Fast ray tracing of sequences by ray history evaluation

Abstract

W e present a method t o reduce the tame needed t o render a sequence of ray traced zmages. W e exploit the temporal an,d spataal coherence between consecutive frames. The algorithm does not only inspect the am,-age plane in order t o find regions with minor changes; the object space is analysed by evaluating the so called ray history. With this method we obtain a speedup zn the range of 1.2 t o 2.8 almost without visible loss of quality. The method is more or less independent of the used ray trace algorithm and can be implemented zn many ray trace programs without too mvch efort.