orthogonal intersection cast shadow matrix

• 正交投影矩阵

orthogonal intersection cast shadow matrix的用法和样例：

例句

1. Clipping is performed after the projection matrix is applied.
   剪辑在应用投影矩阵后执行。
2. Otherwise feel free to roll your own projection matrix e.t.c.
   当然你也可以自行设置投影矩阵。