语言支持

As mentioned above in the directional lights section, the rendering of shadows for directional lights is an approximation that allows us to use a single render to cover a largeish area with shadows.

你也可以使用着色语言作为技术的实现基础来处理投射收的材质来实现更复杂的算法，比如实现支持自投的深贴图。