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authors Weghorst, H., Hooper, G., and Greenberg, D.
year 1984
title Improved Computational Methods for Ray Tracing
source ACM Trans. on Graphics, vol. 3, no. 1, pp. 52-69, Jan. 1984
summary This paper describes algorithmic procedures that have been implemented to reduce the computational expense of producing ray-traced images. The selection of bounding volumes is examined to reduce the computational cost of the ray-intersection test. The use of object coherence, which relies on a hierarchical description of the environment, is then presented. Finally, since the building of the ray-intersection trees is such a large portion of the computation, a method using image coherence is described. This visible-surface preprocessing method, which is dependent upon the creation of an "item buffer," takes advantage of a priori image information. Examples that indicate the efficiency of these techniques for a variety of representative environments are presented.
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