Deep Coherent Ray Tracing

  • Authors:
  • Erik Mansson;Jacob Munkberg;Tomas Akenine-Moller

  • Affiliations:
  • Lund University/TAT AB, e-mail: erik.mansson@tat.se;Lund University, e-mail: jacob@cs.lth.se;Lund University, e-mail: tam@cs.lth.se

  • Venue:
  • RT '07 Proceedings of the 2007 IEEE Symposium on Interactive Ray Tracing
  • Year:
  • 2007

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Abstract

Tracing secondary rays, such as reflection, refraction and shadow rays, can often be the most costly step in a modern real-time ray tracer. In this paper, we examine this problem by using suitable ray coherence measures and present a thorough evaluation of different reordering heuristics for secondary rays. We also present a simple system design for more coherent scene traversal by caching secondary rays and using sorted packet-tracing. Although the results are only slightly incremental to current research, we believe this study is an interesting contribution for further research in the field.