https://sgvr.kaist.ac.kr/publication/interactive-view-dependent-rendering-with-conservative-occlusion-culling-in-complex-environments/
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https://sgvr.kaist.ac.kr/publication/interactive-visibility-culling-for-complex-environments-using-occlusion-switches/
ACM SIGGRAPH Symposium on Interactive 3D Graphics (I3D), 2003