A graphics processor having an independent processor for traversing a hierarchical graphics data base. The independent processor, termed a "tree traverser", generates a stream of addresses to the memory in which the data base is stored, producing a stream of data over a private, unidirectional data path...http://www.google.co.uk/patents/US4967375?utm_source=gb-gplus-sharePatent US4967375 - Fast architecture for graphics processor
