unity3d —— 层

渲染指定层

EX：

 _cameraL.cullingMask = 1 << 0 | 1 << 1 | 1 << 2 | 1 << 3 | 1 << 4 | 1 << 5 | 1 << 6 | 1 << 7 | 1 << 8 | 1 << 9 | 1 << 10 | 1 << 31;