Extending graphics hardware for occlusion queries in OpenGL
Dirk Bartz, Michael Meißner, Tobias Hüttner · 1998
For intcractivc rendering of large polygonal objects, fast visibility qucrics arc ncccssary to quickly decide whether polygonal objccts arc visible and need to bc rcndcrcd.None of the numerous published algorithms provide visibility pcrthrmancc for interactive rcndcring of large models.In this paper, wc propose an OpcnGI> extension for fast occlusion queries.Added after the depth test stage of the OpenCiL rcnderillg pipclinc.our algorithm provides fast queries to establish the occlusion of polygonal ob.jccts.Furthermore, hardware aspects of this proposal are discussed and possible implementations on two diffcrcnt graphics architectures arc presented.