获取和设置是否为此材质启用双面全局光照设置。
启用时,光照贴图会在计算全局光照时考虑几何形状的两面。背面不会渲染或添加到光照贴图,但是在从其他对象查看时会被视为有效。使用渐进光照贴图时,背面使用与正面相同的发射和反照率来反射光。 (当前此设置仅在使用渐进光照贴图后端进行烘焙时可用。)
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