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.
你也可以使用语言作为技术
实现基础来处理阴
投射体和接收体
材质来实现更
阴
算法,比如实现支持自投
深度阴
贴图。