| inputLayer | 用于绘制的 TerrainLayer。 |
| addLayerIfDoesntExist | 设置为 true 可以指定在 inputLayer 尚不存在时将其添加到该地形。设置为 false 可以指定不将地形层添加到该地形。 |
将 Alpha 贴图信息收集到 sourceRenderTexture 中。
此函数将 PaintContext 中所有地形瓦片的 Alpha 贴图数据收集到 sourceRenderTexture 中。
TerrainPaintUtility.BeginPaintTexture 在内部调用此函数。
另请参阅：PaintContext.ScatterAlphamap。
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