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EON: A practical energy-preserving rough diffuse BRDF

Graphics 2026-01-01 v3
Authors: Jamie Portsmouth , Peter Kutz , Stephen Hill
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Abstract

We introduce the "Energy-preserving Oren--Nayar" (EON) model for reflection from rough surfaces. Unlike the popular qualitative Oren--Nayar model (QON) and its variants, our model is energy-preserving via analytical energy compensation. We include self-contained GLSL source code for efficient evaluation of the new model and importance sampling based on a novel technique we term "Clipped Linearly Transformed Cosine" (CLTC) sampling.

Cite

@article{arxiv.2410.18026,
  title  = {EON: A practical energy-preserving rough diffuse BRDF},
  author = {Jamie Portsmouth and Peter Kutz and Stephen Hill},
  journal= {arXiv preprint arXiv:2410.18026},
  year   = {2026}
}

Comments

Add appendix with albedo inversion formulas

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R2 v1 2026-06-28T19:33:07.456Z