Umbra lets you emphasize the intensity of shadows in the area fully protected by the direct rays shot by the lighting source : the light transition between fully shadowed areas and fully lit areas change more quickly 日蚀允许你增强被光源发射直接光线包围的区域中的阴影深度：在完全阴影区域和完全照亮区域之间，光线急剧转换。
