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CloseGathers the normal information into sourceRenderTexture.
This function collects the terrain mesh normalmap data from all Terrains in the PaintContext into sourceRenderTexture.
This function is called internally by TerrainPaintUtility.CollectNormals.
Important: There is no corresponding ScatterNormals function, because the normals are not stored, but calculated from the heightmap.
See Also: PaintContext, PaintContext.GatherHeightmap