# Sandbox.LightModulator.ScrollSpeed

```csharp
Vector2 ScrollSpeed { get; set; }
```

Scroll effect movement in repeats per second along U and V. Zero leaves the projection still.
Runs in the shader without rebuilding textures or light candidate lists each frame.

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