Efficient BRDF importance sampling using a factored representation

Jason Lawrence, Szymon Rusinkiewicz, Ravi Ramamoorthi

Research output: Contribution to journalConference article

95 Scopus citations

Abstract

High-quality Monte Carlo image synthesis requires the ability to importance sample realistic BRDF models. However, analytic sampling algorithms exist only for the Phong model and its derivatives such as Lafortune and Blinn-Phong. This paper demonstrates an importance sampling technique for a wide range of BRDFs, including complex analytic models such as Cook-Torrance and measured materials, which are being increasingly used for realistic image synthesis. Our approach is based on a compact factored representation of the BRDF that is optimized for sampling. We show that our algorithm consistently offers better efficiency than alternatives that involve fitting and sampling a Lafortune or Blinn-Phong lobe, and is more compact than sampling strategies based on tabulating the full BRDF. We are able to efficiently create images involving multiple measured and analytic BRDFs, under both complex direct lighting and global illumination.

Original languageEnglish (US)
Pages (from-to)496-505
Number of pages10
JournalACM Transactions on Graphics
Volume23
Issue number3
DOIs
StatePublished - Dec 1 2004
EventACM Transactions on Graphics - Proceedings of ACM SIGGRAPH 2004 -
Duration: Aug 9 2004Aug 12 2004

All Science Journal Classification (ASJC) codes

  • Computer Graphics and Computer-Aided Design

Keywords

  • BRDF
  • Global Illumination
  • Importance Sampling
  • Monte Carlo Integration
  • Ray Tracing
  • Rendering

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