现在的HSR算法基本上可以分为四种：backface culling、frustum culling、portal culling、occlusion culling。-HSR algorithm is basically divided into four: backface culling, frustum culling, portal culling, occlusion culling.

游戏编程中的闭塞裁剪, 遮挡裁剪,Occlusion Culling

Pixie is a photorealistic renderer that uses a RenderMan-like interface. Features include programmable shading, motion blur, depth of field, raytracing, scan-line rendering, occlusion culling, global illumination, caustics -Pixie is a photorealistic

only simple occlusuon culling