# Change existing height with effects

> Flatten or sharpen the terrain or add contrast between heights. These tools are only available in the Terrain Tools package.

> **Note:**
>
> These tools are only available in the [Terrain Tools package](https://docs.unity3d.com/Packages/com.unity.terrain-tools@latest/).

The height effect tools change existing height features.

| Tool                                                                                                                              | Description                                                     |
| --------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- |
| [Flatten terrain features](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-effects/flatten.md)  | Flatten fine details on the terrain without changing the slope. |
| [Change peak sharpness](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-effects/sharpen.md)     | Sharpen existing peaks and flatten the areas around them.       |
| [Add contrast to features](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-effects/contrast.md) | Raise high areas and lower low areas at the same time.          |

## Additional resources

* [Primary sculpting tools](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-basic-sculpting.md)
* [Advanced sculpting tools](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-sculpt.md)
* [Transform terrain features](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-transform.md)
* [Erode the terrain](/engine/6000.7/manual/creating-environments/script-terrain/terrain-height/terrain-erosion.md)