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Fast Ray Tracing of Unevaluated Constructive Solid Geometry Models

  • P. Getto

Abstract

We present a refinement of the ray tracing algorithm, for use with unevaluated constructive solid geometry models. Bounding enclosures around the children of a part are combined into a tree with nearly optimal minimum expected number of extent-ray intersections. An approximate evaluation of the expression represented by the part can be evaluated on the enclosure-ray intersections to find the subset of children that might be hit by a ray. These candidate children are then used to evaluate the expression exactly. Several criteria are suggested which allow early termination of the exact expression evaluation.

Keywords

Union Operator Expression Tree Constructive Solid Geometry Auxiliary Tree Random Ball 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Tokyo 1989

Authors and Affiliations

  • P. Getto
    • 1
  1. 1.Rensselaer Design Research Center, Rensselaer Polytechnic InstituteG. M. Low Center for Industrial InovationTroyUSA

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