# Sandbox.Terrain.UpdateCollision

```csharp
void UpdateCollision(SyncFlags flags, RectInt region)
```

Update the collider heights/materials from the current CPU data for a region.

### Parameters

- `flags` (`SyncFlags`)
- `region` (`RectInt`)

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