Function PhysicsBody2D.collisionLayer

The physics layers this area is in. Collidable objects can exist in any of 32 different layers. These layers work like a tagging system, and are not visual. A collidable can use these layers to select with which objects it can collide, using the collisionMask property. A contact is detected if object A is in any of the layers that object B scans, or object B is in any layer scanned by object A.

long collisionLayer() nothrow @property @nogc;

void collisionLayer (
  long v
) nothrow @property @nogc;