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arXiv:2410.18026cs.GR

EON: A practical energy-preserving rough diffuse BRDF

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.

arXiv comments
Add appendix with albedo inversion formulas
Journal reference
Journal of Computer Graphics Techniques (JCGT), vol. 14, no. 1, 116-139, 2025
DOI
Subjects
cs.GRGraphics

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