# Sandbox.ScreenSpaceReflections.RoughnessCutoff

```csharp
float RoughnessCutoff { get; set; }
```

Stop tracing rays after this roughness value. 
This is meant to be used to avoid tracing rays for very rough surfaces which are unlikely to have any reflections.
This is a performance optimization.

Declared in [Sandbox.ScreenSpaceReflections](/api/Sandbox.ScreenSpaceReflections).
Assembly: `Sandbox.Engine`.