# HeightOnly

> Synchronizes only height data of the heightmap texture from the GPU back to CPU memory.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.3/script-reference/unityengine.md)
* **Assembly:** UnityEngine.TerrainModule

```csharp
HeightOnly = 1
```

### Remarks

This option forces the tessellation level to maximum on the modified heightmap region. Use [TerrainData.SyncHeightmap](/engine/6000.3/script-reference/unityengine/terraindata/syncheightmap.md) afterward to rectify the tessellation.