRegistered(universe, new(universeObject));
 
         universe.OnUniverseObjectRegistered.AddListener(delegateOnUniverseObjectRegistered);
-        universe.OnUniverseObjectUnRegistered.AddListener(delegateOnUniverseObjectUnregistered);
+        universe.OnPreUniverseObjectUnRegistered.AddListener(delegateOnUniverseObjectUnregistered);
 
         Universe = universe;
         OnAssign(universe);
@@ -94,7 +94,7 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
             OnUniverseObjectUnregistered(Universe, new(universeObject));
 
         Universe.OnUniverseObjectRegistered.RemoveListener(delegateOnUniverseObjectRegistered);
-        Universe.OnUniverseObjectUnRegistered.RemoveListener(delegateOnUniverseObjectUnregistered);
+        Universe.OnPreUniverseObjectUnRegistered.RemoveListener(delegateOnUniverseObjectUnregistered);
 
         Universe = null!;
         OnUnassigned?.Invoke(this);

Engine.Core/BehaviourController.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace Syntriax.Engine.Core;
 
@@ -50,17 +49,13 @@ public class BehaviourController : BaseEntity, IBehaviourController
 
     public IReadOnlyList<T> GetBehaviours<T>()
     {
-        List<T>? behaviours = null;
+        List<T> behaviours = [];
+
         foreach (IBehaviour behaviourItem in this.behaviours)
-        {
+            if (behaviourItem is T behaviour)
-            if (behaviourItem is not T behaviour)
-                continue;
-
-            behaviours ??= [];
                 behaviours.Add(behaviour);
-        }
 
-        return behaviours ?? Enumerable.Empty<T>().ToList();
+        return behaviours;
     }
 
     public void GetBehaviours<T>(IList<T> results)
@@ -77,7 +72,7 @@ public class BehaviourController : BaseEntity, IBehaviourController
 
     public void RemoveBehaviour<T>(bool removeAll = false) where T : class, IBehaviour
     {
-        for (int i = behaviours.Count; i >= 0; i--)
+        for (int i = behaviours.Count - 1; i >= 0; i--)
         {
             if (behaviours[i] is not T behaviour)
                 continue;

Engine.Core/Debug/AssertHelpers.cs

@@ -10,21 +10,21 @@ public static class Assert
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void AssertBehaviourControllerAssigned(IHasBehaviourController assignable)
-        => System.Diagnostics.Debug.Assert(assignable.BehaviourController is not null, $"{assignable.GetType().Name} must be initialized");
+        => System.Diagnostics.Debug.Assert(assignable.BehaviourController is not null, $"{assignable.GetType().Name} must be assigned an {nameof(IBehaviourController)}");
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void AssertEntityAssigned(IHasEntity assignable)
-        => System.Diagnostics.Debug.Assert(assignable.Entity is not null, $"{assignable.GetType().Name} must be initialized");
+        => System.Diagnostics.Debug.Assert(assignable.Entity is not null, $"{assignable.GetType().Name} must be assigned an {nameof(IEntity)}");
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void AssertUniverseAssigned(IHasUniverse assignable)
-        => System.Diagnostics.Debug.Assert(assignable.Universe is not null, $"{assignable.GetType().Name} must be initialized");
+        => System.Diagnostics.Debug.Assert(assignable.Universe is not null, $"{assignable.GetType().Name} must be assigned an {nameof(IUniverse)}");
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void AssertUniverseObjectAssigned(IHasUniverseObject assignable)
-        => System.Diagnostics.Debug.Assert(assignable.UniverseObject is not null, $"{assignable.GetType().Name} must be initialized");
+        => System.Diagnostics.Debug.Assert(assignable.UniverseObject is not null, $"{assignable.GetType().Name} must be assigned an {nameof(IUniverseObject)}");
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void AssertStateEnableAssigned(IHasStateEnable assignable)
-        => System.Diagnostics.Debug.Assert(assignable.StateEnable is not null, $"{assignable.GetType().Name} must be initialized");
+        => System.Diagnostics.Debug.Assert(assignable.StateEnable is not null, $"{assignable.GetType().Name} must be assigned an {nameof(IStateEnable)}");
 }

Engine.Core/Debug/FileLogger.cs

@@ -7,14 +7,23 @@ public class FileLogger : LoggerBase
 {
     public readonly string FilePath;
 
-    public FileLogger(string filePath)
-    {
-        FilePath = filePath;
-        File.Open(filePath, FileMode.Create).Close();
-    }
-
     protected override void Write(string message)
     {
         File.AppendAllTextAsync(FilePath, $"{message}{Environment.NewLine}");
     }
+
+    public FileLogger(string filePath)
+    {
+        FilePath = filePath;
+
+        bool isRelativePath = Path.GetFullPath(filePath).CompareTo(filePath) != 0;
+
+        if (isRelativePath)
+            FilePath = Path.GetFullPath(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, filePath));
+
+        if (Path.GetDirectoryName(FilePath) is string directoryPath)
+            Directory.CreateDirectory(directoryPath);
+
+        File.Open(FilePath, FileMode.Create).Close();
+    }
 }

Engine.Core/Debug/ILogger.cs

@@ -2,12 +2,15 @@ namespace Syntriax.Engine.Core.Debug;
 
 public interface ILogger
 {
+    static ILogger Shared { get; set; } = new ConsoleLogger();
+
     Level FilterLevel { get; set; }
 
     void Log(string message, Level level = Level.Info, bool force = false);
 
     enum Level
     {
+        Trace,
         Info,
         Warning,
         Error,

Engine.Core/Debug/LoggerBase.cs

@@ -4,7 +4,7 @@ namespace Syntriax.Engine.Core.Debug;
 
 public abstract class LoggerBase : ILogger
 {
-    public ILogger.Level FilterLevel { get; set; } = ILogger.Level.Info;
+    public ILogger.Level FilterLevel { get; set; } = ILogger.Level.Trace;
 
     public void Log(string message, ILogger.Level level = ILogger.Level.Info, bool force = false)
     {

Engine.Core/Debug/LoggerContainer.cs

@@ -0,0 +1,9 @@
+namespace Syntriax.Engine.Core.Debug;
+
+public class LoggerContainer : Behaviour, ILogger
+{
+    public ILogger Logger { get; set; } = ILogger.Shared;
+
+    public ILogger.Level FilterLevel { get => Logger.FilterLevel; set => Logger.FilterLevel = value; }
+    public void Log(string message, ILogger.Level level = ILogger.Level.Info, bool force = false) => Logger.Log(message, level, force);
+}

Engine.Core/Debug/LoggerExtensions.cs

@@ -16,13 +16,21 @@ public static class LoggerExtensions
     public static void LogError<T>(this ILogger logger, T caller, string message, bool force = false)
     {
         Log(logger, caller, message, ILogger.Level.Error, force);
-        Log(logger, caller, $"{nameof(StackTrace)}:{Environment.NewLine}{new StackTrace()}");
+        LogTrace(logger, caller, new StackTrace(), force);
     }
 
     public static void LogException<T>(this ILogger logger, T caller, Exception exception, bool force = false)
     {
+        Log(logger, caller, $"Exception of type {exception.GetType().Name} occured", ILogger.Level.Error, force);
         Log(logger, caller, $"Message: {exception.Message}", ILogger.Level.Error, force);
         Log(logger, caller, $"InnerException: {exception.InnerException}", ILogger.Level.Error, force);
-        Log(logger, caller, $"{nameof(StackTrace)}:{Environment.NewLine}{exception.StackTrace}");
+
+        // Not using LogTrace because exception.StackTrace is a type of string
+        Log(logger, caller, $"{nameof(StackTrace)}:{Environment.NewLine}{exception.StackTrace}", ILogger.Level.Trace);
+    }
+
+    public static void LogTrace<T>(this ILogger logger, T caller, StackTrace? stackTrace = null, bool force = false)
+    {
+        Log(logger, caller, $"{nameof(StackTrace)}:{Environment.NewLine}{stackTrace ?? new()}", ILogger.Level.Trace, force);
     }
 }

Engine.Core/Debug/LoggerWrapper.cs

@@ -0,0 +1,23 @@
+namespace Syntriax.Engine.Core.Debug;
+
+public class LoggerWrapper(ILogger firstLogger, ILogger secondLogger) : ILogger
+{
+    private readonly ILogger firstLogger = firstLogger;
+    private readonly ILogger secondLogger = secondLogger;
+
+    public ILogger.Level FilterLevel
+    {
+        get => firstLogger.FilterLevel;
+        set
+        {
+            firstLogger.FilterLevel = value;
+            secondLogger.FilterLevel = value;
+        }
+    }
+
+    public void Log(string message, ILogger.Level level = ILogger.Level.Info, bool force = false)
+    {
+        firstLogger.Log(message, level, force);
+        secondLogger.Log(message, level, force);
+    }
+}

Engine.Core/Debug/LoggerWrapperExtensions.cs

@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core.Debug;
+
+public static class LoggerWrapperExtensions
+{
+    public static ILogger WrapWith(this ILogger thisLogger, ILogger logger) => new LoggerWrapper(thisLogger, logger);
+}

Engine.Core/Extensions/BehaviourControllerExtensions.cs

@@ -27,7 +27,7 @@ public static class BehaviourControllerExtensions
     /// <param name="behaviourController">The <see cref="IBehaviourController"/> to start searching from.</param>
     /// <returns>The <see cref="IBehaviour"/> of the specified type if found; otherwise, throws <see cref="BehaviourNotFoundException"/>.</returns>
     public static T GetRequiredBehaviour<T>(this IBehaviourController behaviourController) where T : class
-        => behaviourController.GetBehaviour<T>() ?? throw new BehaviourNotFoundException($"{behaviourController.UniverseObject.Name}'s {nameof(IBehaviourController)} does not contain any {typeof(T).FullName}");
+        => behaviourController.GetBehaviour<T>() ?? throw new BehaviourNotFoundException($"{behaviourController.UniverseObject?.Name ?? "NULL"}'s {nameof(IBehaviourController)} does not contain any {typeof(T).FullName}");
 
     /// <summary>
     /// Gets an existing <see cref="IBehaviour"/> of the specified type, or adds and returns a new one if it doesn't exist.
@@ -93,7 +93,7 @@ public static class BehaviourControllerExtensions
     /// <param name="behaviourController">The <see cref="IBehaviourController"/> to start searching from.</param>
     /// <returns>The <see cref="IBehaviour"/> of the specified type if found; otherwise, throws <see cref="BehaviourNotFoundException"/>.</returns>
     public static T GetRequiredBehaviourInParent<T>(this IBehaviourController behaviourController) where T : class
-        => behaviourController.GetBehaviourInParent<T>() ?? throw new BehaviourNotFoundException($"{behaviourController.UniverseObject.Name}'s {nameof(IBehaviourController)} does not contain any {typeof(T).FullName} on any parent");
+        => behaviourController.GetBehaviourInParent<T>() ?? throw new BehaviourNotFoundException($"{behaviourController.UniverseObject?.Name ?? "NULL"}'s {nameof(IBehaviourController)} does not contain any {typeof(T).FullName} on any parent");
 
     /// <summary>
     /// Gets all <see cref="IBehaviour"/>s of the specified type in it's <see cref="IUniverseObject"/>'s parents recursively and stores them in the provided list.
@@ -140,7 +140,7 @@ public static class BehaviourControllerExtensions
         if (behaviourController.GetBehaviour<T>() is T localBehaviour)
             return localBehaviour;
 
-        foreach (IUniverseObject child in behaviourController.UniverseObject)
+        foreach (IUniverseObject child in behaviourController.UniverseObject.Children)
             if (GetBehaviourInChildren<T>(child.BehaviourController) is T behaviour)
                 return behaviour;
 
@@ -154,7 +154,7 @@ public static class BehaviourControllerExtensions
     /// <param name="behaviourController">The <see cref="IBehaviourController"/> to start searching from.</param>
     /// <returns>The <see cref="IBehaviour"/> of the specified type if found; otherwise, throws <see cref="BehaviourNotFoundException"/>.</returns>
     public static T GetRequiredBehaviourInChildren<T>(this IBehaviourController behaviourController) where T : class
-        => behaviourController.GetBehaviourInChildren<T>() ?? throw new BehaviourNotFoundException($"{behaviourController.UniverseObject.Name}'s {nameof(IBehaviourController)} does not contain any {typeof(T).FullName} on any children ");
+        => behaviourController.GetBehaviourInChildren<T>() ?? throw new BehaviourNotFoundException($"{behaviourController.UniverseObject?.Name ?? "NULL"}'s {nameof(IBehaviourController)} does not contain any {typeof(T).FullName} on any children ");
 
     /// <summary>
     /// Gets all <see cref="IBehaviour"/>s of the specified type in it's <see cref="IUniverseObject"/>'s children recursively and stores them in the provided list.
@@ -176,7 +176,7 @@ public static class BehaviourControllerExtensions
         foreach (T behaviour in cache)
             behaviours.Add(behaviour);
 
-        foreach (IUniverseObject child in universeObject)
+        foreach (IUniverseObject child in universeObject.Children)
             TraverseChildrenForBehaviour(child, behaviours, cache);
     }
 }

Engine.Core/Extensions/UniverseObjectExtensions.cs

@@ -12,7 +12,7 @@ public static class UniverseObjectExtensions
         if (!string.IsNullOrWhiteSpace(name))
             universeObject.Name = name;
         if (parent is not null)
-            universeObject.SetParent(parent);
+            universeObject.Parent = parent;
         return universeObject;
     }
 
@@ -81,7 +81,7 @@ public static class UniverseObjectExtensions
     /// <returns>The <see cref="IUniverseObject"/> of the specified type if found; otherwise, null.</returns>
     public static T? GetUniverseObjectInParent<T>(this IUniverseObject universeObject) where T : class
     {
-        if (universeObject.GetUniverseObject<T>() is T localUniverseObject)
+        if (universeObject.Children.GetUniverseObject<T>() is T localUniverseObject)
             return localUniverseObject;
 
         IUniverseObject? parent = universeObject;
@@ -129,10 +129,10 @@ public static class UniverseObjectExtensions
     /// <returns>The <see cref="IUniverseObject"/> of the specified type if found; otherwise, null.</returns>
     public static T? GetUniverseObjectInChildren<T>(this IUniverseObject universeObject) where T : class
     {
-        if (universeObject.GetUniverseObject<T>() is T localUniverseObject)
+        if (universeObject.Children.GetUniverseObject<T>() is T localUniverseObject)
             return localUniverseObject;
 
-        foreach (IUniverseObject child in universeObject)
+        foreach (IUniverseObject child in universeObject.Children)
             if (GetUniverseObjectInChildren<T>(child) is T behaviour)
                 return behaviour;
 
@@ -246,7 +246,7 @@ public static class UniverseObjectExtensions
 
         foreach (IUniverseObject universeObject in universeObjects)
         {
-            universeObject.Find(cache);
+            universeObject.Children.Find(cache);
             foreach (T behaviour in cache)
                 instances.Add(behaviour);
         }

Engine.Core/Factory/BehaviourControllerFactory.cs

@@ -4,10 +4,10 @@ namespace Syntriax.Engine.Core.Factory;
 
 public class BehaviourControllerFactory
 {
-    public static IBehaviourController Instantiate(IUniverseObject universeObject)
+    public static IBehaviourController Instantiate(IUniverseObject universeObject, IStateEnable? stateEnable = null)
-        => Instantiate<BehaviourController>(universeObject);
+        => Instantiate<BehaviourController>(universeObject, stateEnable);
 
-    public static T Instantiate<T>(IUniverseObject universeObject, params object?[]? args)
+    public static T Instantiate<T>(IUniverseObject universeObject, IStateEnable? stateEnable = null, params object?[]? args)
         where T : class, IBehaviourController
     {
         T behaviourController = TypeFactory.Get<T>(args);
@@ -18,6 +18,17 @@ public class BehaviourControllerFactory
         if (!behaviourController.Assign(universeObject))
             throw AssignFailedException.From(behaviourController, universeObject);
 
+        if (stateEnable is not null)
+        {
+            if (!stateEnable.Assign(behaviourController))
+                throw AssignFailedException.From(stateEnable, behaviourController);
+
+            if (!behaviourController.Assign(stateEnable))
+                throw AssignFailedException.From(behaviourController, stateEnable);
+        }
+        else
+            StateEnableFactory.Instantiate(behaviourController);
+
         return behaviourController;
     }
 }

Engine.Core/Factory/BehaviourFactory.cs

@@ -12,12 +12,15 @@ public class BehaviourFactory
     {
         T behaviour = TypeFactory.Get<T>(args);
 
-        stateEnable ??= TypeFactory.Get<StateEnable>();
+        if (stateEnable is not null)
+        {
             if (!stateEnable.Assign(behaviour))
                 throw AssignFailedException.From(stateEnable, behaviour);
-
             if (!behaviour.Assign(stateEnable))
                 throw AssignFailedException.From(behaviour, stateEnable);
+        }
+        else
+            StateEnableFactory.Instantiate(behaviour);
 
         return behaviour;
     }

Engine.Core/Factory/UniverseObjectFactory.cs

@@ -18,18 +18,25 @@ public class UniverseObjectFactory
     {
         T universeObject = TypeFactory.Get<T>(args);
 
-        behaviourController ??= TypeFactory.Get<BehaviourController>();
+        if (behaviourController is not null)
-        stateEnable ??= TypeFactory.Get<StateEnable>();
+        {
-
             if (!behaviourController.Assign(universeObject))
                 throw AssignFailedException.From(behaviourController, universeObject);
-        if (!stateEnable.Assign(universeObject))
-            throw AssignFailedException.From(stateEnable, universeObject);
-
             if (!universeObject.Assign(behaviourController))
                 throw AssignFailedException.From(universeObject, behaviourController);
+        }
+        else
+            BehaviourControllerFactory.Instantiate(universeObject);
+
+        if (stateEnable is not null)
+        {
+            if (!stateEnable.Assign(universeObject))
+                throw AssignFailedException.From(stateEnable, universeObject);
             if (!universeObject.Assign(stateEnable))
                 throw AssignFailedException.From(universeObject, stateEnable);
+        }
+        else
+            StateEnableFactory.Instantiate(universeObject);
 
         return universeObject;
     }

Engine.Core/Helpers/Event.cs

@@ -1,35 +1,146 @@
 using System;
 using System.Collections.Generic;
 
+using Syntriax.Engine.Core.Debug;
+
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents a simple event with no parameters.
+/// <para>Example usage:</para> 
+/// <code>
+/// public class MyBehaviour : Behaviour, IUpdate
+/// {
+///     public readonly Event MyEvent = new();
+/// 
+///     public MyBehaviour()
+///     {
+///         MyEvent.AddListener(OnEventTriggered);
+///         MyEvent.AddOneTimeListener(OnEventTriggeredOneTime);
+///     }
+/// 
+///     public void Update()
+///     {
+///         MyEvent.Invoke();
+///     }
+/// 
+///     private void OnEventTriggered()
+///     {
+///         Console.WriteLine($"Event occurred!");
+///     }
+/// 
+///     private static void OnEventTriggeredOneTime()
+///     {
+///         Console.WriteLine($"Event called once!");
+///     }
+/// }
+/// </code>
+/// The output of the example code above would be: 
+/// <code>
+/// Event occurred!
+/// Event called once!
+/// Event occurred!
+/// Event occurred!
+/// Event occurred!
+/// ...
+/// </code>
+/// </summary>
 public class Event
 {
-    private readonly List<EventHandler> listeners = null!;
+    // We use Ascending order because draw calls are running from last to first
-    private readonly List<EventHandler> onceListeners = null!;
+    private static readonly Comparer<ListenerData> SortByAscendingPriority = Comparer<ListenerData>.Create((x, y) => x.Priority.CompareTo(y.Priority));
 
-    public void AddListener(EventHandler listener) => listeners.Add(listener);
+    private ILogger _logger = ILogger.Shared;
-    public void AddOnceListener(EventHandler listener) => onceListeners.Add(listener);
+    public ILogger Logger { get => _logger; set => _logger = value ?? ILogger.Shared; }
-    public void RemoveListener(EventHandler listener) => listeners.Remove(listener);
+
-    public void RemoveOnceListener(EventHandler listener) => onceListeners.Remove(listener);
+    private readonly List<ListenerData> listeners = null!;
+    private readonly List<ListenerData> onceListeners = null!;
+
+    /// <summary>
+    /// Subscribes the callback to be invoked whenever the event is triggered.
+    /// </summary>
+    /// <param name="listener">The callback to be called when the event is triggered.</param>
+    /// <param name="priority">Priority of the callback.</param>
+    public void AddListener(EventHandler listener, int priority = 0)
+    {
+        ListenerData listenerData = new(listener, priority);
+
+        int insertIndex = listeners.BinarySearch(listenerData, SortByAscendingPriority);
+        if (insertIndex < 0)
+            insertIndex = ~insertIndex;
+
+        listeners.Insert(insertIndex, listenerData);
+    }
+
+    /// <summary>
+    /// Subscribes the callback to be invoked the next time the event is triggered. The callback will be called only once.
+    /// </summary>
+    /// <param name="listener">The callback to be called the next time the event is triggered.</param>
+    /// <param name="priority">Priority of the callback.</param>
+    public void AddOneTimeListener(EventHandler listener, int priority = 0)
+    {
+        ListenerData listenerData = new(listener, priority);
+
+        int insertIndex = onceListeners.BinarySearch(listenerData, SortByAscendingPriority);
+        if (insertIndex < 0)
+            insertIndex = ~insertIndex;
+
+        onceListeners.Insert(insertIndex, listenerData);
+    }
+
+    /// <summary>
+    /// Unsubscribes the callback that was previously registered by <see cref="AddListener(EventHandler)"/>.
+    /// </summary>
+    /// <param name="listener">The callback that was previously registered by <see cref="AddListener(EventHandler)"/></param>
+    public void RemoveListener(EventHandler listener)
+    {
+        for (int i = listeners.Count - 1; i >= 0; i--)
+            if (listeners[i].Callback == listener)
+            {
+                listeners.RemoveAt(i);
+                return;
+            }
+    }
+
+    /// <summary>
+    /// Unsubscribes the callback that was previously registered by <see cref="AddOneTimeListener(EventHandler)"/>.
+    /// </summary>
+    /// <param name="listener">The callback that was previously registered by <see cref="AddOneTimeListener(EventHandler)"/></param>
+    public void RemoveOneTimeListener(EventHandler listener)
+    {
+        for (int i = 0; i < onceListeners.Count; i++)
+            if (onceListeners[i].Callback == listener)
+            {
+                onceListeners.RemoveAt(i);
+                return;
+            }
+    }
+
+    /// <summary>
+    /// Unsubscribes all listeners that was previously registered by either <see cref="AddListener(EventHandler)"/> or <see cref="AddOneTimeListener(EventHandler)"/>.
+    /// </summary>
     public void Clear() { listeners.Clear(); onceListeners.Clear(); }
+
+    /// <summary>
+    /// Triggers the event.
+    /// </summary>
     public void Invoke()
     {
-        for (int i = 0; i < listeners.Count; i++)
+        for (int i = listeners.Count - 1; i >= 0; i--)
-            try { listeners[i].Invoke(); }
+            try { listeners[i].Callback.Invoke(); }
             catch (Exception exception)
             {
-                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}()";
+                string methodCallRepresentation = $"{listeners[i].Callback.Method.DeclaringType?.FullName}.{listeners[i].Callback.Method.Name}()";
-                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+                EventHelpers.LogInvocationException(listeners[i].Callback.Target ?? this, Logger, exception, methodCallRepresentation);
             }
 
         for (int i = onceListeners.Count - 1; i >= 0; i--)
         {
-            try { onceListeners[i].Invoke(); }
+            try { onceListeners[i].Callback.Invoke(); }
             catch (Exception exception)
             {
-                string methodCallRepresentation = $"{onceListeners[i].Method.DeclaringType?.FullName}.{onceListeners[i].Method.Name}()";
+                string methodCallRepresentation = $"{onceListeners[i].Callback.Method.DeclaringType?.FullName}.{onceListeners[i].Callback.Method.Name}()";
-                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+                EventHelpers.LogInvocationException(onceListeners[i].Callback.Target ?? this, Logger, exception, methodCallRepresentation);
             }
             onceListeners.RemoveAt(i);
         }
@@ -48,35 +159,148 @@ public class Event
     }
 
     public delegate void EventHandler();
+    private record struct ListenerData(EventHandler Callback, int Priority);
 }
 
-public class Event<TSender>
+/// <summary>
+/// Represents an event with only sender parameters.
+/// <para>Example usage:</para> 
+/// <code>
+/// public class MyBehaviour : Behaviour, IUpdate
+/// {
+///     public readonly Event&lt;MyBehaviour&gt; MyEvent = new();
+/// 
+///     public MyBehaviour()
+///     {
+///         MyEvent.AddListener(OnEventTriggered);
+///         MyEvent.AddOneTimeListener(OnEventTriggeredOneTime);
+///     }
+/// 
+///     public void Update()
+///     {
+///         MyEvent.Invoke(this);
+///     }
+/// 
+///     private void OnEventTriggered(MyBehaviour sender)
+///     {
+///         Console.WriteLine($"{sender.Id}'s event occurred!");
+///     }
+/// 
+///     private static void OnEventTriggeredOneTime(MyBehaviour sender)
+///     {
+///         Console.WriteLine($"{sender.Id}'s event called once!");
+///     }
+/// }
+/// </code>
+/// The output of the example code above would be: 
+/// <code>
+/// [Id]'s event occurred!
+/// [Id]'s event called once!
+/// [Id]'s event occurred!
+/// [Id]'s event occurred!
+/// [Id]'s event occurred!
+/// ...
+/// </code>
+/// 
+/// </summary>
+/// <typeparam name="TSender">Sender type</typeparam>
+public class Event<TSender> where TSender : class
 {
-    private readonly List<EventHandler> listeners = null!;
+    // We use Ascending order because draw calls are running from last to first
-    private readonly List<EventHandler> onceListeners = null!;
+    private static readonly Comparer<ListenerData> SortByAscendingPriority = Comparer<ListenerData>.Create((x, y) => x.Priority.CompareTo(y.Priority));
 
-    public void AddListener(EventHandler listener) => listeners.Add(listener);
+    private ILogger _logger = ILogger.Shared;
-    public void AddOnceListener(EventHandler listener) => onceListeners.Add(listener);
+    public ILogger Logger { get => _logger; set => _logger = value ?? ILogger.Shared; }
-    public void RemoveListener(EventHandler listener) => listeners.Remove(listener);
+
-    public void RemoveOnceListener(EventHandler listener) => onceListeners.Remove(listener);
+    private readonly List<ListenerData> listeners = null!;
+    private readonly List<ListenerData> onceListeners = null!;
+
+    /// <summary>
+    /// Subscribes the callback to be invoked whenever the event is triggered.
+    /// </summary>
+    /// <param name="listener">The callback to be called when the event is triggered.</param>
+    /// <param name="priority">Priority of the callback.</param>
+    public void AddListener(EventHandler listener, int priority = 0)
+    {
+        ListenerData listenerData = new(listener, priority);
+
+        int insertIndex = listeners.BinarySearch(listenerData, SortByAscendingPriority);
+        if (insertIndex < 0)
+            insertIndex = ~insertIndex;
+
+        listeners.Insert(insertIndex, listenerData);
+    }
+
+    /// <summary>
+    /// Subscribes the callback to be invoked the next time the event is triggered. The callback will be called only once.
+    /// </summary>
+    /// <param name="listener">The callback to be called the next time the event is triggered.</param>
+    /// <param name="priority">Priority of the callback.</param>
+    public void AddOneTimeListener(EventHandler listener, int priority = 0)
+    {
+        ListenerData listenerData = new(listener, priority);
+
+        int insertIndex = onceListeners.BinarySearch(listenerData, SortByAscendingPriority);
+        if (insertIndex < 0)
+            insertIndex = ~insertIndex;
+
+        onceListeners.Insert(insertIndex, listenerData);
+    }
+
+    /// <summary>
+    /// Unsubscribes the callback that was previously registered by <see cref="AddListener(EventHandler)"/>.
+    /// </summary>
+    /// <param name="listener">The callback that was previously registered by <see cref="AddListener(EventHandler)"/></param>
+    public void RemoveListener(EventHandler listener)
+    {
+        for (int i = listeners.Count - 1; i >= 0; i--)
+            if (listeners[i].Callback == listener)
+            {
+                listeners.RemoveAt(i);
+                return;
+            }
+    }
+
+    /// <summary>
+    /// Unsubscribes the callback that was previously registered by <see cref="AddOneTimeListener(EventHandler)"/>.
+    /// </summary>
+    /// <param name="listener">The callback that was previously registered by <see cref="AddOneTimeListener(EventHandler)"/></param>
+    public void RemoveOneTimeListener(EventHandler listener)
+    {
+        for (int i = 0; i < onceListeners.Count; i++)
+            if (onceListeners[i].Callback == listener)
+            {
+                onceListeners.RemoveAt(i);
+                return;
+            }
+    }
+
+    /// <summary>
+    /// Unsubscribes all listeners that was previously registered by either <see cref="AddListener(EventHandler)"/> or <see cref="AddOneTimeListener(EventHandler)"/>.
+    /// </summary>
     public void Clear() { listeners.Clear(); onceListeners.Clear(); }
+
+    /// <summary>
+    /// Triggers the event.
+    /// </summary>
+    /// <param name="sender">The caller that's triggering this event.</param>
     public void Invoke(TSender sender)
     {
-        for (int i = 0; i < listeners.Count; i++)
+        for (int i = listeners.Count - 1; i >= 0; i--)
-            try { listeners[i].Invoke(sender); }
+            try { listeners[i].Callback.Invoke(sender); }
             catch (Exception exception)
             {
-                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}({sender})";
+                string methodCallRepresentation = $"{listeners[i].Callback.Method.DeclaringType?.FullName}.{listeners[i].Callback.Method.Name}({sender})";
-                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+                EventHelpers.LogInvocationException(listeners[i].Callback.Target ?? sender, Logger, exception, methodCallRepresentation);
             }
 
         for (int i = onceListeners.Count - 1; i >= 0; i--)
         {
-            try { onceListeners[i].Invoke(sender); }
+            try { onceListeners[i].Callback.Invoke(sender); }
             catch (Exception exception)
             {
-                string methodCallRepresentation = $"{onceListeners[i].Method.DeclaringType?.FullName}.{onceListeners[i].Method.Name}({sender})";
+                string methodCallRepresentation = $"{onceListeners[i].Callback.Method.DeclaringType?.FullName}.{onceListeners[i].Callback.Method.Name}({sender})";
-                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+                EventHelpers.LogInvocationException(onceListeners[i].Callback.Target ?? sender, Logger, exception, methodCallRepresentation);
             }
             onceListeners.RemoveAt(i);
         }
@@ -95,35 +319,156 @@ public class Event<TSender>
     }
 
     public delegate void EventHandler(TSender sender);
+    private record struct ListenerData(EventHandler Callback, int Priority);
 }
 
-public class Event<TSender, TArguments>
+/// <summary>
+/// Represents an event with sender and argument parameters.
+/// <para>Example usage:</para> 
+/// <code>
+/// public class MyBehaviour : Behaviour, IUpdate
+/// {
+///     public readonly Event&lt;MyBehaviour, MyArguments&gt; MyEvent = new();
+/// 
+///     private int myInt = 0;
+///     private bool myBool = false;
+/// 
+///     public MyBehaviour()
+///     {
+///         MyEvent.AddOneTimeListener(OnEventTriggeredOneTime);
+///         MyEvent.AddListener(OnEventTriggered);
+///     }
+/// 
+///     public void Update()
+///     {
+///         MyEvent.Invoke(this, new MyArguments(myInt, myBool));
+///         myInt++;
+///         myBool = !myBool;
+///     }
+/// 
+///     private void OnEventTriggered(MyBehaviour sender, MyArguments args)
+///     {
+///         Console.WriteLine($"{sender.Id}'s event occurred with MyInt: {args.MyInt} and MyBool {args.MyBool}!");
+///     }
+/// 
+///     private static void OnEventTriggeredOneTime(MyBehaviour sender, MyArguments args)
+///     {
+///         Console.WriteLine($"{sender.Id}'s event called once with MyInt: {args.MyInt} and MyBool {args.MyBool}!");
+///     }
+/// 
+///     public readonly record struct MyArguments(int MyInt, bool MyBool);
+/// }
+/// </code>
+/// The output of the example code above would be: 
+/// <code>
+/// [Id]'s event occurred with MyInt: 0 and MyBool False!
+/// [Id]'s event called once with MyInt: 0 and MyBool False!
+/// [Id]'s event occurred with MyInt: 1 and MyBool True!
+/// [Id]'s event occurred with MyInt: 2 and MyBool False!
+/// [Id]'s event occurred with MyInt: 3 and MyBool True!
+/// ...
+/// </code>
+/// 
+/// </summary>
+/// <typeparam name="TSender">Sender type</typeparam>
+public class Event<TSender, TArguments> where TSender : class
 {
-    private readonly List<EventHandler> listeners = null!;
+    // We use Ascending order because draw calls are running from last to first
-    private readonly List<EventHandler> onceListeners = null!;
+    private static readonly Comparer<ListenerData> SortByAscendingPriority = Comparer<ListenerData>.Create((x, y) => x.Priority.CompareTo(y.Priority));
 
-    public void AddListener(EventHandler listener) => listeners.Add(listener);
+    private ILogger _logger = ILogger.Shared;
-    public void AddOnceListener(EventHandler listener) => onceListeners.Add(listener);
+    public ILogger Logger { get => _logger; set => _logger = value ?? ILogger.Shared; }
-    public void RemoveListener(EventHandler listener) => listeners.Remove(listener);
+
-    public void RemoveOnceListener(EventHandler listener) => onceListeners.Remove(listener);
+    private readonly List<ListenerData> listeners = null!;
+    private readonly List<ListenerData> onceListeners = null!;
+
+    /// <summary>
+    /// Subscribes the callback to be invoked whenever the event is triggered.
+    /// </summary>
+    /// <param name="listener">The callback to be called when the event is triggered.</param>
+    /// <param name="priority">Priority of the callback.</param>
+    public void AddListener(EventHandler listener, int priority = 0)
+    {
+        ListenerData listenerData = new(listener, priority);
+
+        int insertIndex = listeners.BinarySearch(listenerData, SortByAscendingPriority);
+        if (insertIndex < 0)
+            insertIndex = ~insertIndex;
+
+        listeners.Insert(insertIndex, listenerData);
+    }
+
+    /// <summary>
+    /// Subscribes the callback to be invoked the next time the event is triggered. The callback will be called only once.
+    /// </summary>
+    /// <param name="listener">The callback to be called the next time the event is triggered.</param>
+    /// <param name="priority">Priority of the callback.</param>
+    public void AddOneTimeListener(EventHandler listener, int priority = 0)
+    {
+        ListenerData listenerData = new(listener, priority);
+
+        int insertIndex = onceListeners.BinarySearch(listenerData, SortByAscendingPriority);
+        if (insertIndex < 0)
+            insertIndex = ~insertIndex;
+
+        onceListeners.Insert(insertIndex, listenerData);
+    }
+
+    /// <summary>
+    /// Unsubscribes the callback that was previously registered by <see cref="AddListener(EventHandler)"/>.
+    /// </summary>
+    /// <param name="listener">The callback that was previously registered by <see cref="AddListener(EventHandler)"/></param>
+    public void RemoveListener(EventHandler listener)
+    {
+        for (int i = listeners.Count - 1; i >= 0; i--)
+            if (listeners[i].Callback == listener)
+            {
+                listeners.RemoveAt(i);
+                return;
+            }
+    }
+
+    /// <summary>
+    /// Unsubscribes the callback that was previously registered by <see cref="AddOneTimeListener(EventHandler)"/>.
+    /// </summary>
+    /// <param name="listener">The callback that was previously registered by <see cref="AddOneTimeListener(EventHandler)"/></param>
+    public void RemoveOneTimeListener(EventHandler listener)
+    {
+        for (int i = 0; i < onceListeners.Count; i++)
+            if (onceListeners[i].Callback == listener)
+            {
+                onceListeners.RemoveAt(i);
+                return;
+            }
+    }
+
+    /// <summary>
+    /// Unsubscribes all listeners that was previously registered by either <see cref="AddListener(EventHandler)"/> or <see cref="AddOneTimeListener(EventHandler)"/>.
+    /// </summary>
     public void Clear() { listeners.Clear(); onceListeners.Clear(); }
+
+    /// <summary>
+    /// Triggers the event.
+    /// </summary>
+    /// <param name="sender">The caller that's triggering this event.</param>
+    /// <param name="args">The arguments provided for this event.</param>
     public void Invoke(TSender sender, TArguments args)
     {
-        for (int i = 0; i < listeners.Count; i++)
+        for (int i = listeners.Count - 1; i >= 0; i--)
-            try { listeners[i].Invoke(sender, args); }
+            try { listeners[i].Callback.Invoke(sender, args); }
             catch (Exception exception)
             {
-                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}({string.Join(", ", sender, args)})";
+                string methodCallRepresentation = $"{listeners[i].Callback.Method.DeclaringType?.FullName}.{listeners[i].Callback.Method.Name}({sender}, {args})";
-                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+                EventHelpers.LogInvocationException(listeners[i].Callback.Target ?? sender, Logger, exception, methodCallRepresentation);
             }
 
         for (int i = onceListeners.Count - 1; i >= 0; i--)
         {
-            try { onceListeners[i].Invoke(sender, args); }
+            try { onceListeners[i].Callback.Invoke(sender, args); }
             catch (Exception exception)
             {
-                string methodCallRepresentation = $"{onceListeners[i].Method.DeclaringType?.FullName}.{onceListeners[i].Method.Name}({string.Join(", ", sender, args)})";
+                string methodCallRepresentation = $"{onceListeners[i].Callback.Method.DeclaringType?.FullName}.{onceListeners[i].Callback.Method.Name}({sender}, {args})";
-                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+                EventHelpers.LogInvocationException(onceListeners[i].Callback.Target ?? sender, Logger, exception, methodCallRepresentation);
             }
             onceListeners.RemoveAt(i);
         }
@@ -142,4 +487,14 @@ public class Event<TSender, TArguments>
     }
 
     public delegate void EventHandler(TSender sender, TArguments args);
+    private record struct ListenerData(EventHandler Callback, int Priority);
+}
+
+internal static class EventHelpers
+{
+    public static void LogInvocationException(object sender, ILogger logger, Exception exception, string methodCallRepresentation)
+    {
+        logger.LogException(sender, exception);
+        logger.LogError(sender, $"Unexpected exception on invocation of method {methodCallRepresentation}");
+    }
 }

Engine.Core/Helpers/ListPool.cs

@@ -31,10 +31,10 @@ public class ListPool<T> : IPool<List<T>>
         OnReturned?.Invoke(this, list);
     }
 
-    public ListPool(Func<List<T>> generator, int initialCapacity = 1)
+    public ListPool(int initialListCount = 1, int initialListCapacity = 32)
     {
-        this.generator = generator;
+        generator = () => new(initialListCapacity);
-        for (int i = 0; i < initialCapacity; i++)
+        for (int i = 0; i < initialListCount; i++)
             queue.Enqueue(generator());
     }
 }

Engine.Core/Math.cs

@@ -6,29 +6,29 @@ namespace Syntriax.Engine.Core;
 public static class Math
 {
     /// <summary>
-    /// The value of Pi (π), a mathematical constant approximately equal to 3.14159.
+    /// The value of Pi (π).
     /// </summary>
-    public const float PI = 3.1415926535897932f;
+    public const float Pi = 3.1415926535897932f;
 
     /// <summary>
-    /// The value of Tau (τ), a mathematical constant equal to 2π, approximately equal to 6.28319.
+    /// The value of Tau (τ), mathematical constant equal to 2π.
     /// </summary>
-    public const float Tau = 2f * PI;
+    public const float Tau = 2f * Pi;
 
     /// <summary>
-    /// The base of the natural logarithm, approximately equal to 2.71828.
+    /// The base of the natural logarithm.
     /// </summary>
     public const float E = 2.718281828459045f;
 
     /// <summary>
     /// The conversion factor from radians to degrees.
     /// </summary>
-    public const float RadianToDegree = 180f / PI;
+    public const float RadianToDegree = 180f / Pi;
 
     /// <summary>
     /// The conversion factor from degrees to radians.
     /// </summary>
-    public const float DegreeToRadian = PI / 180f;
+    public const float DegreeToRadian = Pi / 180f;
 
     /// <summary>
     /// Gets one minus of given <see cref="T"/>.

Engine.Core/Primitives/AABB.cs

@@ -38,6 +38,9 @@ public readonly struct AABB(Vector2D lowerBoundary, Vector2D upperBoundary)
     /// </summary>
     public readonly Vector2D SizeHalf => Size * .5f;
 
+    public static bool operator ==(AABB left, AABB right) => left.UpperBoundary == right.UpperBoundary && left.LowerBoundary == right.LowerBoundary;
+    public static bool operator !=(AABB left, AABB right) => left.UpperBoundary != right.UpperBoundary || left.LowerBoundary != right.LowerBoundary;
+
     /// <summary>
     /// Creates an <see cref="AABB"/> from a collection of <see cref="Vector2D"/>s.
     /// </summary>
@@ -63,12 +66,6 @@ public readonly struct AABB(Vector2D lowerBoundary, Vector2D upperBoundary)
         return new(lowerBoundary, upperBoundary);
     }
 
-    /// <summary>
-    /// Converts the <see cref="AABB"/> to its string representation.
-    /// </summary>
-    /// <returns>A string representation of the <see cref="AABB"/>.</returns>
-    public override string ToString() => $"{nameof(AABB)}({LowerBoundary}, {UpperBoundary})";
-
     /// <summary>
     /// Checks if two <see cref="AABB"/>s are approximately equal.
     /// </summary>
@@ -78,6 +75,25 @@ public readonly struct AABB(Vector2D lowerBoundary, Vector2D upperBoundary)
     /// <returns><see cref="true"/> if the <see cref="AABB"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
     public static bool ApproximatelyEquals(AABB left, AABB right, float epsilon = float.Epsilon)
         => left.LowerBoundary.ApproximatelyEquals(right.LowerBoundary, epsilon) && left.UpperBoundary.ApproximatelyEquals(right.UpperBoundary, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="AABB"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="AABB"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="AABB"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is AABB aabb && this == aabb;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="AABB"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="AABB"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(LowerBoundary, UpperBoundary);
+
+    /// <summary>
+    /// Converts the <see cref="AABB"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="AABB"/>.</returns>
+    public override string ToString() => $"{nameof(AABB)}({LowerBoundary}, {UpperBoundary})";
 }
 
 /// <summary>

Engine.Core/Primitives/Circle.cs

@@ -38,6 +38,9 @@ public readonly struct Circle(Vector2D center, float radius)
     /// </summary>
     public static readonly Circle UnitCircle = new(Vector2D.Zero, 1f);
 
+    public static bool operator ==(Circle left, Circle right) => left.Center == right.Center && left.Radius == right.Radius;
+    public static bool operator !=(Circle left, Circle right) => left.Center != right.Center || left.Radius != right.Radius;
+
     /// <summary>
     /// Sets the center of the <see cref="Circle"/>.
     /// </summary>
@@ -77,6 +80,25 @@ public readonly struct Circle(Vector2D center, float radius)
     /// <returns><see cref="true"/> if the <see cref="Circle"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
     public static bool ApproximatelyEquals(Circle left, Circle right, float epsilon = float.Epsilon)
         => left.Center.ApproximatelyEquals(right.Center, epsilon) && left.Radius.ApproximatelyEquals(right.Radius, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Circle"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Circle"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Circle"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Circle circle && this == circle;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Circle"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Circle"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(Center, Radius);
+
+    /// <summary>
+    /// Converts the <see cref="Circle"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Circle"/>.</returns>
+    public override string ToString() => $"{nameof(Circle)}({Center}, {Radius})";
 }
 
 /// <summary>

Engine.Core/Primitives/ColorHSV.cs

@@ -27,49 +27,19 @@ public readonly struct ColorHSV(float hue, float saturation, float value)
     /// </summary>
     public readonly float Value = value.Clamp(0f, 1f);
 
-    public static ColorHSV operator -(ColorHSV color) => new(color.Hue.OneMinus().Clamp(0f, 1f), color.Saturation.OneMinus().Clamp(0f, 1f), color.Value.OneMinus().Clamp(0f, 1f));
+    public static ColorHSV operator -(ColorHSV color) => new(color.Hue.OneMinus(), color.Saturation.OneMinus(), color.Value.OneMinus());
-    public static ColorHSV operator +(ColorHSV left, ColorHSV right) => new((left.Hue + right.Hue).Clamp(0f, 1f), (left.Saturation + right.Saturation).Clamp(0f, 1f), (left.Value + right.Value).Clamp(0f, 1f));
+    public static ColorHSV operator +(ColorHSV left, ColorHSV right) => new(left.Hue + right.Hue, left.Saturation + right.Saturation, left.Value + right.Value);
-    public static ColorHSV operator -(ColorHSV left, ColorHSV right) => new((left.Hue - right.Hue).Clamp(0f, 1f), (left.Saturation - right.Saturation).Clamp(0f, 1f), (left.Value - right.Value).Clamp(0f, 1f));
+    public static ColorHSV operator -(ColorHSV left, ColorHSV right) => new(left.Hue - right.Hue, left.Saturation - right.Saturation, left.Value - right.Value);
-    public static ColorHSV operator *(ColorHSV left, ColorHSV right) => new((left.Hue * right.Hue).Clamp(0f, 1f), (left.Saturation * right.Saturation).Clamp(0f, 1f), (left.Value * right.Value).Clamp(0f, 1f));
+    public static ColorHSV operator *(ColorHSV left, ColorHSV right) => new(left.Hue * right.Hue, left.Saturation * right.Saturation, left.Value * right.Value);
-    public static ColorHSV operator *(ColorHSV color, float value) => new((color.Hue * value).Clamp(0f, 1f), (color.Saturation * value).Clamp(0f, 1f), (color.Value * value).Clamp(0f, 1f));
+    public static ColorHSV operator *(ColorHSV color, float value) => new(color.Hue * value, color.Saturation * value, color.Value * value);
-    public static ColorHSV operator *(float value, ColorHSV color) => new((color.Hue * value).Clamp(0f, 1f), (color.Saturation * value).Clamp(0f, 1f), (color.Value * value).Clamp(0f, 1f));
+    public static ColorHSV operator *(float value, ColorHSV color) => new(color.Hue * value, color.Saturation * value, color.Value * value);
-    public static ColorHSV operator /(ColorHSV color, float value) => new((color.Hue / value).Clamp(0f, 1f), (color.Saturation / value).Clamp(0f, 1f), (color.Value / value).Clamp(0f, 1f));
+    public static ColorHSV operator /(ColorHSV color, float value) => new(color.Hue / value, color.Saturation / value, color.Value / value);
-    public static bool operator ==(ColorHSV left, ColorHSV right) => left.Hue.ApproximatelyEquals(right.Hue) && left.Saturation.ApproximatelyEquals(right.Saturation) && left.Value.ApproximatelyEquals(right.Value);
+    public static bool operator ==(ColorHSV left, ColorHSV right) => left.Hue == right.Hue && left.Saturation == right.Saturation && left.Value == right.Value;
-    public static bool operator !=(ColorHSV left, ColorHSV right) => !left.Hue.ApproximatelyEquals(right.Hue) || !left.Saturation.ApproximatelyEquals(right.Saturation) || !left.Value.ApproximatelyEquals(right.Value);
+    public static bool operator !=(ColorHSV left, ColorHSV right) => left.Hue != right.Hue || left.Saturation != right.Saturation || left.Value != right.Value;
 
-    public static implicit operator ColorHSV(ColorRGBA rgba) => (ColorRGB)rgba;
+    public static implicit operator ColorHSV(ColorHSVA hsva) => new(hsva.Hue, hsva.Saturation, hsva.Value);
-    public static implicit operator ColorHSV(ColorRGB rgb)
+    public static implicit operator ColorHSV(ColorRGBA rgba) => (ColorHSVA)rgba;
-    {
+    public static implicit operator ColorHSV(ColorRGB rgb) => (ColorHSVA)rgb;
-        float hue;
-        float saturation;
-        float value;
-
-        float rd = rgb.R / 255f;
-        float gd = rgb.G / 255f;
-        float bd = rgb.B / 255f;
-
-        float max = Math.Max(rd, Math.Max(gd, bd));
-        float min = Math.Min(rd, Math.Min(gd, bd));
-        float delta = max - min;
-
-        if (delta.ApproximatelyEquals(0))
-            hue = 0f;
-        else if (max.ApproximatelyEquals(rd))
-            hue = 60f * ((gd - bd) / delta % 6f);
-        else if (max.ApproximatelyEquals(gd))
-            hue = 60f * (((bd - rd) / delta) + 2f);
-        else
-            hue = 60f * (((rd - gd) / delta) + 4f);
-
-        if (hue < 0f)
-            hue += 360f;
-
-        hue /= 360f;
-        saturation = max.ApproximatelyEquals(0f) ? 0f : delta / max;
-        value = max;
-
-        return new(hue, saturation, value);
-    }
 
     /// <summary>
     /// Inverts the given <see cref="ColorHSV"/>.
@@ -110,14 +80,6 @@ public readonly struct ColorHSV(float hue, float saturation, float value)
     /// <returns>The result of dividing the <see cref="ColorHSV"/> by the scalar value.</returns>
     public static ColorHSV Divide(ColorHSV color, float value) => color / value;
 
-    /// <summary>
-    /// Calculates the <see cref="ColorHSV"/> from one point to another.
-    /// </summary>
-    /// <param name="from">The starting point.</param>
-    /// <param name="to">The ending point.</param>
-    /// <returns>The <see cref="ColorHSV"/> from the starting point to the ending point.</returns>
-    public static ColorHSV FromTo(ColorHSV from, ColorHSV to) => to - from;
-
     /// <summary>
     /// Performs linear interpolation between two <see cref="ColorHSV"/>s.
     /// </summary>
@@ -125,13 +87,14 @@ public readonly struct ColorHSV(float hue, float saturation, float value)
     /// <param name="to">The ending <see cref="ColorHSV"/> (t = 1).</param>
     /// <param name="t">The interpolation parameter.</param>
     /// <returns>The interpolated <see cref="ColorHSV"/>.</returns>
-    public static ColorHSV Lerp(ColorHSV from, ColorHSV to, float t) => from + FromTo(from, to) * t;
+    public static ColorHSV Lerp(ColorHSV from, ColorHSV to, float t)
+    {
+        float hueDiff = to.Hue - from.Hue;
+        float saturationDiff = to.Saturation - from.Saturation;
+        float valueDiff = to.Value - from.Value;
 
-    /// <summary>
+        return from + new ColorHSV(hueDiff * t, saturationDiff * t, valueDiff * t);
-    /// Converts the <see cref="ColorHSV"/> to its string representation.
+    }
-    /// </summary>
-    /// <returns>A string representation of the <see cref="ColorHSV"/>.</returns>
-    public override string ToString() => $"{nameof(ColorHSV)}({Hue}, {Saturation}, {Value})";
 
     /// <summary>
     /// Checks if two <see cref="ColorHSV"/>s are approximately equal within a specified epsilon range.
@@ -148,13 +111,19 @@ public readonly struct ColorHSV(float hue, float saturation, float value)
     /// </summary>
     /// <param name="obj">The object to compare with the current <see cref="ColorHSV"/>.</param>
     /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="ColorHSV"/>; otherwise, <see cref="false"/>.</returns>
-    public override bool Equals(object? obj) => obj is ColorHSV objVec && Hue.Equals(objVec.Hue) && Saturation.Equals(objVec.Saturation) && Value.Equals(objVec.Value);
+    public override bool Equals(object? obj) => obj is ColorHSV colorHSV && this == colorHSV;
 
     /// <summary>
     /// Generates a hash code for the <see cref="ColorHSV"/>.
     /// </summary>
     /// <returns>A hash code for the <see cref="ColorHSV"/>.</returns>
     public override int GetHashCode() => System.HashCode.Combine(Hue, Saturation, Value);
+
+    /// <summary>
+    /// Converts the <see cref="ColorHSV"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="ColorHSV"/>.</returns>
+    public override string ToString() => $"{nameof(ColorHSV)}({Hue}, {Saturation}, {Value})";
 }
 
 /// <summary>
@@ -174,9 +143,6 @@ public static class ColorHSVExtensions
     /// <inheritdoc cref="ColorHSV.Divide(ColorHSV, ColorHSV)" />
     public static ColorHSV Divide(this ColorHSV color, float value) => ColorHSV.Divide(color, value);
 
-    /// <inheritdoc cref="ColorHSV.FromTo(ColorHSV, ColorHSV)" />
-    public static ColorHSV FromTo(this ColorHSV from, ColorHSV to) => ColorHSV.FromTo(from, to);
-
     /// <inheritdoc cref="ColorHSV.Lerp(ColorHSV, ColorHSV, float)" />
     public static ColorHSV Lerp(this ColorHSV from, ColorHSV to, float t) => ColorHSV.Lerp(from, to, t);
 

Engine.Core/Primitives/ColorHSVA.cs

@@ -0,0 +1,189 @@
+namespace Syntriax.Engine.Core;
+
+/// <summary>
+/// Represents an HSV color.
+/// </summary>
+/// <param name="hue">Hue of the <see cref="ColorHSVA"/>.</param>
+/// <param name="saturation">Saturation of the <see cref="ColorHSVA"/>.</param>
+/// <param name="value">Value of the <see cref="ColorHSVA"/>.</param>
+/// <param name="alpha">Alpha of the <see cref="ColorHSVA"/>.</param>
+/// <remarks>
+/// Initializes a new instance of the <see cref="ColorHSVA"/> struct with the specified values.
+/// </remarks>
+[System.Diagnostics.DebuggerDisplay("{ToString(),nq}")]
+public readonly struct ColorHSVA(float hue, float saturation, float value, float alpha = 1)
+{
+    /// <summary>
+    /// The Hue value of the <see cref="ColorHSVA"/>.
+    /// </summary>
+    public readonly float Hue = hue.Clamp(0f, 1f);
+
+    /// <summary>
+    /// The Saturation value of the <see cref="ColorHSVA"/>.
+    /// </summary>
+    public readonly float Saturation = saturation.Clamp(0f, 1f);
+
+    /// <summary>
+    /// The Value value of the <see cref="ColorHSVA"/>.
+    /// </summary>
+    public readonly float Value = value.Clamp(0f, 1f);
+
+    /// <summary>
+    /// The Alpha value of the <see cref="ColorHSVA"/>.
+    /// </summary>
+    public readonly float Alpha = alpha;
+
+    public static ColorHSVA operator -(ColorHSVA color) => new(color.Hue.OneMinus(), color.Saturation.OneMinus(), color.Value.OneMinus(), color.Alpha);
+    public static ColorHSVA operator +(ColorHSVA left, ColorHSVA right) => new(left.Hue + right.Hue, left.Saturation + right.Saturation, left.Value + right.Value, left.Alpha + right.Alpha);
+    public static ColorHSVA operator -(ColorHSVA left, ColorHSVA right) => new(left.Hue - right.Hue, left.Saturation - right.Saturation, left.Value - right.Value, left.Alpha - right.Alpha);
+    public static ColorHSVA operator *(ColorHSVA left, ColorHSVA right) => new(left.Hue * right.Hue, left.Saturation * right.Saturation, left.Value * right.Value, left.Alpha * right.Alpha);
+    public static ColorHSVA operator *(ColorHSVA color, float value) => new(color.Hue * value, color.Saturation * value, color.Value * value, color.Alpha * value);
+    public static ColorHSVA operator *(float value, ColorHSVA color) => new(color.Hue * value, color.Saturation * value, color.Value * value, color.Alpha * value);
+    public static ColorHSVA operator /(ColorHSVA color, float value) => new(color.Hue / value, color.Saturation / value, color.Value / value, color.Alpha / value);
+    public static bool operator ==(ColorHSVA left, ColorHSVA right) => left.Hue == right.Hue && left.Saturation == right.Saturation && left.Value == right.Value;
+    public static bool operator !=(ColorHSVA left, ColorHSVA right) => left.Hue != right.Hue || left.Saturation != right.Saturation || left.Value != right.Value;
+
+    public static implicit operator ColorHSVA(ColorHSV hsv) => new(hsv.Hue, hsv.Saturation, hsv.Value, 1f);
+    public static implicit operator ColorHSVA(ColorRGB rgb) => (ColorRGBA)rgb;
+    public static implicit operator ColorHSVA(ColorRGBA rgba)
+    {
+        float hue;
+        float saturation;
+        float value;
+
+        float rd = rgba.R / 255f;
+        float gd = rgba.G / 255f;
+        float bd = rgba.B / 255f;
+
+        float max = Math.Max(rd, Math.Max(gd, bd));
+        float min = Math.Min(rd, Math.Min(gd, bd));
+        float delta = max - min;
+
+        if (delta.ApproximatelyEquals(0))
+            hue = 0f;
+        else if (max.ApproximatelyEquals(rd))
+            hue = 60f * ((gd - bd) / delta % 6f);
+        else if (max.ApproximatelyEquals(gd))
+            hue = 60f * (((bd - rd) / delta) + 2f);
+        else
+            hue = 60f * (((rd - gd) / delta) + 4f);
+
+        if (hue < 0f)
+            hue += 360f;
+
+        hue /= 360f;
+        saturation = max.ApproximatelyEquals(0f) ? 0f : delta / max;
+        value = max;
+
+        return new(hue, saturation, value, rgba.A / 255f);
+    }
+
+    /// <summary>
+    /// Inverts the given <see cref="ColorHSVA"/>.
+    /// </summary>
+    /// <param name="color">The <see cref="ColorHSVA"/>.</param>
+    /// <returns>The inverted <see cref="ColorHSVA"/>.</returns>
+    public static ColorHSVA Invert(ColorHSVA color) => -color;
+
+    /// <summary>
+    /// Adds two <see cref="ColorHSVA"/>s.
+    /// </summary>
+    /// <param name="left">The first <see cref="ColorHSVA"/>.</param>
+    /// <param name="right">The second <see cref="ColorHSVA"/>.</param>
+    /// <returns>The sum of the two <see cref="ColorHSVA"/>s.</returns>
+    public static ColorHSVA Add(ColorHSVA left, ColorHSVA right) => left + right;
+
+    /// <summary>
+    /// Subtracts one <see cref="ColorHSVA"/> from another.
+    /// </summary>
+    /// <param name="left">The <see cref="ColorHSVA"/> to subtract from.</param>
+    /// <param name="right">The <see cref="ColorHSVA"/> to subtract.</param>
+    /// <returns>The result of subtracting the second <see cref="ColorHSVA"/> from the first.</returns>
+    public static ColorHSVA Subtract(ColorHSVA left, ColorHSVA right) => left - right;
+
+    /// <summary>
+    /// Multiplies a <see cref="ColorHSVA"/> by a scalar value.
+    /// </summary>
+    /// <param name="color">The <see cref="ColorHSVA"/>.</param>
+    /// <param name="value">The scalar value.</param>
+    /// <returns>The result of multiplying the <see cref="ColorHSVA"/> by the scalar value.</returns>
+    public static ColorHSVA Multiply(ColorHSVA color, float value) => color * value;
+
+    /// <summary>
+    /// Divides a <see cref="ColorHSVA"/> by a scalar value.
+    /// </summary>
+    /// <param name="color">The <see cref="ColorHSVA"/>.</param>
+    /// <param name="value">The scalar value.</param>
+    /// <returns>The result of dividing the <see cref="ColorHSVA"/> by the scalar value.</returns>
+    public static ColorHSVA Divide(ColorHSVA color, float value) => color / value;
+
+    /// <summary>
+    /// Performs linear interpolation between two <see cref="ColorHSVA"/>s.
+    /// </summary>
+    /// <param name="from">The starting <see cref="ColorHSVA"/> (t = 0).</param>
+    /// <param name="to">The ending <see cref="ColorHSVA"/> (t = 1).</param>
+    /// <param name="t">The interpolation parameter.</param>
+    /// <returns>The interpolated <see cref="ColorHSVA"/>.</returns>
+    public static ColorHSVA Lerp(ColorHSVA from, ColorHSVA to, float t)
+    {
+        float hueDiff = to.Hue - from.Hue;
+        float saturationDiff = to.Saturation - from.Saturation;
+        float valueDiff = to.Value - from.Value;
+        float alphaDiff = to.Alpha - from.Alpha;
+
+        return from + new ColorHSVA(hueDiff * t, saturationDiff * t, valueDiff * t, alphaDiff * t);
+    }
+
+    /// <summary>
+    /// Checks if two <see cref="ColorHSVA"/>s are approximately equal within a specified epsilon range.
+    /// </summary>
+    /// <param name="left">The first <see cref="ColorHSVA"/>.</param>
+    /// <param name="right">The second <see cref="ColorHSVA"/>.</param>
+    /// <param name="epsilon">The epsilon range.</param>
+    /// <returns><see cref="true"/> if the <see cref="ColorHSVA"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
+    public static bool ApproximatelyEquals(ColorHSVA left, ColorHSVA right, float epsilon = float.Epsilon)
+        => left.Hue.ApproximatelyEquals(right.Hue, epsilon) && left.Saturation.ApproximatelyEquals(right.Saturation, epsilon) && left.Value.ApproximatelyEquals(right.Value, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="ColorHSVA"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="ColorHSVA"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="ColorHSVA"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is ColorHSVA colorHSVA && this == colorHSVA;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="ColorHSVA"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="ColorHSVA"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(Hue, Saturation, Value);
+
+    /// <summary>
+    /// Converts the <see cref="ColorHSVA"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="ColorHSVA"/>.</returns>
+    public override string ToString() => $"{nameof(ColorHSVA)}({Hue}, {Saturation}, {Value})";
+}
+
+/// <summary>
+/// Provides extension methods for <see cref="ColorHSVA"/> type.
+/// </summary>
+public static class ColorHSVAExtensions
+{
+    /// <inheritdoc cref="ColorHSVA.Add(ColorHSVA, ColorHSVA)" />
+    public static ColorHSVA Add(this ColorHSVA color, ColorHSVA value) => ColorHSVA.Add(color, value);
+
+    /// <inheritdoc cref="ColorHSVA.Subtract(ColorHSVA, ColorHSVA)" />
+    public static ColorHSVA Subtract(this ColorHSVA color, ColorHSVA value) => ColorHSVA.Subtract(color, value);
+
+    /// <inheritdoc cref="ColorHSVA.Multiply(ColorHSVA, ColorHSVA)" />
+    public static ColorHSVA Multiply(this ColorHSVA color, float value) => ColorHSVA.Multiply(color, value);
+
+    /// <inheritdoc cref="ColorHSVA.Divide(ColorHSVA, ColorHSVA)" />
+    public static ColorHSVA Divide(this ColorHSVA color, float value) => ColorHSVA.Divide(color, value);
+
+    /// <inheritdoc cref="ColorHSVA.Lerp(ColorHSVA, ColorHSVA, float)" />
+    public static ColorHSVA Lerp(this ColorHSVA from, ColorHSVA to, float t) => ColorHSVA.Lerp(from, to, t);
+
+    /// <inheritdoc cref="ColorHSVA.ApproximatelyEquals(ColorHSVA, ColorHSVA, float) " />
+    public static bool ApproximatelyEquals(this ColorHSVA left, ColorHSVA right, float epsilon = float.Epsilon) => ColorHSVA.ApproximatelyEquals(left, right, epsilon);
+}

Engine.Core/Primitives/ColorRGB.cs

@@ -38,30 +38,8 @@ public readonly struct ColorRGB(byte r, byte g, byte b)
     public static bool operator !=(ColorRGB left, ColorRGB right) => left.R != right.R || left.G != right.G || left.B != right.B;
 
     public static implicit operator ColorRGB(ColorRGBA rgba) => new(rgba.R, rgba.G, rgba.B);
-    public static implicit operator ColorRGB(ColorHSV hsv)
+    public static implicit operator ColorRGB(ColorHSVA hsva) => (ColorRGBA)hsva;
-    {
+    public static implicit operator ColorRGB(ColorHSV hsv) => (ColorRGBA)hsv;
-        float hue = hsv.Hue * 360f;
-        float chroma = hsv.Value * hsv.Saturation;
-        float x = chroma * (1f - Math.Abs(hue / 60f % 2f - 1f));
-        float m = hsv.Value - chroma;
-
-        float r1 = 0f;
-        float g1 = 0f;
-        float b1 = 0f;
-
-        if (hue < 60) { r1 = chroma; g1 = x; b1 = 0; }
-        else if (hue < 120) { r1 = x; g1 = chroma; b1 = 0; }
-        else if (hue < 180) { r1 = 0; g1 = chroma; b1 = x; }
-        else if (hue < 240) { r1 = 0; g1 = x; b1 = chroma; }
-        else if (hue < 300) { r1 = x; g1 = 0; b1 = chroma; }
-        else if (hue <= 360) { r1 = chroma; g1 = 0; b1 = x; }
-
-        byte r = (byte)Math.RoundToInt((r1 + m) * 255);
-        byte g = (byte)Math.RoundToInt((g1 + m) * 255);
-        byte b = (byte)Math.RoundToInt((b1 + m) * 255);
-
-        return new(r, g, b);
-    }
 
     /// <summary>
     /// Inverts the given <see cref="ColorRGB"/>.
@@ -102,14 +80,6 @@ public readonly struct ColorRGB(byte r, byte g, byte b)
     /// <returns>The result of dividing the <see cref="ColorRGB"/> by the scalar value.</returns>
     public static ColorRGB Divide(ColorRGB color, float value) => color / value;
 
-    /// <summary>
-    /// Calculates the <see cref="ColorRGB"/> from one point to another.
-    /// </summary>
-    /// <param name="from">The starting point.</param>
-    /// <param name="to">The ending point.</param>
-    /// <returns>The <see cref="ColorRGB"/> from the starting point to the ending point.</returns>
-    public static ColorRGB FromTo(ColorRGB from, ColorRGB to) => to - from;
-
     /// <summary>
     /// Performs linear interpolation between two <see cref="ColorRGB"/>s.
     /// </summary>
@@ -117,26 +87,33 @@ public readonly struct ColorRGB(byte r, byte g, byte b)
     /// <param name="to">The ending <see cref="ColorRGB"/> (t = 1).</param>
     /// <param name="t">The interpolation parameter.</param>
     /// <returns>The interpolated <see cref="ColorRGB"/>.</returns>
-    public static ColorRGB Lerp(ColorRGB from, ColorRGB to, float t) => from + FromTo(from, to) * t;
+    public static ColorRGB Lerp(ColorRGB from, ColorRGB to, float t)
+    {
+        int redDiff = to.R - from.R;
+        int greenDiff = to.G - from.G;
+        int blueDiff = to.B - from.B;
 
-    /// <summary>
+        return from + new ColorRGB((byte)(redDiff * t), (byte)(greenDiff * t), (byte)(blueDiff * t));
-    /// Converts the <see cref="ColorRGB"/> to its string representation.
+    }
-    /// </summary>
-    /// <returns>A string representation of the <see cref="ColorRGB"/>.</returns>
-    public override string ToString() => $"{nameof(ColorRGB)}({R}, {G}, {B})";
 
     /// <summary>
     /// Determines whether the specified object is equal to the current <see cref="ColorRGB"/>.
     /// </summary>
     /// <param name="obj">The object to compare with the current <see cref="ColorRGB"/>.</param>
     /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="ColorRGB"/>; otherwise, <see cref="false"/>.</returns>
-    public override bool Equals(object? obj) => obj is ColorRGB objVec && R.Equals(objVec.R) && G.Equals(objVec.G) && B.Equals(objVec.B);
+    public override bool Equals(object? obj) => obj is ColorRGB colorRGB && this == colorRGB;
 
     /// <summary>
     /// Generates a hash code for the <see cref="ColorRGB"/>.
     /// </summary>
     /// <returns>A hash code for the <see cref="ColorRGB"/>.</returns>
     public override int GetHashCode() => System.HashCode.Combine(R, G, B);
+
+    /// <summary>
+    /// Converts the <see cref="ColorRGB"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="ColorRGB"/>.</returns>
+    public override string ToString() => $"{nameof(ColorRGB)}({R}, {G}, {B})";
 }
 
 /// <summary>
@@ -156,9 +133,6 @@ public static class ColorRGBExtensions
     /// <inheritdoc cref="ColorRGB.Divide(ColorRGB, ColorRGB)" />
     public static ColorRGB Divide(this ColorRGB color, float value) => ColorRGB.Divide(color, value);
 
-    /// <inheritdoc cref="ColorRGB.FromTo(ColorRGB, ColorRGB)" />
-    public static ColorRGB FromTo(this ColorRGB from, ColorRGB to) => ColorRGB.FromTo(from, to);
-
     /// <inheritdoc cref="ColorRGB.Lerp(ColorRGB, ColorRGB, float)" />
     public static ColorRGB Lerp(this ColorRGB from, ColorRGB to, float t) => ColorRGB.Lerp(from, to, t);
 }

Engine.Core/Primitives/ColorRGBA.cs

@@ -44,7 +44,31 @@ public readonly struct ColorRGBA(byte r, byte g, byte b, byte a = 255)
     public static bool operator !=(ColorRGBA left, ColorRGBA right) => left.R != right.R || left.G != right.G || left.B != right.B || left.A != right.A;
 
     public static implicit operator ColorRGBA(ColorRGB rgb) => new(rgb.R, rgb.G, rgb.B, 255);
-    public static implicit operator ColorRGBA(ColorHSV hsv) => (ColorRGB)hsv;
+    public static implicit operator ColorRGBA(ColorHSV hsv) => (ColorHSVA)hsv;
+    public static implicit operator ColorRGBA(ColorHSVA hsva)
+    {
+        float hue = hsva.Hue * 360f;
+        float chroma = hsva.Value * hsva.Saturation;
+        float x = chroma * (1f - Math.Abs(hue / 60f % 2f - 1f));
+        float m = hsva.Value - chroma;
+
+        float r1 = 0f;
+        float g1 = 0f;
+        float b1 = 0f;
+
+        if (hue < 60) { r1 = chroma; g1 = x; b1 = 0; }
+        else if (hue < 120) { r1 = x; g1 = chroma; b1 = 0; }
+        else if (hue < 180) { r1 = 0; g1 = chroma; b1 = x; }
+        else if (hue < 240) { r1 = 0; g1 = x; b1 = chroma; }
+        else if (hue < 300) { r1 = x; g1 = 0; b1 = chroma; }
+        else if (hue <= 360) { r1 = chroma; g1 = 0; b1 = x; }
+
+        byte r = (byte)Math.RoundToInt((r1 + m) * 255);
+        byte g = (byte)Math.RoundToInt((g1 + m) * 255);
+        byte b = (byte)Math.RoundToInt((b1 + m) * 255);
+
+        return new(r, g, b, (byte)(hsva.Alpha * 255));
+    }
 
     /// <summary>
     /// Inverts the given <see cref="ColorRGBA"/>.
@@ -85,14 +109,6 @@ public readonly struct ColorRGBA(byte r, byte g, byte b, byte a = 255)
     /// <returns>The result of dividing the <see cref="ColorRGBA"/> by the scalar value.</returns>
     public static ColorRGBA Divide(ColorRGBA color, float value) => color / value;
 
-    /// <summary>
-    /// Calculates the <see cref="ColorRGBA"/> from one point to another.
-    /// </summary>
-    /// <param name="from">The starting point.</param>
-    /// <param name="to">The ending point.</param>
-    /// <returns>The <see cref="ColorRGBA"/> from the starting point to the ending point.</returns>
-    public static ColorRGBA FromTo(ColorRGBA from, ColorRGBA to) => to - from;
-
     /// <summary>
     /// Performs linear interpolation between two <see cref="ColorRGBA"/>s.
     /// </summary>
@@ -100,26 +116,34 @@ public readonly struct ColorRGBA(byte r, byte g, byte b, byte a = 255)
     /// <param name="to">The ending <see cref="ColorRGBA"/> (t = 1).</param>
     /// <param name="t">The interpolation parameter.</param>
     /// <returns>The interpolated <see cref="ColorRGBA"/>.</returns>
-    public static ColorRGBA Lerp(ColorRGBA from, ColorRGBA to, float t) => from + FromTo(from, to) * t;
+    public static ColorRGBA Lerp(ColorRGBA from, ColorRGBA to, float t)
+    {
+        int redDiff = to.R - from.R;
+        int greenDiff = to.G - from.G;
+        int blueDiff = to.B - from.B;
+        int alphaDiff = to.A - from.A;
 
-    /// <summary>
+        return from + new ColorRGBA((byte)(redDiff * t), (byte)(greenDiff * t), (byte)(blueDiff * t), (byte)(alphaDiff * t));
-    /// Converts the <see cref="ColorRGBA"/> to its string representation.
+    }
-    /// </summary>
-    /// <returns>A string representation of the <see cref="ColorRGBA"/>.</returns>
-    public override string ToString() => $"{nameof(ColorRGBA)}({R}, {G}, {B}, {A})";
 
     /// <summary>
     /// Determines whether the specified object is equal to the current <see cref="ColorRGBA"/>.
     /// </summary>
     /// <param name="obj">The object to compare with the current <see cref="ColorRGBA"/>.</param>
     /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="ColorRGBA"/>; otherwise, <see cref="false"/>.</returns>
-    public override bool Equals(object? obj) => obj is ColorRGBA objVec && R.Equals(objVec.R) && G.Equals(objVec.G) && B.Equals(objVec.B) && A.Equals(objVec.A);
+    public override bool Equals(object? obj) => obj is ColorRGBA colorRGBA && this == colorRGBA;
 
     /// <summary>
     /// Generates a hash code for the <see cref="ColorRGBA"/>.
     /// </summary>
     /// <returns>A hash code for the <see cref="ColorRGBA"/>.</returns>
     public override int GetHashCode() => System.HashCode.Combine(R, G, B, A);
+
+    /// <summary>
+    /// Converts the <see cref="ColorRGBA"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="ColorRGBA"/>.</returns>
+    public override string ToString() => $"{nameof(ColorRGBA)}({R}, {G}, {B}, {A})";
 }
 
 /// <summary>
@@ -139,9 +163,6 @@ public static class ColorRGBAExtensions
     /// <inheritdoc cref="ColorRGBA.Divide(ColorRGBA, ColorRGBA)" />
     public static ColorRGBA Divide(this ColorRGBA color, float value) => ColorRGBA.Divide(color, value);
 
-    /// <inheritdoc cref="ColorRGBA.FromTo(ColorRGBA, ColorRGBA)" />
-    public static ColorRGBA FromTo(this ColorRGBA from, ColorRGBA to) => ColorRGBA.FromTo(from, to);
-
     /// <inheritdoc cref="ColorRGBA.Lerp(ColorRGBA, ColorRGBA, float)" />
     public static ColorRGBA Lerp(this ColorRGBA from, ColorRGBA to, float t) => ColorRGBA.Lerp(from, to, t);
 }

Engine.Core/Primitives/Line2D.cs

@@ -43,6 +43,9 @@ public readonly struct Line2D(Vector2D from, Vector2D to)
     /// </summary>
     public readonly float LengthSquared => From.FromTo(To).LengthSquared();
 
+    public static bool operator ==(Line2D left, Line2D right) => left.From == right.From && left.To == right.To;
+    public static bool operator !=(Line2D left, Line2D right) => left.From != right.From || left.To != right.To;
+
     /// <summary>
     /// The equation of the <see cref="Line2D"/> defined by this <see cref="Line2D"/> segment.
     /// </summary>
@@ -186,6 +189,25 @@ public readonly struct Line2D(Vector2D from, Vector2D to)
     /// <returns><see cref="true"/> if the <see cref="Line2D"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
     public static bool ApproximatelyEquals(Line2D left, Line2D right, float epsilon = float.Epsilon)
         => left.From.ApproximatelyEquals(right.From, epsilon) && left.To.ApproximatelyEquals(right.To, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Line2D"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Line2D"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Line2D"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Line2D line2D && this == line2D;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Line2D"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Line2D"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(From, To);
+
+    /// <summary>
+    /// Converts the <see cref="Line2D"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Line2D"/>.</returns>
+    public override string ToString() => $"{nameof(Line2D)}({From}, {To})";
 }
 
 /// <summary>

Engine.Core/Primitives/Line2DEquation.cs

@@ -1,47 +1,69 @@
 namespace Syntriax.Engine.Core;
 
 /// <summary>
-/// Represents a line equation in the form y = mx + b.
+/// Represents a <see cref="Line2DEquation"/> in the form y = mx + b.
 /// </summary>
 /// <param name="slope">The slope of the line.</param>
-/// <param name="offsetY">The y-intercept of the line.</param>
+/// <param name="offsetY">The Y intercept of the line.</param>
 /// <remarks>
-/// Initializes a new instance of the <see cref="Line2DEquation"/> struct with the specified slope and y-intercept.
+/// Initializes a new instance of the <see cref="Line2DEquation"/> struct with the specified slope and Y intercept.
 /// </remarks>
 [System.Diagnostics.DebuggerDisplay("y = {Slope}x + {OffsetY}")]
 public readonly struct Line2DEquation(float slope, float offsetY)
 {
     /// <summary>
-    /// The slope of the line equation.
+    /// The slope of the <see cref="Line2DEquation"/>.
     /// </summary>
     public readonly float Slope = slope;
 
     /// <summary>
-    /// The y-intercept of the line equation.
+    /// The Y intercept of the <see cref="Line2DEquation"/>.
     /// </summary>
     public readonly float OffsetY = offsetY;
 
+    public static bool operator ==(Line2DEquation left, Line2DEquation right) => left.Slope == right.Slope && left.OffsetY == right.OffsetY;
+    public static bool operator !=(Line2DEquation left, Line2DEquation right) => left.Slope != right.Slope || left.OffsetY != right.OffsetY;
+
     /// <summary>
-    /// Resolves the y-coordinate for a given x-coordinate using the line equation.
+    /// Resolves the Y coordinate for a given X coordinate using the <see cref="Line2DEquation"/>.
     /// </summary>
-    /// <param name="lineEquation">The line equation to resolve.</param>
+    /// <param name="lineEquation">The <see cref="Line2DEquation"/> to resolve.</param>
-    /// <param name="x">The x-coordinate for which to resolve the y-coordinate.</param>
+    /// <param name="x">The X coordinate for which to resolve the Y coordinate.</param>
-    /// <returns>The y-coordinate resolved using the line equation.</returns>
+    /// <returns>The Y coordinate resolved using the <see cref="Line2DEquation"/>.</returns>
     public static float Resolve(Line2DEquation lineEquation, float x) => lineEquation.Slope * x + lineEquation.OffsetY; // y = mx + b
 
     /// <summary>
-    /// Checks if two line equations are approximately equal.
+    /// Checks if two <see cref="Line2DEquation"/> are approximately equal.
     /// </summary>
-    /// <param name="left">The first line equation to compare.</param>
+    /// <param name="left">The first <see cref="Line2DEquation"/> to compare.</param>
-    /// <param name="right">The second line equation to compare.</param>
+    /// <param name="right">The second <see cref="Line2DEquation"/> to compare.</param>
     /// <param name="epsilon">The epsilon range.</param>
-    /// <returns>True if the line equations are approximately equal; otherwise, false.</returns>
+    /// <returns>True if the <see cref="Line2DEquation"/> are approximately equal; otherwise, false.</returns>
     public static bool ApproximatelyEquals(Line2DEquation left, Line2DEquation right, float epsilon = float.Epsilon)
         => left.Slope.ApproximatelyEquals(right.Slope, epsilon) && left.OffsetY.ApproximatelyEquals(right.OffsetY, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Line2DEquation"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Line2DEquation"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Line2DEquation"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Line2DEquation lineEquation && this == lineEquation;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Line2DEquation"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Line2DEquation"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(Slope, OffsetY);
+
+    /// <summary>
+    /// Converts the <see cref="Line2DEquation"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Line2DEquation"/>.</returns>
+    public override string ToString() => $"{nameof(Line2DEquation)}({Slope}, {OffsetY})";
 }
 
 /// <summary>
-/// Provides extension methods for the LineEquation struct.
+/// Provides extension methods for the <see cref="Line2DEquation"/> struct.
 /// </summary>
 public static class Line2DEquationExtensions
 {

Engine.Core/Primitives/Projection1D.cs

@@ -21,6 +21,9 @@ public readonly struct Projection1D(float min, float max)
     /// </summary>
     public readonly float Max = max;
 
+    public static bool operator ==(Projection1D left, Projection1D right) => left.Min == right.Min && left.Max == right.Max;
+    public static bool operator !=(Projection1D left, Projection1D right) => left.Min != right.Min || left.Max != right.Max;
+
     /// <summary>
     /// Checks if two projections overlap.
     /// </summary>
@@ -70,6 +73,35 @@ public readonly struct Projection1D(float min, float max)
         depth = 0f;
         return false;
     }
+
+    /// <summary>
+    /// Checks if two <see cref="Projection1D"/>s are approximately equal within a specified epsilon range.
+    /// </summary>
+    /// <param name="left">The first <see cref="Projection1D"/>.</param>
+    /// <param name="right">The second <see cref="Projection1D"/>.</param>
+    /// <param name="epsilon">The epsilon range.</param>
+    /// <returns><see cref="true"/> if the <see cref="Projection1D"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
+    public static bool ApproximatelyEquals(Projection1D left, Projection1D right, float epsilon = float.Epsilon)
+        => left.Min.ApproximatelyEquals(right.Min, epsilon) && left.Max.ApproximatelyEquals(right.Max, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Projection1D"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Projection1D"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Projection1D"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Projection1D projection1D && this == projection1D;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Projection1D"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Projection1D"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(Min, Max);
+
+    /// <summary>
+    /// Converts the <see cref="Projection1D"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Projection1D"/>.</returns>
+    public override string ToString() => $"{nameof(Projection1D)}({Min}, {Max})";
 }
 
 /// <summary>
@@ -82,4 +114,7 @@ public static class Projection1DExtensions
 
     /// <inheritdoc cref="Projection1D.Overlaps(Projection1D, Projection1D, out float)" />
     public static bool Overlaps(this Projection1D left, Projection1D right, out float depth) => Projection1D.Overlaps(left, right, out depth);
+
+    /// <inheritdoc cref="Projection1D.ApproximatelyEquals(Projection1D, Projection1D, float)" />
+    public static bool ApproximatelyEquals(this Projection1D left, Projection1D right, float epsilon = float.Epsilon) => Projection1D.ApproximatelyEquals(left, right, epsilon);
 }

Engine.Core/Primitives/Quaternion.cs

@@ -282,24 +282,24 @@ public readonly struct Quaternion(float x, float y, float z, float w)
     public static bool ApproximatelyEquals(Quaternion left, Quaternion right, float epsilon = float.Epsilon)
         => left.X.ApproximatelyEquals(right.X, epsilon) && left.Y.ApproximatelyEquals(right.Y, epsilon) && left.Z.ApproximatelyEquals(right.Z, epsilon) && left.W.ApproximatelyEquals(right.W, epsilon);
 
-    /// <summary>
-    /// Converts the <see cref="Quaternion"/> to its string representation.
-    /// </summary>
-    /// <returns>A string representation of the <see cref="Quaternion"/>.</returns>
-    public override string ToString() => $"{nameof(Quaternion)}({W}, {X}, {Y}, {Z})";
-
     /// <summary>
     /// Determines whether the specified object is equal to the current <see cref="Quaternion"/>.
     /// </summary>
     /// <param name="obj">The object to compare with the current <see cref="Quaternion"/>.</param>
     /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Quaternion"/>; otherwise, <see cref="false"/>.</returns>
-    public override bool Equals(object? obj) => obj is Quaternion objVec && X.Equals(objVec.X) && Y.Equals(objVec.Y) && Z.Equals(objVec.Z) && W.Equals(objVec.W);
+    public override bool Equals(object? obj) => obj is Quaternion quaternion && this == quaternion;
 
     /// <summary>
     /// Generates a hash code for the <see cref="Quaternion"/>.
     /// </summary>
     /// <returns>A hash code for the <see cref="Quaternion"/>.</returns>
-    public override int GetHashCode() => System.HashCode.Combine(X, Y, Z);
+    public override int GetHashCode() => System.HashCode.Combine(W, X, Y, Z);
+
+    /// <summary>
+    /// Converts the <see cref="Quaternion"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Quaternion"/>.</returns>
+    public override string ToString() => $"{nameof(Quaternion)}({W}, {X}, {Y}, {Z})";
 }
 
 /// <summary>

Engine.Core/Primitives/Ray2D.cs

@@ -1,5 +1,10 @@
 namespace Syntriax.Engine.Core;
 
+/// <summary>
+/// Represents an infinite ray in 2D space.
+/// </summary>
+/// <param name="Origin">The <see cref="Vector2D"/> in 2D space where the ray starts from.</param>
+/// <param name="Direction">Normalized <see cref="Vector2D"/> indicating the ray's is direction.</param> 
 public readonly struct Ray2D(Vector2D Origin, Vector2D Direction)
 {
     /// <summary>
@@ -17,6 +22,8 @@ public readonly struct Ray2D(Vector2D Origin, Vector2D Direction)
     /// </summary>
     public readonly Ray2D Reversed => new(Origin, -Direction);
 
+    public static bool operator ==(Ray2D left, Ray2D right) => left.Origin == right.Origin && left.Direction == right.Direction;
+    public static bool operator !=(Ray2D left, Ray2D right) => left.Origin != right.Origin || left.Direction != right.Direction;
     public static implicit operator Ray2D(Line2D line) => new(line.From, line.From.FromTo(line.To).Normalized);
 
     /// <summary>
@@ -48,6 +55,35 @@ public readonly struct Ray2D(Vector2D Origin, Vector2D Direction)
 
         return ray.Origin + ray.Direction * dot;
     }
+
+    /// <summary>
+    /// Checks if two <see cref="Ray2D"/>s are approximately equal within a specified epsilon range.
+    /// </summary>
+    /// <param name="left">The first <see cref="Ray2D"/>.</param>
+    /// <param name="right">The second <see cref="Ray2D"/>.</param>
+    /// <param name="epsilon">The epsilon range.</param>
+    /// <returns><see cref="true"/> if the <see cref="Ray2D"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
+    public static bool ApproximatelyEquals(Ray2D left, Ray2D right, float epsilon = float.Epsilon)
+        => left.Origin.ApproximatelyEquals(right.Origin, epsilon) && left.Direction.ApproximatelyEquals(right.Direction, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Ray2D"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Ray2D"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Ray2D"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Ray2D ray2D && this == ray2D;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Ray2D"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Ray2D"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(Origin, Direction);
+
+    /// <summary>
+    /// Converts the <see cref="Ray2D"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Ray2D"/>.</returns>
+    public override string ToString() => $"{nameof(Ray2D)}({Origin}, {Direction})";
 }
 
 /// <summary>
@@ -63,4 +99,7 @@ public static class Ray2DExtensions
 
     /// <inheritdoc cref="Ray2D.ClosestPointTo(Ray2D, Vector2D) />
     public static Vector2D ClosestPointTo(this Ray2D ray, Vector2D point) => Ray2D.ClosestPointTo(ray, point);
+
+    /// <inheritdoc cref="Ray2D.ApproximatelyEquals(Ray2D, Ray2D, float)" />
+    public static bool ApproximatelyEquals(this Ray2D left, Ray2D right, float epsilon = float.Epsilon) => Ray2D.ApproximatelyEquals(left, right, epsilon);
 }

Engine.Core/Primitives/Shape2D.cs

@@ -122,7 +122,7 @@ public class Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
         triangles.Clear();
 
         for (int i = 2; i < shape.Vertices.Count; i++)
-            triangles.Add(new Triangle(shape[0], shape[i - 1], shape[i]));
+            triangles.Add(new Triangle(shape[0], shape[i], shape[i - 1]));
     }
 
     /// <summary>
@@ -251,6 +251,34 @@ public class Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
         return true;
     }
 
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Shape2D"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Shape2D"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Shape2D"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Shape2D shape2D && _vertices.Equals(shape2D._vertices);
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Shape2D"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Shape2D"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(Vertices);
+
+    /// <summary>
+    /// Converts the <see cref="Shape2D"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Shape2D"/>.</returns>
+    public override string ToString()
+    {
+        System.Text.StringBuilder stringBuilder = new(Vertices[0].ToString());
+        for (int i = 1; i < Vertices.Count; i++)
+        {
+            stringBuilder.Append(", ");
+            stringBuilder.Append(Vertices[i].ToString());
+        }
+        return $"{nameof(Shape2D)}({stringBuilder})";
+    }
+
     /// <inheritdoc/>
     public IEnumerator<Vector2D> GetEnumerator() => Vertices.GetEnumerator();
 
@@ -270,7 +298,7 @@ public static class Shape2DExtensions
     public static Triangle ToSuperTriangle(this Shape2D shape) => Shape2D.GetSuperTriangle(shape);
 
     /// <inheritdoc cref="Shape2D.TriangulateConvex(Shape2D, IList{Triangle})" />
-    public static void ToTrianglesConvex(this Shape2D shape, IList<Triangle> lines) => Shape2D.TriangulateConvex(shape, lines);
+    public static void ToTrianglesConvex(this Shape2D shape, IList<Triangle> triangles) => Shape2D.TriangulateConvex(shape, triangles);
 
     /// <inheritdoc cref="Shape2D.TriangulateConvex(Shape2D)" />
     public static List<Triangle> ToTrianglesConvex(this Shape2D shape) => Shape2D.TriangulateConvex(shape);

Engine.Core/Primitives/Triangle.cs

@@ -7,6 +7,9 @@ public readonly struct Triangle(Vector2D A, Vector2D B, Vector2D C)
     public readonly Vector2D B { get; init; } = B;
     public readonly Vector2D C { get; init; } = C;
 
+    public static bool operator ==(Triangle left, Triangle right) => left.A == right.A && left.B == right.B && left.C == right.C;
+    public static bool operator !=(Triangle left, Triangle right) => left.A != right.A || left.B != right.B || left.C != right.C;
+
     public readonly float Area
         => .5f * Math.Abs(
                 A.X * (B.Y - C.Y) +
@@ -44,6 +47,25 @@ public readonly struct Triangle(Vector2D A, Vector2D B, Vector2D C)
     /// <returns><c>true</c> if the <see cref="Triangle"/>s are approximately equal; otherwise, <c>false</c>.</returns>
     public static bool ApproximatelyEquals(Triangle left, Triangle right, float epsilon = float.Epsilon)
         => left.A.ApproximatelyEquals(right.A, epsilon) && left.B.ApproximatelyEquals(right.B, epsilon) && left.C.ApproximatelyEquals(right.C, epsilon);
+
+    /// <summary>
+    /// Determines whether the specified object is equal to the current <see cref="Triangle"/>.
+    /// </summary>
+    /// <param name="obj">The object to compare with the current <see cref="Triangle"/>.</param>
+    /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Triangle"/>; otherwise, <see cref="false"/>.</returns>
+    public override bool Equals(object? obj) => obj is Triangle triangle && this == triangle;
+
+    /// <summary>
+    /// Generates a hash code for the <see cref="Triangle"/>.
+    /// </summary>
+    /// <returns>A hash code for the <see cref="Triangle"/>.</returns>
+    public override int GetHashCode() => System.HashCode.Combine(A, B, C);
+
+    /// <summary>
+    /// Converts the <see cref="Triangle"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Triangle"/>.</returns>
+    public override string ToString() => $"{nameof(Triangle)}({A}, {B}, {C})";
 }
 
 public static class TriangleExtensions

Engine.Core/Primitives/Vector2D.cs

@@ -302,24 +302,24 @@ public readonly struct Vector2D(float x, float y)
     public static bool ApproximatelyEquals(Vector2D left, Vector2D right, float epsilon = float.Epsilon)
         => left.X.ApproximatelyEquals(right.X, epsilon) && left.Y.ApproximatelyEquals(right.Y, epsilon);
 
-    /// <summary>
-    /// Converts the <see cref="Vector2D"/> to its string representation.
-    /// </summary>
-    /// <returns>A string representation of the <see cref="Vector2D"/>.</returns>
-    public override string ToString() => $"{nameof(Vector2D)}({X}, {Y})";
-
     /// <summary>
     /// Determines whether the specified object is equal to the current <see cref="Vector2D"/>.
     /// </summary>
     /// <param name="obj">The object to compare with the current <see cref="Vector2D"/>.</param>
     /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Vector2D"/>; otherwise, <see cref="false"/>.</returns>
-    public override bool Equals(object? obj) => obj is Vector2D objVec && X.Equals(objVec.X) && Y.Equals(objVec.Y);
+    public override bool Equals(object? obj) => obj is Vector2D vector2D && this == vector2D;
 
     /// <summary>
     /// Generates a hash code for the <see cref="Vector2D"/>.
     /// </summary>
     /// <returns>A hash code for the <see cref="Vector2D"/>.</returns>
     public override int GetHashCode() => System.HashCode.Combine(X, Y);
+
+    /// <summary>
+    /// Converts the <see cref="Vector2D"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Vector2D"/>.</returns>
+    public override string ToString() => $"{nameof(Vector2D)}({X}, {Y})";
 }
 
 /// <summary>

Engine.Core/Primitives/Vector3D.cs

@@ -271,24 +271,24 @@ public readonly struct Vector3D(float x, float y, float z)
     public static bool ApproximatelyEquals(Vector3D left, Vector3D right, float epsilon = float.Epsilon)
         => left.X.ApproximatelyEquals(right.X, epsilon) && left.Y.ApproximatelyEquals(right.Y, epsilon) && left.Z.ApproximatelyEquals(right.Z, epsilon);
 
-    /// <summary>
-    /// Converts the <see cref="Vector3D"/> to its string representation.
-    /// </summary>
-    /// <returns>A string representation of the <see cref="Vector3D"/>.</returns>
-    public override string ToString() => $"{nameof(Vector3D)}({X}, {Y}, {Z})";
-
     /// <summary>
     /// Determines whether the specified object is equal to the current <see cref="Vector3D"/>.
     /// </summary>
     /// <param name="obj">The object to compare with the current <see cref="Vector3D"/>.</param>
     /// <returns><see cref="true"/> if the specified object is equal to the current <see cref="Vector3D"/>; otherwise, <see cref="false"/>.</returns>
-    public override bool Equals(object? obj) => obj is Vector3D objVec && X.Equals(objVec.X) && Y.Equals(objVec.Y) && Z.Equals(objVec.Z);
+    public override bool Equals(object? obj) => obj is Vector3D vector3D && this == vector3D;
 
     /// <summary>
     /// Generates a hash code for the <see cref="Vector3D"/>.
     /// </summary>
     /// <returns>A hash code for the <see cref="Vector3D"/>.</returns>
     public override int GetHashCode() => System.HashCode.Combine(X, Y, Z);
+
+    /// <summary>
+    /// Converts the <see cref="Vector3D"/> to its string representation.
+    /// </summary>
+    /// <returns>A string representation of the <see cref="Vector3D"/>.</returns>
+    public override string ToString() => $"{nameof(Vector3D)}({X}, {Y}, {Z})";
 }
 
 /// <summary>

Engine.Core/Systems/Abstract/IEnterUniverse.cs

@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core;
+
+public interface IEnterUniverse : IBehaviour
+{
+    void EnterUniverse(IUniverse universe);
+}

Engine.Core/Systems/Abstract/IExitUniverse.cs

@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core;
+
+public interface IExitUniverse : IBehaviour
+{
+    void ExitUniverse(IUniverse universe);
+}

Engine.Core/Systems/Abstract/ILastFrameUpdate.cs

@@ -0,0 +1,6 @@
+namespace Syntriax.Engine.Core;
+
+public interface ILastFrameUpdate : IBehaviour
+{
+    void LastActiveFrame();
+}

Engine.Core/Systems/UniverseEntranceManager.cs

@@ -0,0 +1,71 @@
+using System.Collections.Generic;
+
+namespace Syntriax.Engine.Core;
+
+public class UniverseEntranceManager : Behaviour
+{
+    // We use Ascending order because we are using reverse for loop to call them
+    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+
+    private readonly ActiveBehaviourCollectorSorted<IEnterUniverse> enterUniverses = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollectorSorted<IExitUniverse> exitUniverses = new() { SortBy = SortByAscendingPriority() };
+
+    private readonly List<IEnterUniverse> toCallEnterUniverses = new(32);
+    private readonly List<IExitUniverse> toCallExitUniverses = new(32);
+
+    protected override void OnEnteredUniverse(IUniverse universe)
+    {
+        enterUniverses.Assign(universe);
+
+        foreach (IUniverseObject universeObject in Universe.UniverseObjects)
+            OnUniverseObjectRegistered(Universe, new(universeObject));
+
+        universe.OnUniverseObjectRegistered.AddListener(OnUniverseObjectRegistered);
+        universe.OnUniverseObjectUnRegistered.AddListener(OnUniverseObjectUnRegistered);
+    }
+
+    protected override void OnExitedUniverse(IUniverse universe)
+    {
+        enterUniverses.Unassign();
+
+        foreach (IUniverseObject universeObject in Universe.UniverseObjects)
+            OnUniverseObjectUnRegistered(Universe, new(universeObject));
+
+        universe.OnUniverseObjectRegistered.RemoveListener(OnUniverseObjectRegistered);
+        universe.OnUniverseObjectUnRegistered.RemoveListener(OnUniverseObjectUnRegistered);
+    }
+
+    private void OnUniverseObjectUnRegistered(IUniverse sender, IUniverse.UniverseObjectUnRegisteredArguments args)
+    {
+        for (int i = toCallExitUniverses.Count - 1; i >= 0; i--)
+        {
+            toCallExitUniverses[i].ExitUniverse(Universe);
+            toCallExitUniverses.RemoveAt(i);
+        }
+    }
+
+    private void OnUniverseObjectRegistered(IUniverse sender, IUniverse.UniverseObjectRegisteredArguments args)
+    {
+        for (int i = toCallEnterUniverses.Count - 1; i >= 0; i--)
+        {
+            toCallEnterUniverses[i].EnterUniverse(Universe);
+            toCallEnterUniverses.RemoveAt(i);
+        }
+    }
+
+    private void OnEnterUniverseCollected(IBehaviourCollector<IEnterUniverse> sender, IBehaviourCollector<IEnterUniverse>.BehaviourCollectedArguments args)
+    {
+        toCallEnterUniverses.Add(args.BehaviourCollected);
+    }
+
+    private void OnExitUniverseCollected(IBehaviourCollector<IExitUniverse> sender, IBehaviourCollector<IExitUniverse>.BehaviourCollectedArguments args)
+    {
+        toCallExitUniverses.Add(args.BehaviourCollected);
+    }
+
+    public UniverseEntranceManager()
+    {
+        enterUniverses.OnCollected.AddListener(OnEnterUniverseCollected);
+        exitUniverses.OnCollected.AddListener(OnExitUniverseCollected);
+    }
+}

Engine.Core/Systems/UpdateManager.cs

@@ -4,10 +4,11 @@ namespace Syntriax.Engine.Core;
 
 public class UpdateManager : Behaviour
 {
-    // We use Ascending order because draw calls are running from last to first
+    // We use Ascending order because we are using reverse for loop to call them
     private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
 
     private readonly ActiveBehaviourCollectorSorted<IFirstFrameUpdate> firstFrameUpdates = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollector<ILastFrameUpdate> lastFrameUpdates = new();
     private readonly ActiveBehaviourCollectorSorted<IPreUpdate> preUpdateEntities = new() { SortBy = SortByAscendingPriority() };
     private readonly ActiveBehaviourCollectorSorted<IUpdate> updateEntities = new() { SortBy = SortByAscendingPriority() };
     private readonly ActiveBehaviourCollectorSorted<IPostUpdate> postUpdateEntities = new() { SortBy = SortByAscendingPriority() };
@@ -17,6 +18,7 @@ public class UpdateManager : Behaviour
     protected override void OnEnteredUniverse(IUniverse universe)
     {
         firstFrameUpdates.Assign(universe);
+        lastFrameUpdates.Assign(universe);
         preUpdateEntities.Assign(universe);
         updateEntities.Assign(universe);
         postUpdateEntities.Assign(universe);
@@ -29,6 +31,7 @@ public class UpdateManager : Behaviour
     protected override void OnExitedUniverse(IUniverse universe)
     {
         firstFrameUpdates.Unassign();
+        lastFrameUpdates.Unassign();
         preUpdateEntities.Unassign();
         updateEntities.Unassign();
         postUpdateEntities.Unassign();
@@ -67,8 +70,14 @@ public class UpdateManager : Behaviour
         toCallFirstFrameUpdates.Add(args.BehaviourCollected);
     }
 
+    private void OnLastFrameRemoved(IBehaviourCollector<ILastFrameUpdate> sender, IBehaviourCollector<ILastFrameUpdate>.BehaviourRemovedArguments args)
+    {
+        args.BehaviourRemoved.LastActiveFrame();
+    }
+
     public UpdateManager()
     {
         firstFrameUpdates.OnCollected.AddListener(OnFirstFrameCollected);
+        lastFrameUpdates.OnRemoved.AddListener(OnLastFrameRemoved);
     }
 }

Engine.Core/Universe.cs

@@ -13,7 +13,9 @@ public class Universe : BaseEntity, IUniverse
     public Event<IUniverse> OnPreDraw { get; } = new();
     public Event<IUniverse> OnDraw { get; } = new();
     public Event<IUniverse> OnPostDraw { get; } = new();
+    public Event<IUniverse, IUniverse.UniverseObjectRegisteredArguments> OnPreUniverseObjectRegistered { get; } = new();
     public Event<IUniverse, IUniverse.UniverseObjectRegisteredArguments> OnUniverseObjectRegistered { get; } = new();
+    public Event<IUniverse, IUniverse.UniverseObjectUnRegisteredArguments> OnPreUniverseObjectUnRegistered { get; } = new();
     public Event<IUniverse, IUniverse.UniverseObjectUnRegisteredArguments> OnUniverseObjectUnRegistered { get; } = new();
     public Event<IUniverse, IUniverse.TimeScaleChangedArguments> OnTimeScaleChanged { get; } = new();
 
@@ -53,6 +55,8 @@ public class Universe : BaseEntity, IUniverse
         if (_universeObjects.Contains(universeObject))
             throw new Exception($"{nameof(IUniverseObject)} named {universeObject.Name} is already registered to the {nameof(Universe)}.");
 
+        OnPreUniverseObjectRegistered?.Invoke(this, new(universeObject));
+
         universeObject.OnFinalized.AddListener(delegateOnUniverseObjectFinalize);
         universeObject.OnExitedUniverse.AddListener(delegateOnUniverseObjectExitedUniverse);
 
@@ -79,7 +83,7 @@ public class Universe : BaseEntity, IUniverse
 
     public void Remove(IUniverseObject universeObject)
     {
-        universeObject.SetParent(null);
+        universeObject.Parent = null;
         RemoveIncursive(universeObject);
     }
 
@@ -88,6 +92,8 @@ public class Universe : BaseEntity, IUniverse
         if (!_universeObjects.Contains(universeObject))
             throw new Exception($"{nameof(IUniverseObject)} named {universeObject.Name} is not registered to the {nameof(Universe)}.");
 
+        OnPreUniverseObjectUnRegistered?.Invoke(this, new(universeObject));
+
         universeObject.OnFinalized.RemoveListener(delegateOnUniverseObjectFinalize);
         universeObject.OnExitedUniverse.RemoveListener(delegateOnUniverseObjectExitedUniverse);
 

Engine.Core/UniverseObject.cs

@@ -1,4 +1,3 @@
-using System.Collections;
 using System.Collections.Generic;
 
 namespace Syntriax.Engine.Core;
@@ -21,8 +20,8 @@ public class UniverseObject : BaseEntity, IUniverseObject
     private IBehaviourController _behaviourController = null!;
     private bool _isActive = false;
     private readonly List<IUniverseObject> _children = [];
+    private IUniverseObject? _parent = null;
 
-    public IUniverseObject? Parent { get; private set; } = null;
     public IReadOnlyList<IUniverseObject> Children => _children;
     public IBehaviourController BehaviourController => _behaviourController;
     public IUniverse Universe => _universe;
@@ -42,6 +41,40 @@ public class UniverseObject : BaseEntity, IUniverseObject
         }
     }
 
+    public IUniverseObject? Parent
+    {
+        get => _parent;
+        set
+        {
+            if (value == this)
+                throw new Exceptions.AssignFailedException($"{Name} can not parent itself");
+
+            if (_parent == value)
+                return;
+
+            IUniverseObject? previousParent = Parent;
+            if (previousParent is not null)
+            {
+                previousParent.RemoveChild(this);
+                previousParent.OnActiveChanged.RemoveListener(OnParentActiveChanged);
+            }
+
+            _parent = value;
+
+            if (value is not null)
+            {
+                if (value.IsInUniverse && !IsInUniverse)
+                    value.Universe.Register(this);
+
+                value.AddChild(this);
+                value.OnActiveChanged.AddListener(OnParentActiveChanged);
+            }
+
+            UpdateActive();
+            OnParentChanged?.Invoke(this, new(previousParent, value));
+        }
+    }
+
     protected virtual void OnEnteringUniverse(IUniverse universe) { }
     bool IUniverseObject.EnterUniverse(IUniverse universe)
     {
@@ -67,43 +100,13 @@ public class UniverseObject : BaseEntity, IUniverseObject
         return true;
     }
 
-    public void SetParent(IUniverseObject? parent)
-    {
-        if (parent == this)
-            throw new Exceptions.AssignFailedException($"{Name} can not parent itself");
-
-        if (Parent == parent)
-            return;
-
-        IUniverseObject? previousParent = Parent;
-        if (previousParent is not null)
-        {
-            previousParent.RemoveChild(this);
-            previousParent.OnActiveChanged.RemoveListener(OnParentActiveChanged);
-        }
-
-        Parent = parent;
-
-        if (parent is not null)
-        {
-            if (parent.IsInUniverse && !IsInUniverse)
-                parent.Universe.Register(this);
-
-            parent.AddChild(this);
-            parent.OnActiveChanged.AddListener(OnParentActiveChanged);
-        }
-
-        UpdateActive();
-        OnParentChanged?.Invoke(this, new(previousParent, parent));
-    }
-
     public void AddChild(IUniverseObject parent)
     {
         if (_children.Contains(parent))
             return;
 
         _children.Add(parent);
-        parent.SetParent(this);
+        parent.Parent = this;
         OnChildrenAdded?.Invoke(this, new(parent));
     }
 
@@ -112,7 +115,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
         if (!_children.Remove(child))
             return;
 
-        child.SetParent(null);
+        child.Parent = null;
         OnChildrenRemoved?.Invoke(this, new(child));
     }
 
@@ -133,6 +136,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
         base.OnAssign(stateEnable);
 
         stateEnable.OnEnabledChanged.AddListener(OnStateEnabledChanged);
+        UpdateActive();
     }
 
     private void OnParentActiveChanged(IActive sender, IActive.ActiveChangedArguments args) => UpdateActive();
@@ -164,7 +168,4 @@ public class UniverseObject : BaseEntity, IUniverseObject
     {
         _name = GetType().Name;
     }
-
-    public IEnumerator<IUniverseObject> GetEnumerator() => _children.GetEnumerator();
-    IEnumerator IEnumerable.GetEnumerator() => _children.GetEnumerator();
 }

Engine.Integration/Engine.Integration.MonoGame/Abstract/ILoadContent.cs

@@ -0,0 +1,10 @@
+using Microsoft.Xna.Framework.Content;
+
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Integration.MonoGame;
+
+public interface ILoadContent : IBehaviour
+{
+    void LoadContent(ContentManager content);
+}

Engine.Integration/Engine.Integration.MonoGame/Behaviours/DrawableShape.cs

@@ -4,7 +4,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Integration.MonoGame;
 
-public class DrawableShapeBehaviour : Behaviour2D, IDrawableTriangle, IPreDraw
+public class DrawableShape : Behaviour2D, IDrawableTriangle, IPreDraw
 {
     private readonly Shape2D shape = new([]);
     private readonly List<Triangle> worldTriangles = [];
@@ -23,7 +23,7 @@ public class DrawableShapeBehaviour : Behaviour2D, IDrawableTriangle, IPreDraw
 
     protected void UpdateWorldShape() => shape.Transform(Transform, worldShape);
 
-    public DrawableShapeBehaviour() => shape = Shape2D.Triangle;
+    public DrawableShape() => shape = Shape2D.Triangle;
-    public DrawableShapeBehaviour(Shape2D shape) => this.shape = shape;
+    public DrawableShape(Shape2D shape) => this.shape = shape;
-    public DrawableShapeBehaviour(Shape2D shape, ColorRGB color) { this.shape = shape; this.color = color; }
+    public DrawableShape(Shape2D shape, ColorRGB color) { this.shape = shape; this.color = color; }
 }

Engine.Integration/Engine.Integration.MonoGame/Behaviours/KeyboardInputs.cs

@@ -8,7 +8,7 @@ using Syntriax.Engine.Systems.Input;
 
 namespace Syntriax.Engine.Integration.MonoGame;
 
-public class KeyboardInputsBehaviour : Behaviour, IButtonInputs<Keys>, IUpdate
+public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
 {
     public Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments> OnAnyButtonPressed { get; } = new();
     public Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments> OnAnyButtonReleased { get; } = new();

Engine.Integration/Engine.Integration.MonoGame/Behaviours/LoadContentManager.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Integration.MonoGame;
+
+public class LoadContentManager : Behaviour, IFirstFrameUpdate
+{
+    // We use Ascending order because we are using reverse for loop to call them
+    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+
+    private readonly ActiveBehaviourCollectorSorted<ILoadContent> loadContents = new() { SortBy = SortByAscendingPriority() };
+    private readonly List<ILoadContent> toCallLoadContents = new(32);
+
+    private MonoGameWindowContainer monoGameWindowContainer = null!;
+
+    public void FirstActiveFrame()
+    {
+        monoGameWindowContainer = Universe.FindRequiredBehaviour<MonoGameWindowContainer>();
+    }
+
+    protected override void OnEnteredUniverse(IUniverse universe)
+    {
+        loadContents.Assign(universe);
+
+        universe.OnPreUpdate.AddListener(OnPreUpdate);
+    }
+
+    protected override void OnExitedUniverse(IUniverse universe)
+    {
+        loadContents.Unassign();
+
+        universe.OnPreUpdate.RemoveListener(OnPreUpdate);
+    }
+
+    private void OnPreUpdate(IUniverse sender, IUniverse.UpdateArguments args)
+    {
+        for (int i = toCallLoadContents.Count - 1; i >= 0; i--)
+        {
+            toCallLoadContents[i].LoadContent(monoGameWindowContainer.Window.Content);
+            toCallLoadContents.RemoveAt(i);
+        }
+    }
+
+    private void OnFirstFrameCollected(IBehaviourCollector<ILoadContent> sender, IBehaviourCollector<ILoadContent>.BehaviourCollectedArguments args)
+    {
+        toCallLoadContents.Add(args.BehaviourCollected);
+    }
+
+    public LoadContentManager()
+    {
+        loadContents.OnCollected.AddListener(OnFirstFrameCollected);
+    }
+}

Engine.Integration/Engine.Integration.MonoGame/Behaviours/MonoGameCamera2D.cs

@@ -5,7 +5,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Integration.MonoGame;
 
-public class MonoGameCamera2DBehaviour : BehaviourBase, ICamera2D, IFirstFrameUpdate, IPreDraw
+public class MonoGameCamera2D : BehaviourBase, ICamera2D, IFirstFrameUpdate, IPreDraw
 {
     public event MatrixTransformChangedArguments? OnMatrixTransformChanged = null;
     public event ViewportChangedArguments? OnViewportChanged = null;
@@ -103,7 +103,7 @@ public class MonoGameCamera2DBehaviour : BehaviourBase, ICamera2D, IFirstFrameUp
     protected sealed override void InitializeInternal() => Transform = BehaviourController.GetRequiredBehaviour<ITransform2D>();
     protected sealed override void FinalizeInternal() => Transform = null!;
 
-    public delegate void MatrixTransformChangedArguments(MonoGameCamera2DBehaviour sender);
+    public delegate void MatrixTransformChangedArguments(MonoGameCamera2D sender);
-    public delegate void ViewportChangedArguments(MonoGameCamera2DBehaviour sender);
+    public delegate void ViewportChangedArguments(MonoGameCamera2D sender);
-    public delegate void ZoomChangedArguments(MonoGameCamera2DBehaviour sender);
+    public delegate void ZoomChangedArguments(MonoGameCamera2D sender);
 }

Engine.Integration/Engine.Integration.MonoGame/Behaviours/SpriteBatcher.cs

@@ -9,14 +9,14 @@ public class SpriteBatcher : BehaviourBase, IFirstFrameUpdate, IDraw
     private static Comparer<IBehaviour> SortByPriority() => Comparer<IBehaviour>.Create((x, y) => y.Priority.CompareTo(x.Priority));
 
     private ISpriteBatch spriteBatch = null!;
-    private MonoGameCamera2DBehaviour camera2D = null!;
+    private MonoGameCamera2D camera2D = null!;
 
     private readonly ActiveBehaviourCollectorSorted<IDrawableSprite> drawableSprites = new() { SortBy = SortByPriority() };
 
     public void FirstActiveFrame()
     {
         MonoGameWindowContainer windowContainer = Universe.FindRequiredBehaviour<MonoGameWindowContainer>();
-        camera2D = Universe.FindRequiredBehaviour<MonoGameCamera2DBehaviour>();
+        camera2D = Universe.FindRequiredBehaviour<MonoGameCamera2D>();
 
         spriteBatch = new SpriteBatchWrapper(windowContainer.Window.GraphicsDevice);
         drawableSprites.Unassign();

Engine.Integration/Engine.Integration.MonoGame/Behaviours/TriangleBatcher.cs

@@ -11,13 +11,13 @@ public class TriangleBatcher : BehaviourBase, ITriangleBatch, IFirstFrameUpdate,
     private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
 
     private TriangleBatch triangleBatch = null!;
-    private MonoGameCamera2DBehaviour camera2D = null!;
+    private MonoGameCamera2D camera2D = null!;
     private readonly ActiveBehaviourCollectorSorted<IDrawableTriangle> drawableShapes = new() { SortBy = SortByAscendingPriority() };
 
     public void FirstActiveFrame()
     {
         MonoGameWindowContainer windowContainer = BehaviourController.UniverseObject.Universe.FindRequiredBehaviour<MonoGameWindowContainer>();
-        camera2D = BehaviourController.UniverseObject.Universe.FindRequiredBehaviour<MonoGameCamera2DBehaviour>();
+        camera2D = BehaviourController.UniverseObject.Universe.FindRequiredBehaviour<MonoGameCamera2D>();
 
         triangleBatch = new(windowContainer.Window.GraphicsDevice);
         drawableShapes.Unassign();

Engine.Integration/Engine.Integration.MonoGame/EngineConverter.cs

@@ -18,7 +18,16 @@ public static class EngineConverterExtensions
     public static Vector2D ToVector2D(this Vector2 vector) => new(vector.X, vector.Y);
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public static Color ToColor(this ColorRGBA rgba) => new(rgba.R, rgba.G, rgba.B, rgba.A);
+    public static Color ToColor(this ColorRGBA color) => new(color.R, color.G, color.B, color.A);
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Color ToPreMultipliedColor(this ColorRGBA color)
+    {
+        float alphaMultiplier = color.A / 255f;
+        return new((byte)(color.R * alphaMultiplier), (byte)(color.G * alphaMultiplier), (byte)(color.B * alphaMultiplier), color.A);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static ColorRGBA ToColorRGBA(this Color color) => new(color.R, color.G, color.B, color.A);
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static Vector2D ToVector2D(this Point point) => new(point.X, point.Y);

Engine.Integration/Engine.Integration.MonoGame/MonoGameWindow.cs

@@ -21,6 +21,9 @@ public class MonoGameWindow : Game
 
         Universe.InstantiateUniverseObject().SetUniverseObject("Window Container")
             .BehaviourController.AddBehaviour<MonoGameWindowContainer>(this);
+
+        Universe.InstantiateUniverseObject().SetUniverseObject("Content Loader")
+            .BehaviourController.AddBehaviour<LoadContentManager>();
     }
 
     protected override void Initialize()

Engine.Physics2D/Collider2DBase.cs

@@ -2,7 +2,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Physics2D;
 
-public abstract class Collider2DBehaviourBase : Behaviour2D, ICollider2D
+public abstract class Collider2DBase : Behaviour2D, ICollider2D
 {
     public Event<ICollider2D, CollisionDetectionInformation> OnCollisionDetected { get; } = new();
     public Event<ICollider2D, CollisionDetectionInformation> OnCollisionResolved { get; } = new();
@@ -18,7 +18,7 @@ public abstract class Collider2DBehaviourBase : Behaviour2D, ICollider2D
     protected bool NeedsRecalculation { get; set; } = true;
     protected IRigidBody2D? _rigidBody2D = null;
 
-    protected Collider2DBehaviourBase()
+    protected Collider2DBase()
     {
         delegateOnBehaviourAddedToController = OnBehaviourAddedToController;
         delegateOnBehaviourRemovedFromController = OnBehaviourRemovedFromController;

Engine.Physics2D/Collider2DCircle.cs

@@ -2,7 +2,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Physics2D;
 
-public class Collider2DCircleBehaviour : Collider2DBehaviourBase, ICircleCollider2D
+public class Collider2DCircle : Collider2DBase, ICircleCollider2D
 {
     private Circle _circleLocal = Circle.UnitCircle;
 
@@ -19,6 +19,6 @@ public class Collider2DCircleBehaviour : Collider2DBehaviourBase, ICircleCollide
 
     public override void CalculateCollider() => CircleWorld = Transform.Transform(_circleLocal);
 
-    public Collider2DCircleBehaviour() { }
+    public Collider2DCircle() { }
-    public Collider2DCircleBehaviour(Circle circle) => CircleLocal = circle;
+    public Collider2DCircle(Circle circle) => CircleLocal = circle;
 }

Engine.Physics2D/Collider2DShape.cs

@@ -2,7 +2,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Physics2D;
 
-public class Collider2DShapeBehaviour : Collider2DBehaviourBase, IShapeCollider2D
+public class Collider2DShape : Collider2DBase, IShapeCollider2D
 {
     public Shape2D ShapeWorld { get => _shapeWorld; protected set => _shapeWorld = value; }
     public Shape2D ShapeLocal
@@ -15,13 +15,13 @@ public class Collider2DShapeBehaviour : Collider2DBehaviourBase, IShapeCollider2
         }
     }
 
-    private Shape2D _shapeWorld = Shape2D.Square.CreateCopy();
+    private Shape2D _shapeWorld = Shape2D.Square;
     private Shape2D _shapeLocal = Shape2D.Square;
 
     public override void CalculateCollider() => ShapeLocal.Transform(Transform, _shapeWorld);
 
-    public Collider2DShapeBehaviour() { }
+    public Collider2DShape() { }
-    public Collider2DShapeBehaviour(Shape2D shape)
+    public Collider2DShape(Shape2D shape)
     {
         ShapeLocal = shape;
     }

Engine.Physics2D/PhysicsEngine2D.cs

@@ -25,11 +25,11 @@ public class PhysicsEngine2D : Behaviour, IPreUpdate, IPhysicsEngine2D
     protected BehaviourCollector<IRigidBody2D> rigidBodyCollector = new();
     protected BehaviourCollector<ICollider2D> colliderCollector = new();
 
-    private readonly ListPool<ICollider2D> colliderPool = new(() => new(32));
+    private readonly ListPool<ICollider2D> colliderPool = new();
-    private readonly ListPool<IPrePhysicsUpdate> prePhysicsUpdatePool = new(() => new(32));
+    private readonly ListPool<IPrePhysicsUpdate> prePhysicsUpdatePool = new();
-    private readonly ListPool<IPhysicsUpdate> physicsUpdatePool = new(() => new(32));
+    private readonly ListPool<IPhysicsUpdate> physicsUpdatePool = new();
-    private readonly ListPool<IPhysicsIteration> physicsIterationPool = new(() => new(32));
+    private readonly ListPool<IPhysicsIteration> physicsIterationPool = new();
-    private readonly ListPool<IPostPhysicsUpdate> postPhysicsUpdatePool = new(() => new(32));
+    private readonly ListPool<IPostPhysicsUpdate> postPhysicsUpdatePool = new();
 
     public int IterationPerStep { get => _iterationPerStep; set => _iterationPerStep = value < 1 ? 1 : value; }
     public float IterationPeriod { get => _iterationPeriod; set => _iterationPeriod = value.Max(0.0001f); }

Engine.Physics2D/PhysicsEngine2DStandalone.cs

@@ -21,6 +21,12 @@ public class PhysicsEngine2DStandalone : IPhysicsEngine2D
     private readonly ICollisionResolver2D collisionResolver = null!;
     private readonly IRaycastResolver2D raycastResolver = null!;
 
+    private readonly ListPool<ICollider2D> colliderPool = new();
+    private readonly ListPool<IPrePhysicsUpdate> prePhysicsUpdatePool = new();
+    private readonly ListPool<IPhysicsUpdate> physicsUpdatePool = new();
+    private readonly ListPool<IPhysicsIteration> physicsIterationPool = new();
+    private readonly ListPool<IPostPhysicsUpdate> postPhysicsUpdatePool = new();
+
     public int IterationPerStep { get => _iterationCount; set => _iterationCount = value < 1 ? 1 : value; }
 
     public void AddRigidBody(IRigidBody2D rigidBody)
@@ -112,11 +118,11 @@ public class PhysicsEngine2DStandalone : IPhysicsEngine2D
     {
         float intervalDeltaTime = deltaTime / IterationPerStep;
 
-        List<ICollider2D> childColliders = [];
+        List<ICollider2D> childColliders = colliderPool.Get();
-        List<IPrePhysicsUpdate> physicsPreUpdates = [];
+        List<IPrePhysicsUpdate> physicsPreUpdates = prePhysicsUpdatePool.Get();
-        List<IPhysicsUpdate> physicsUpdates = [];
+        List<IPhysicsUpdate> physicsUpdates = physicsUpdatePool.Get();
-        List<IPhysicsIteration> physicsIterations = [];
+        List<IPhysicsIteration> physicsIterations = physicsIterationPool.Get();
-        List<IPostPhysicsUpdate> physicsPostUpdates = [];
+        List<IPostPhysicsUpdate> physicsPostUpdates = postPhysicsUpdatePool.Get();
 
         rigidBody.BehaviourController.GetBehavioursInChildren(childColliders);
         rigidBody.BehaviourController.GetBehavioursInChildren(physicsPreUpdates);
@@ -160,6 +166,12 @@ public class PhysicsEngine2DStandalone : IPhysicsEngine2D
 
         for (int i = physicsPostUpdates.Count - 1; i >= 0; i--)
             physicsPostUpdates[i].PostPhysicsUpdate(deltaTime);
+
+        colliderPool.Return(childColliders);
+        prePhysicsUpdatePool.Return(physicsPreUpdates);
+        physicsUpdatePool.Return(physicsUpdates);
+        physicsIterationPool.Return(physicsIterations);
+        postPhysicsUpdatePool.Return(physicsPostUpdates);
     }
 
     private void ResolveColliders(ICollider2D colliderX, ICollider2D colliderY)

Engine.Physics2D/RaycastResolver2D.cs

@@ -6,7 +6,7 @@ namespace Syntriax.Engine.Physics2D;
 
 public class RaycastResolver2D : IRaycastResolver2D
 {
-    private readonly ListPool<Line2D> lineCacheQueue = new(() => new(4));
+    private readonly ListPool<Line2D> lineCacheQueue = new(initialListCapacity: 4);
 
     RaycastResult? IRaycastResolver2D.RaycastAgainst<T>(T shape, Ray2D ray, float length)
     {

Engine.Systems/Time/ITicker.cs

@@ -2,7 +2,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Systems.Time;
 
-public interface ITicker : IStopwatch
+public interface ITicker
 {
     Event<ITicker> OnTick { get; }
 

Engine.Systems/Time/Stopwatch.cs

@@ -2,7 +2,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Systems.Time;
 
-public class StopwatchBehaviour : Behaviour, IUpdate, IStopwatch
+public class Stopwatch : Behaviour, IUpdate, IStopwatch
 {
     public Event<IReadOnlyStopwatch> OnStarted { get; } = new();
     public Event<IReadOnlyStopwatch, IReadOnlyStopwatch.StopwatchDeltaArguments> OnDelta { get; } = new();

Engine.Systems/Time/TickerStopwatch.cs

@@ -2,14 +2,14 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Systems.Time;
 
-public class TickerBehaviour : StopwatchBehaviour, ITicker
+public class TickerStopwatch : Stopwatch, ITicker
 {
     public Event<ITicker> OnTick { get; } = new();
 
     public double Period { get; set; } = 1f;
     public int TickCounter { get; private set; } = 0;
 
-    private double nextTick = 0f;
+    private double nextTick = double.MaxValue;
 
     public override void Start()
     {
@@ -22,7 +22,7 @@ public class TickerBehaviour : StopwatchBehaviour, ITicker
     {
         base.Update();
 
-        while (Time > nextTick)
+        while (Time >= nextTick)
         {
             nextTick += Period;
             TickCounter++;

Engine.Systems/Time/TickerTimer.cs

@@ -0,0 +1,40 @@
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Systems.Time;
+
+public class TickerTimer : Timer, ITicker
+{
+    public Event<ITicker> OnTick { get; } = new();
+
+    public double Period { get; set; } = 1f;
+    public int TickCounter { get; private set; } = 0;
+
+    private double nextTick = double.MinValue;
+
+    public override void Start(double time)
+    {
+        TickCounter = 0;
+        base.Start(time);
+        nextTick = Remaining - Period;
+    }
+
+    public override void Update()
+    {
+        base.Update();
+
+        while (Remaining <= nextTick)
+        {
+            nextTick -= Period;
+            TickCounter++;
+            OnTick?.Invoke(this);
+        }
+    }
+
+    protected override void OnFinalize()
+    {
+        base.OnFinalize();
+
+        TickCounter = 0;
+        nextTick = 0f;
+    }
+}

Engine.Systems/Time/Timer.cs

@@ -2,7 +2,7 @@ using Syntriax.Engine.Core;
 
 namespace Syntriax.Engine.Systems.Time;
 
-public class TimerBehaviour : Behaviour, IUpdate, ITimer
+public class Timer : Behaviour, IUpdate, ITimer
 {
     public Event<IReadOnlyTimer> OnStarted { get; } = new();
     public Event<IReadOnlyTimer, IReadOnlyTimer.TimerDeltaArguments> OnDelta { get; } = new();
@@ -53,7 +53,7 @@ public class TimerBehaviour : Behaviour, IUpdate, ITimer
         OnStopped?.Invoke(this);
     }
 
-    public void Update()
+    public virtual void Update()
     {
         if (State is not TimerState.Ticking)
             return;

Engine.Systems/Tween/Easings.cs

@@ -9,8 +9,8 @@ internal static class EaseConstants
     internal const float c1 = 1.70158f;
     internal const float c2 = c1 * 1.525f;
     internal const float c3 = c1 + 1f;
-    internal const float c4 = 2f * Math.PI / 3f;
+    internal const float c4 = 2f * Math.Pi / 3f;
-    internal const float c5 = 2f * Math.PI / 4.5f;
+    internal const float c5 = 2f * Math.Pi / 4.5f;
 }
 
 public abstract class EasingBase<T> where T : IEasing, new() { public static readonly T Instance = new(); }
@@ -33,9 +33,9 @@ public class EaseInQuint : EasingBase<EaseInQuint>, IEasing { public float Evalu
 public class EaseOutQuint : EasingBase<EaseOutQuint>, IEasing { public float Evaluate(float x) => 1f - Math.Pow(1f - x, 5f); }
 public class EaseInOutQuint : EasingBase<EaseInOutQuint>, IEasing { public float Evaluate(float x) => x < .5f ? 16f * x * x * x * x * x : 1f - Math.Pow(-2f * x + 2f, 5f) * .5f; }
 
-public class EaseInSine : EasingBase<EaseInSine>, IEasing { public float Evaluate(float x) => 1f - Math.Cos(x * Math.PI * .5f); }
+public class EaseInSine : EasingBase<EaseInSine>, IEasing { public float Evaluate(float x) => 1f - Math.Cos(x * Math.Pi * .5f); }
-public class EaseOutSine : EasingBase<EaseOutSine>, IEasing { public float Evaluate(float x) => Math.Sin(x * Math.PI * .5f); }
+public class EaseOutSine : EasingBase<EaseOutSine>, IEasing { public float Evaluate(float x) => Math.Sin(x * Math.Pi * .5f); }
-public class EaseInOutSine : EasingBase<EaseInOutSine>, IEasing { public float Evaluate(float x) => -(Math.Cos(Math.PI * x) - 1f) * .5f; }
+public class EaseInOutSine : EasingBase<EaseInOutSine>, IEasing { public float Evaluate(float x) => -(Math.Cos(Math.Pi * x) - 1f) * .5f; }
 
 public class EaseInExpo : EasingBase<EaseInExpo>, IEasing { public float Evaluate(float x) => x == 0f ? 0f : Math.Pow(2f, 10f * x - 10f); }
 public class EaseOutExpo : EasingBase<EaseOutExpo>, IEasing { public float Evaluate(float x) => x == 1f ? 1f : 1f - Math.Pow(2f, -10f * x); }

Engine.Systems/Tween/EngineExtensions/TweenColorExtensions.cs

@@ -5,11 +5,14 @@ namespace Syntriax.Engine.Systems.Tween;
 public static class TweenColorExtensions
 {
     public static ITween TweenColor(this ColorRGB initialColorRGB, ITweenManager tweenManager, float duration, ColorRGB targetColorRGB, System.Action<ColorRGB> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialColorRGB.Lerp(targetColorRGB, t)));
+        => TweenColor((ColorHSV)initialColorRGB, tweenManager, duration, (ColorHSV)targetColorRGB, color => setMethod?.Invoke(color));
 
     public static ITween TweenColor(this ColorRGBA initialColorRGBA, ITweenManager tweenManager, float duration, ColorRGBA targetColorRGBA, System.Action<ColorRGBA> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialColorRGBA.Lerp(targetColorRGBA, t)));
+        => TweenColor((ColorHSVA)initialColorRGBA, tweenManager, duration, (ColorHSVA)targetColorRGBA, color => setMethod?.Invoke(color));
 
     public static ITween TweenColor(this ColorHSV initialColorHSV, ITweenManager tweenManager, float duration, ColorHSV targetColorHSV, System.Action<ColorHSV> setMethod)
         => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialColorHSV.Lerp(targetColorHSV, t)));
+
+    public static ITween TweenColor(this ColorHSVA initialColorHSVA, ITweenManager tweenManager, float duration, ColorHSVA targetColorHSVA, System.Action<ColorHSVA> setMethod)
+        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialColorHSVA.Lerp(targetColorHSVA, t)));
 }

Engine.Tests/Core/BehaviourController_Tests.cs

@@ -0,0 +1,271 @@
+using Syntriax.Engine.Core;
+using Syntriax.Engine.Core.Exceptions;
+
+namespace Engine.Tests;
+
+public class BehaviourController_Tests
+{
+    [Fact]
+    public void GetRequiredBehaviour()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        behaviourController.AddBehaviour<BehaviourX>();
+        Assert.NotNull(behaviourController.GetRequiredBehaviour<BehaviourX>());
+    }
+
+    [Fact]
+    public void GetRequiredBehaviourRaisesExceptionIfNotFound()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        Assert.Throws<BehaviourNotFoundException>(behaviourController.GetRequiredBehaviour<BehaviourX>);
+    }
+
+    [Fact]
+    public void AddSingleBehaviour()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        Assert.NotNull(behaviourController.AddBehaviour<BehaviourX>());
+        Assert.NotNull(behaviourController.GetBehaviour<BehaviourX>());
+    }
+
+    [Fact]
+    public void AddMultipleBehaviours()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        BehaviourX behaviourX = behaviourController.AddBehaviour<BehaviourX>();
+        BehaviourY behaviourY = behaviourController.AddBehaviour<BehaviourY>();
+
+        bool isXFound = false;
+        bool isYFound = false;
+
+        foreach (IBehaviour behaviour in behaviourController.GetBehaviours<IBehaviour>())
+        {
+            if (behaviour == behaviourX) isXFound = true;
+            if (behaviour == behaviourY) isYFound = true;
+        }
+
+        Assert.True(isXFound && isYFound);
+    }
+
+    [Fact]
+    public void AddThenRemoveBehaviour()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        behaviourController.AddBehaviour<BehaviourX>();
+        behaviourController.RemoveBehaviour<BehaviourX>();
+        Assert.Null(behaviourController.GetBehaviour<BehaviourX>());
+    }
+
+    [Fact]
+    public void GetOrAddBehaviourExtension()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        Assert.Null(behaviourController.GetBehaviour<BehaviourX>());
+        Assert.NotNull(behaviourController.GetOrAddBehaviour<BehaviourX>());
+    }
+
+    [Fact]
+    public void GetOrAddBehaviourExtensionFallback()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        Assert.Null(behaviourController.GetBehaviour<IBehaviour>());
+        Assert.NotNull(behaviourController.GetOrAddBehaviour<IBehaviour, BehaviourX>());
+    }
+
+    [Fact]
+    public void RemoveSpecificBehaviourViaGeneric()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        behaviourController.AddBehaviour<BehaviourX>();
+        behaviourController.AddBehaviour<BehaviourY>();
+        behaviourController.RemoveBehaviour<BehaviourY>();
+
+        Assert.NotNull(behaviourController.GetBehaviour<BehaviourX>());
+        Assert.Null(behaviourController.GetBehaviour<BehaviourY>());
+    }
+
+    [Fact]
+    public void RemoveSpecificBehaviourViaReference()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        behaviourController.AddBehaviour<BehaviourX>();
+
+        BehaviourY behaviourYFirst = behaviourController.AddBehaviour<BehaviourY>();
+        BehaviourY behaviourYSecond = behaviourController.AddBehaviour<BehaviourY>();
+
+        behaviourController.RemoveBehaviour(behaviourYFirst);
+
+        Assert.Equal(behaviourController.GetBehaviour<BehaviourY>(), behaviourYSecond);
+        Assert.NotNull(behaviourController.GetBehaviour<BehaviourX>());
+    }
+
+    [Fact]
+    public void AddBehaviourSameTypeCreatesSeparateInstances()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        BehaviourY first = behaviourController.AddBehaviour<BehaviourY>();
+        BehaviourY second = behaviourController.AddBehaviour<BehaviourY>();
+
+        Assert.NotSame(first, second);
+    }
+
+    [Fact]
+    public void BehaviourAddedEvents()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        IBehaviourController? sender = null;
+        IBehaviourController.BehaviourAddedArguments? arguments = null;
+
+        behaviourController.OnBehaviourAdded.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        BehaviourX behaviour = behaviourController.AddBehaviour<BehaviourX>();
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+        Assert.Equal(behaviourController, sender);
+        Assert.Equal(behaviour, arguments.Value.BehaviourAdded);
+    }
+
+    [Fact]
+    public void BehaviourRemovedEvents()
+    {
+        IBehaviourController behaviourController = CreateUniverseObject().BehaviourController;
+
+        IBehaviourController? sender = null;
+        IBehaviourController.BehaviourRemovedArguments? arguments = null;
+
+        behaviourController.OnBehaviourRemoved.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        BehaviourX behaviour = behaviourController.AddBehaviour<BehaviourX>();
+        behaviourController.RemoveBehaviour<BehaviourX>();
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+        Assert.Equal(behaviourController, sender);
+        Assert.Equal(behaviour, arguments.Value.BehaviourRemoved);
+    }
+
+    #region Hierarchy Structure
+
+    private static IUniverseObject CreateUniverseObject()
+    {
+        UniverseObject universeObject = new();
+        BehaviourController behaviourController = new();
+
+        universeObject.Assign(new StateEnable());
+        universeObject.StateEnable.Assign(universeObject);
+
+        behaviourController.Assign(new StateEnable());
+        behaviourController.StateEnable.Assign(behaviourController);
+
+        behaviourController.Assign(universeObject);
+        universeObject.Assign(behaviourController);
+
+        universeObject.Initialize();
+        behaviourController.Initialize();
+
+        return universeObject;
+    }
+
+    public static IUniverseObject CreateParentChildScenario()
+    {
+        IUniverseObject parentUO = CreateUniverseObject().SetUniverseObject("Parent");
+        IUniverseObject middleUO = CreateUniverseObject().SetUniverseObject("Middle", parentUO);
+        IUniverseObject childUO = CreateUniverseObject().SetUniverseObject("Child", middleUO);
+
+        parentUO.BehaviourController.AddBehaviour<BehaviourY>();
+        middleUO.BehaviourController.AddBehaviour<BehaviourX>();
+        childUO.BehaviourController.AddBehaviour<BehaviourY>();
+
+        return middleUO;
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInParent()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.NotNull(universeObject.BehaviourController.GetBehaviourInParent<BehaviourY>());
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInChildren()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.NotNull(universeObject.BehaviourController.GetBehaviourInChildren<BehaviourY>());
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInChildrenOnSameObject()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.NotNull(universeObject.BehaviourController.GetBehaviourInChildren<BehaviourX>());
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInParentOnSameObject()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.NotNull(universeObject.BehaviourController.GetBehaviourInParent<BehaviourX>());
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInParentRaisesExceptionIfNotFound()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.Throws<BehaviourNotFoundException>(universeObject.BehaviourController.GetRequiredBehaviourInParent<BehaviourZ>);
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInChildrenRaisesExceptionIfNotFound()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.Throws<BehaviourNotFoundException>(universeObject.BehaviourController.GetRequiredBehaviourInChildren<BehaviourZ>);
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInChildrenOnSameObjectRaisesExceptionIfNotFound()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.Throws<BehaviourNotFoundException>(universeObject.BehaviourController.GetRequiredBehaviourInChildren<BehaviourZ>);
+    }
+
+    [Fact]
+    public void ParentChildScenarioGetBehaviourInParentOnSameObjectRaisesExceptionIfNotFound()
+    {
+        IUniverseObject universeObject = CreateParentChildScenario();
+
+        Assert.Throws<BehaviourNotFoundException>(universeObject.BehaviourController.GetRequiredBehaviourInParent<BehaviourZ>);
+    }
+
+    #endregion
+
+    private class BehaviourX : BehaviourBase;
+    private class BehaviourY : BehaviourBase;
+    private class BehaviourZ : BehaviourBase;
+}

Engine.Tests/Core/Behaviour_Tests.cs

@@ -0,0 +1,72 @@
+using Syntriax.Engine.Core;
+
+namespace Engine.Tests;
+
+public class Behaviour_Tests
+{
+    private static IUniverseObject CreateUniverseObject()
+    {
+        UniverseObject universeObject = new();
+        BehaviourController behaviourController = new();
+
+        universeObject.Assign(new StateEnable());
+        universeObject.StateEnable.Assign(universeObject);
+
+        behaviourController.Assign(new StateEnable());
+        behaviourController.StateEnable.Assign(behaviourController);
+
+        behaviourController.Assign(universeObject);
+        universeObject.Assign(behaviourController);
+
+        universeObject.Initialize();
+        behaviourController.Initialize();
+
+        return universeObject;
+    }
+
+    [Fact]
+    public void BehaviourActive()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+
+        BehaviourX behaviourX = universeObject.BehaviourController.AddBehaviour<BehaviourX>();
+        behaviourX.StateEnable.Enabled = true;
+
+        Assert.True(behaviourX.IsActive);
+    }
+
+    [Fact]
+    public void BehaviourNotActiveOnDisabled()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+
+        BehaviourX behaviourX = universeObject.BehaviourController.AddBehaviour<BehaviourX>();
+        behaviourX.StateEnable.Enabled = false;
+
+        Assert.False(behaviourX.IsActive);
+    }
+
+    [Fact]
+    public void BehaviourNotActiveOnBehaviourControllerDisabled()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+
+        BehaviourX behaviourX = universeObject.BehaviourController.AddBehaviour<BehaviourX>();
+        universeObject.BehaviourController.StateEnable.Enabled = false;
+
+        Assert.False(behaviourX.IsActive);
+    }
+
+    [Fact]
+    public void BehaviourNotActiveOnUniverseObjectDisabled()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+
+        BehaviourX behaviourX = universeObject.BehaviourController.AddBehaviour<BehaviourX>();
+        universeObject.StateEnable.Enabled = false;
+
+        Assert.False(behaviourX.IsActive);
+    }
+
+    public class BehaviourX : BehaviourBase;
+}

Engine.Tests/Core/UniverseObject_Tests.cs

@@ -0,0 +1,272 @@
+using Syntriax.Engine.Core;
+
+namespace Engine.Tests;
+
+public class UniverseObject_Tests
+{
+    private static IUniverseObject CreateUniverseObject()
+    {
+        UniverseObject universeObject = new();
+        BehaviourController behaviourController = new();
+
+        universeObject.Assign(new StateEnable());
+
+        behaviourController.Assign(new StateEnable());
+        behaviourController.StateEnable.Assign(behaviourController);
+
+        behaviourController.Assign(universeObject);
+        universeObject.Assign(behaviourController);
+
+        universeObject.Initialize();
+        behaviourController.Initialize();
+
+        return universeObject;
+    }
+
+    [Fact]
+    public void AddChildren()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        parentUO.AddChild(childUO);
+        Assert.NotEmpty(parentUO.Children);
+        Assert.Equal(parentUO.Children[0], childUO);
+        Assert.Equal(childUO.Parent, parentUO);
+    }
+
+    [Fact]
+    public void RemoveChildren()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        parentUO.AddChild(childUO);
+        Assert.NotEmpty(parentUO.Children);
+        Assert.Contains(childUO, parentUO.Children);
+        Assert.Equal(childUO.Parent, parentUO);
+
+        parentUO.RemoveChild(childUO);
+        Assert.Empty(parentUO.Children);
+        Assert.Null(childUO.Parent);
+    }
+
+    [Fact]
+    public void SetParentValue()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        childUO.Parent = parentUO;
+        Assert.Contains(childUO, parentUO.Children);
+        Assert.Equal(childUO.Parent, parentUO);
+    }
+
+    [Fact]
+    public void SetParentNull()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        parentUO.AddChild(childUO);
+
+        childUO.Parent = null;
+        Assert.Empty(parentUO.Children);
+        Assert.Null(childUO.Parent);
+    }
+
+    [Fact]
+    public void AddChildrenEvents()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        IUniverseObject? sender = null;
+        IUniverseObject.ChildrenAddedArguments? arguments = null;
+
+        parentUO.OnChildrenAdded.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        parentUO.AddChild(childUO);
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+        Assert.Equal(parentUO, sender);
+        Assert.Equal(childUO, arguments.Value.ChildrenAdded);
+    }
+
+    [Fact]
+    public void RemoveChildrenEvents()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        IUniverseObject? sender = null;
+        IUniverseObject.ChildrenRemovedArguments? arguments = null;
+
+        parentUO.AddChild(childUO);
+
+        parentUO.OnChildrenRemoved.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        parentUO.RemoveChild(childUO);
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+        Assert.Equal(parentUO, sender);
+        Assert.Equal(childUO, arguments.Value.ChildrenRemoved);
+    }
+
+    [Fact]
+    public void SetParentEvents()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        IUniverseObject? sender = null;
+        IUniverseObject.ParentChangedArguments? arguments = null;
+
+        childUO.OnParentChanged.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        childUO.Parent = parentUO;
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+        Assert.Equal(childUO, sender);
+        Assert.Null(arguments.Value.PreviousParent);
+        Assert.Equal(parentUO, arguments.Value.CurrentParent);
+    }
+
+    [Fact]
+    public void UnsetParentEvents()
+    {
+        IUniverseObject parentUO = CreateUniverseObject();
+        IUniverseObject childUO = CreateUniverseObject();
+
+        IUniverseObject? sender = null;
+        IUniverseObject.ParentChangedArguments? arguments = null;
+
+        childUO.Parent = parentUO;
+
+        childUO.OnParentChanged.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        childUO.Parent = null;
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+        Assert.Equal(childUO, sender);
+        Assert.Equal(parentUO, arguments.Value.PreviousParent);
+        Assert.Null(arguments.Value.CurrentParent);
+    }
+
+    [Fact]
+    public void Active()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+        universeObject.StateEnable.Enabled = true;
+
+        Assert.True(universeObject.IsActive);
+    }
+
+    [Fact]
+    public void NotActiveWhenDisabled()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+        universeObject.StateEnable.Enabled = false;
+
+        Assert.False(universeObject.IsActive);
+    }
+
+    [Fact]
+    public void ActiveEvents()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+        universeObject.StateEnable.Enabled = true;
+
+        IActive? sender = null;
+        IActive.ActiveChangedArguments? arguments = null;
+
+        universeObject.OnActiveChanged.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        universeObject.StateEnable.Enabled = false;
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+
+        Assert.False(universeObject.IsActive);
+        Assert.True(arguments.Value.PreviousState);
+    }
+
+    [Fact]
+    public void NotActiveEvents()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+        universeObject.StateEnable.Enabled = false;
+
+        IActive? sender = null;
+        IActive.ActiveChangedArguments? arguments = null;
+
+        universeObject.OnActiveChanged.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        universeObject.StateEnable.Enabled = true;
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+
+        Assert.True(universeObject.IsActive);
+        Assert.False(arguments.Value.PreviousState);
+    }
+
+    [Fact]
+    public void SetName()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+        universeObject.Name = "Test";
+        Assert.Equal("Test", universeObject.Name);
+    }
+
+    [Fact]
+    public void SetNameEvents()
+    {
+        IUniverseObject universeObject = CreateUniverseObject();
+        universeObject.Name = "Previous";
+
+        INameable? sender = null;
+        INameable.NameChangedArguments? arguments = null;
+
+        universeObject.OnNameChanged.AddListener((s, a) =>
+        {
+            sender = s;
+            arguments = a;
+        });
+
+        universeObject.Name = "Test";
+
+        Assert.NotNull(sender);
+        Assert.NotNull(arguments);
+
+        Assert.Equal("Test", universeObject.Name);
+        Assert.Equal("Previous", arguments.Value.PreviousName);
+    }
+}

Engine.Tests/Engine.Tests.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Engine\Engine.csproj" />
+    <ProjectReference Include="..\Engine.Core\Engine.Core.csproj" />
+    <ProjectReference Include="..\Engine.Physics2D\Engine.Physics2D.csproj" />
+    <ProjectReference Include="..\Engine.Systems\Engine.Systems.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+</Project>

Engine.sln

@@ -19,7 +19,9 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "YamlDotNet", "Engine.Serial
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Integration", "Integration", "{823D4020-332D-2C13-F261-6F510F11A57E}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MonoGame", "Engine.Integration\Engine.Integration.MonoGame\Engine.Integration.MonoGame.csproj", "{C3438D33-0879-44E4-9DF0-D29F5621C44C}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Engine.Integration.MonoGame", "Engine.Integration\Engine.Integration.MonoGame\Engine.Integration.MonoGame.csproj", "{C3438D33-0879-44E4-9DF0-D29F5621C44C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Engine.Tests", "Engine.Tests\Engine.Tests.csproj", "{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -115,6 +117,18 @@ Global
 		{C3438D33-0879-44E4-9DF0-D29F5621C44C}.Release|x64.Build.0 = Release|Any CPU
 		{C3438D33-0879-44E4-9DF0-D29F5621C44C}.Release|x86.ActiveCfg = Release|Any CPU
 		{C3438D33-0879-44E4-9DF0-D29F5621C44C}.Release|x86.Build.0 = Release|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Debug|x64.Build.0 = Debug|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Debug|x86.Build.0 = Debug|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Release|x64.ActiveCfg = Release|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Release|x64.Build.0 = Release|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Release|x86.ActiveCfg = Release|Any CPU
+		{5FAE9C0F-39B9-4470-9E6B-08F764A03A08}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE