Circular shape resource for 2D physics.
2D circular shape to be added as a direct child of a PhysicsBody2D or Area2D using a CollisionShape2D node. This shape is useful for modeling balls or small characters and its collision detection with everything else is very fast.
Performance: Being a primitive collision shape, CircleShape2D is the fastest collision shape to check collisions against, as it only requires a distance check with the shape's origin.
float radius =
The circle's radius.