# IgnoreRaycastLayer

> Layer mask constant to select ignore raycast layer.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.6/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

```csharp
public const int IgnoreRaycastLayer = 4
```

### Remarks

This can be used in the layermask field of [Physics.Raycast](/engine/6000.6/script-reference/unityengine/physics/raycast.md) and other methods to select the "ignore raycast" layer (which does not receive raycasts by default).

Additional Resources: [Physics.AllLayers](/engine/6000.6/script-reference/unityengine/physics/alllayers.md), [Physics.DefaultRaycastLayers](/engine/6000.6/script-reference/unityengine/physics/defaultraycastlayers.md).