Sort by depth for painter's algorithm.

画家的深度排序算法。

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To do that, use camera origin point and triangle edges to split original triangles into several sub-regions, then check if regions conform to established sort order (prepared for painter's algorithm).

要做到这一点，使用相机的原点和原三角形三角形边分割成若干个子区域，然后检查如果地区符合规定的排序顺序(准备画家算法)。

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