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This is the source code of qbsp and vis: Quake preprocessing tools. They have been modified in order to trace the portal building system and the PVS building systems. Quake 1 maps have been released as GPL by John Romero on October 12, 2006 (In honour of Quake's 10th year). You can also use Q3Radiant: It features a built-in viewprt Portal Viewer that work on Quake1 files.