Indicates if the option of PhysicsLowLevelSettings2D.useFullLayers is active or not. If no PhysicsLowLevelSettings2D asset is assigned, this option will return false (inactive). When active, the 64-bit layers are used (see PhysicsLowLevelSettings2D.physicsLayerNames) for property drawers and PhysicsLayers.GetLayerMask. When inactive, the 32-bit layers are used (see UnityEngine.LayerMask) for property drawers and PhysicsLayers.GetLayerMask. In all cases, the physics system itself will always use the full 64-bit layers assigned, however when using 32-bit layers, the top 32-bits will be set to zero.