在相机完成场景的渲染后被调用。
OnPostRender: Called after a camera finishes rendering the scene.
这就需要一些方法加速对大规模场景的渲染，如可见性裁减等。
Some visibility culling algorithms like the one based on cell and portal can be used to accelerate it.
建模是本卷的一部分，而不是我们专心3d场景的渲染和物质方面的。
Modelling is not part of this volume, instead we concentrate solely on the rendering and material aspects of the 3d scene.
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