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.
为解决大规模场景中绘制实时阴影的问题，提出优化的阴影体算法。
An optimized shadow volume algorithm was developed to render shadow in large-scale scene.
采用基于视截体分层的方法进行大规模场景阴影绘制时，需要考虑分层的合理性与阴影的图像质量。
It is necessary to consider the reasonableness of split and the quality of shadow image when drawing shadow based on the view frustum split in a large scale scenes.
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