| sourceRect | 要复制的活动渲染纹理部分。 |
| dest | 要复制到其中的高度贴图纹理的 X 和 Y 坐标。 |
| syncControl | 控制如何执行 CPU 同步。 |
将活动 RenderTexture 的指定部分复制到地形高度贴图纹理。
此函数在内部调用 DirtyHeightmapRegion 并相应地发出 OnTerrainChanged 消息。
另请参阅：TerrainHeightmapSyncControl、DirtyHeightmapRegion、SyncHeightmap。
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