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Evaluating and Sampling Glinty NDFs in Constant Time

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Pauli Kemppinen, Lois Paulin, Theo Thonat, Jean-Marc Thiery, Jaakko Lehtinen, Tamy Boubekeur

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Evaluating and Sampling Glinty NDFs in Constant Time is a SIGGRAPH Asia 2025 ACM Transactions on Graphics paper by Pauli Kemppinen, Lois Paulin, Theo Thonat, Jean-Marc Thiery, Jaakko Lehtinen, and Tamy Boubekeur, presented on Tamy Boubekeur's paper page.

It covers glint rendering by representing faceted geometry as a 4D point process on an implicit multiscale grid so highlights can be found efficiently per pixel. Facet normals match microfacet NDFs such as GGX or Beckmann, and the method supports importance sampling, anisotropy, and colored particles without heavy memory or precomputation. A standalone GLSL fragment-shader base is linked via Shadertoy.

It is for advanced physically based rendering practitioners who implement specular glints and need constant-time evaluation and sampling. Readers should know microfacet BRDFs and importance sampling.

The page is free, with abstract, ACM Digital Library links, a large author preprint PDF, and a Shadertoy shader for experimentation.

It is useful when you want a self-contained paper landing page that pairs the glint NDF method with a runnable shader sketch. Link last verified accessible on 2026-09-29. Link last verified accessible on 2026-09-28.