# usePhysicsLayers

> Get if the option of _usePhysicsLayers is active or not. If no PhysicsCoreSettings2D asset is assigned, this option will return false (inactive). When active, the physics 64-bit layers are used (see _physicsLayerNames ) for property drawers and PhysicsLayers.GetLayerMask. When inactive, the 32-bit layers are used (see 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.

## Definition

* **Type:** Property
* **Namespace:** [Unity.U2D.Physics](/engine/6000.6/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public static bool usePhysicsLayers { get; }
```