diff --git a/Engine.Physics2D/Collider2DCircleBehaviour.cs b/Engine.Physics2D/Collider2DCircleBehaviour.cs
index 38991c5..a11be89 100644
--- a/Engine.Physics2D/Collider2DCircleBehaviour.cs
+++ b/Engine.Physics2D/Collider2DCircleBehaviour.cs
@@ -11,4 +11,12 @@ public class Collider2DCircleBehaviour : Collider2DBehaviourBase, ICircleCollide
 
 
     public override void CalculateCollider() => CircleWorld = Transform.TransformCircle(CircleLocal);
+
+
+    public Collider2DCircleBehaviour() { }
+    public Collider2DCircleBehaviour(Circle circle)
+    {
+        CircleLocal = circle;
+        Recalculate();
+    }
 }
diff --git a/Engine.Physics2D/Collider2DShapeBehaviour.cs b/Engine.Physics2D/Collider2DShapeBehaviour.cs
index 9a0794c..ca2b076 100644
--- a/Engine.Physics2D/Collider2DShapeBehaviour.cs
+++ b/Engine.Physics2D/Collider2DShapeBehaviour.cs
@@ -11,4 +11,12 @@ public class Collider2DShapeBehaviour : Collider2DBehaviourBase, IShapeCollider2
     protected Shape _shapeWorld = new([new(1f, 1f), new(-1f, 1f), new(-1f, -1f), new(1f, -1f)]);
 
     public override void CalculateCollider() => Transform.TransformShape(ShapeLocal, ref _shapeWorld);
+
+
+    public Collider2DShapeBehaviour() { }
+    public Collider2DShapeBehaviour(Shape shape)
+    {
+        ShapeLocal = shape;
+        Recalculate();
+    }
 }