延迟光照（旧版）。
这是延迟光照路径（也称为“光照预通道”），
它两次将场景信息渲染进一个非常小的 G 缓冲区，在两次之间计算光照。
它不需要 GPU 具有多渲染目标 (MRT) 支持，但
灵活性比 RenderingPath.DeferredShading 要低。
注意：延迟渲染与正交摄像机投影不兼容。
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