旧ディファードライティング
This is a deferred lighting path (also known as "light pre-pass"), that
renders scene information into a very small G-Buffer twice, computing lighting in between.
It does not require a GPU with multiple render targets (MRT) support, but is a lot
less flexible than RenderingPath.DeferredShading is.
ディファードレンダリングは、正投影のカメラに使用できません。