# RayTracingInstanceCullingResults

> A structure containing results of the culling operation performed by RayTracingAccelerationStructure.CullInstances.

## Definition

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

```csharp
public struct RayTracingInstanceCullingResults
```

## Remarks

Note that [RayTracingAccelerationStructure.CullInstances](/engine/6000.7/script-reference/unityengine/rendering/raytracingaccelerationstructure/cullinstances.md) has already added ray tracing instances to the acceleration structure based on input parameters.

## Fields

| Value                                                                                                                            | Description                                                                                                                                                                                                                                                                                                                                                                                            |
| -------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [materialsCRC](/engine/6000.7/script-reference/unityengine/rendering/raytracinginstancecullingresults/materialscrc.md)           | An array of Material CRC and instance id pairs generated by [RayTracingAccelerationStructure.CullInstances](/engine/6000.7/script-reference/unityengine/rendering/raytracingaccelerationstructure/cullinstances.md) when using [RayTracingInstanceCullingFlags.ComputeMaterialsCRC](/engine/6000.7/script-reference/unityengine/rendering/raytracinginstancecullingflags/computematerialscrc.md) flag. |
| [transformsChanged](/engine/6000.7/script-reference/unityengine/rendering/raytracinginstancecullingresults/transformschanged.md) | This property is true if a Renderer in the Scene changed its Transform during the last frame. Renderers that use Ray Tracing Mode Off are not taken into account.                                                                                                                                                                                                                                      |