# Sandbox.Surface.SplatterData.FadeIn

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

How long the decal's height coverage takes to grow in. 0 shows it with no fade-in transition. Decals must have a valid heightmap to use this effect.

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