| editorUndoName | 用于撤销堆栈的唯一名称。 |
通过将修改复制回源地形瓦片，应用已编辑的 Alpha 贴图 PaintContext。
完成对 PaintContext 的编辑后，destinationRenderTexture 中的已修改数据必须应用于每个地形中存储的纹理。
ScatterAlphamap 将执行此复制，然后将其他 Alpha 贴图通道重新标准化，从而维持总和 1。
此函数还将创建一个延迟操作来重新构建基础贴图 LOD 纹理。
TerrainPaintUtility.EndPaintTexture 在内部调用此函数。
另请参阅：PaintContext.GatherAlphamap 和 PaintContext.ApplyDelayedActions。
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