| sourceRect | The part of the active Render Texture to copy. |
| dest | The X and Y coordinates of the heightmap texture to copy into. |
| syncControl | Controls how CPU synchronization is performed. |
Copies the specified part of the active RenderTexture to the Terrain heightmap texture.
This functions calls DirtyHeightmapRegion internally and sends out the OnTerrainChanged message accordingly.
Additional resources: TerrainHeightmapSyncControl, DirtyHeightmapRegion, SyncHeightmap.