Groene, AlwinRenz, OliverP F Lister2014-02-062014-02-061992--https://doi.org/10.2312/EGGH/EGGH92/077-094Even on the latest workstations ray tracing is still a very time-consuming algorithm.This paper makes a thorough analysis of previous attempts to accelerate raytracing by means of parallelization with general purpose processors and by means of designing special purpose processors. Since much work has been done concurrently by many researchers, only the most important milestones are mentioned. The conclusionsdrawn are quite different from those in many other papers.