copy-paste error：the second lightmapColor should be lightmapDir

[MilkyW]

in void CheckResources()

				if (lightmapData.lightmapDir != null)
				{
					var textureDetail = GetTextureDetail(lightmapData.lightmapColor);   // should be lightmapDir

					if (!ActiveTextures.Contains(textureDetail))
						ActiveTextures.Add(textureDetail);
				}