Sampling Visible GGX Normals with Spherical Caps

Author:

Dupuy Jonathan1ORCID,Benyoub Anis1ORCID

Affiliation:

1. Intel Corporation

Abstract

AbstractImportance sampling the distribution of visible GGX normals requires sampling those of a hemisphere. In this work, we introduce a novel method for sampling such visible normals. Our method builds upon the insight that a hemispherical mirror reflects parallel light rays uniformly within a solid angle shaped as a spherical cap. This spherical cap has the same apex as the hemispherical mirror, and its aperture given by the angle formed by the orientation of that apex and the direction of incident light rays. Based on this insight, we sample GGX visible normals as halfway vectors between a given incident direction and directions drawn from its associated spherical cap. Our resulting implementation is even simpler than that of Heitz and leads to systematic speed‐ups in our benchmarks.

Publisher

Wiley

Subject

Computer Graphics and Computer-Aided Design

Reference28 articles.

1. Microsurface Transformations

2. arXiv:https://onlinelibrary.wiley.com/doi/pdf/10.1111/cgf.14590

3. doi:https://doi.org/10.1111/cgf.14590. 5

4. doi:10.1145/3214834.3264541. 1

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1. TraM‐NeRF: Tracing Mirror and Near‐Perfect Specular Reflections Through Neural Radiance Fields;Computer Graphics Forum;2024-07-08

2. Bounded VNDF Sampling for the Smith-GGX BRDF;Proceedings of the ACM on Computer Graphics and Interactive Techniques;2024-05-11

3. Bounded VNDF Sampling for Smith–GGX Reflections;SIGGRAPH Asia 2023 Technical Communications;2023-11-28

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