glVIS

From DoomWiki.org

glVIS is a potentially visible set builder for OpenGL ports, developed by Jānis Legzdiņš, as a companion software for glBSP. The GL_PVS lumps it creates serve a purpose similar in a way to that of the REJECT lump, allowing the engines which use it to know which subsectors can be skipped by the renderer entirely. Vavoom, ZDoomGL, and Strife: Veteran Edition are known to make use of GL_PVS lumps.

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