# sphereRadius

> The radius of the sphere used for culling ray tracing instances associated with the Renderers in a Scene.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Rendering](/engine/6000.7/script-reference/unityengine/rendering.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
public float sphereRadius
```

### Remarks

To enable sphere culling, use [RayTracingInstanceCullingFlags.EnableSphereCulling](/engine/6000.7/script-reference/unityengine/rendering/raytracinginstancecullingflags/enablesphereculling.md) flag in [RayTracingInstanceCullingConfig.flags](/engine/6000.7/script-reference/unityengine/rendering/raytracinginstancecullingconfig/flags.md).

Additional Resources: [RayTracingAccelerationStructure](/engine/6000.7/script-reference/unityengine/rendering/raytracingaccelerationstructure.md).