# Sandbox.Decal.CoverageAmount

```csharp
ParticleFloat CoverageAmount { get; set; }
```

Adjusts the opacity mask based on the height map. At 1 decal is fully visible, and at 0 it goes invisible.
This setting requires a valid height map on your decals.

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