（只读）用于存储地形瓦片原始数据的渲染目标。
此 RenderTexture 包含从 PaintContext 相交的所有地形瓦片收集的所有数据。
RenderTexture 由 PaintContext.CreateRenderTargets 创建，并由 Gather 函数之一（PaintContext.GatherHeightmap、PaintContext.GatherAlphamap 或 PaintContext.GatherNormals）填充。
另请参阅：PaintContext、PaintContext.destinationRenderTexture。
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