AcademySoftwareFoundation

AcademySoftwareFoundation/OpenPBR

Specification and reference implementation for the OpenPBR Surface shading model

Stars: 793
Forks: 44
Open beginner issues: 0
Indexed issues: 49

Dominant language: CSS
License: Apache-2.0
Last GitHub push: Apr 17, 2026
Latest indexed: Sep 14, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Open All

49 open issues indexed

Purpose of base_weight and specular_weight? Open

AcademySoftwareFoundation/OpenPBR#76 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Ability to tint specular highlights without affecting grazing angles Open

AcademySoftwareFoundation/OpenPBR#77 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Splitting specular_color between dielectric tint and metallic edge color Open

AcademySoftwareFoundation/OpenPBR#78 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Handling of raytraced subsurface entry/exit bounces Open

AcademySoftwareFoundation/OpenPBR#80 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Should non-physical tinting affect lower layers? Open

AcademySoftwareFoundation/OpenPBR#81 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Spec version metadata Open

AcademySoftwareFoundation/OpenPBR#83 · 5 comments · 1 reaction · 1 assignee · Indexed Sep 14, 2026
Fuzz normal when layered on top of coat Open

AcademySoftwareFoundation/OpenPBR#107 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
For consistency, every section should have a "weight" parameter. Open

AcademySoftwareFoundation/OpenPBR#134 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Better approximation for darkening layers under coat Open

AcademySoftwareFoundation/OpenPBR#136 · 17 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Suggest "presence" or "coverage" instead of "geometric_opacity" Open

AcademySoftwareFoundation/OpenPBR#138 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Suggest "0.18" as the default base_color Open

AcademySoftwareFoundation/OpenPBR#139 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Suggest separate parameters for diffuse and metal colours instead of "base_color" Open

AcademySoftwareFoundation/OpenPBR#140 · 19 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
question regarding color value range enforcement Open

AcademySoftwareFoundation/OpenPBR#149 · 51 comments · 3 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal: Fuzz/sheen can darken as well as lighten Open

AcademySoftwareFoundation/OpenPBR#176 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add formula for the average albedo of the F82-tint model Open

AcademySoftwareFoundation/OpenPBR#187 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Proposal: Remove uifolder prefix from uiname strings Open

AcademySoftwareFoundation/OpenPBR#219 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
Coat and Fuzz parameter order inconsistent between specification and reference implementation Open

AcademySoftwareFoundation/OpenPBR#223 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Suggest Hoffman approximations for Fresnel factor of metal under coat/film Open

AcademySoftwareFoundation/OpenPBR#225 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Give an explicit suggested formula for fuzz base-roughening Open

AcademySoftwareFoundation/OpenPBR#226 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026
MaterialX: implement view-dependent coat absorption Open

AcademySoftwareFoundation/OpenPBR#233 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
MaterialX: implement bump mapping for fuzz Open

AcademySoftwareFoundation/OpenPBR#234 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
MaterialX: support thin-walled dielectric Open

AcademySoftwareFoundation/OpenPBR#237 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Account for coat IOR in base roughening Open

AcademySoftwareFoundation/OpenPBR#239 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Realtime use case affordances Open

AcademySoftwareFoundation/OpenPBR#241 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Support for Ambient Occlusion maps Open

AcademySoftwareFoundation/OpenPBR#242 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Represent retro-reflective materials Open

AcademySoftwareFoundation/OpenPBR#243 · 13 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Folding More Standards Into OpenPBR Open

AcademySoftwareFoundation/OpenPBR#244 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Add more implementation guidance for thin-film iridescence Open

AcademySoftwareFoundation/OpenPBR#246 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Update Markdeep version Open

AcademySoftwareFoundation/OpenPBR#249 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Clarify the coat absorption behaviour for partial coverage Open

AcademySoftwareFoundation/OpenPBR#252 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Some more openPBR example mtlx file that support texture maps? Open

AcademySoftwareFoundation/OpenPBR#259 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Capitalize all equation names Open

AcademySoftwareFoundation/OpenPBR#263 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Dual lobe phase function for SSS Open

AcademySoftwareFoundation/OpenPBR#264 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
`transmission_dispersion_scale` -> `transmission_dispersion` ? Open

AcademySoftwareFoundation/OpenPBR#266 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
TODOs following SIGGRAPH write-ups Open

AcademySoftwareFoundation/OpenPBR#269 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
State orthonormalization policy for input normals and tangents Open

AcademySoftwareFoundation/OpenPBR#274 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Change `transmission_scatter` to control scatter albedo directly Open

AcademySoftwareFoundation/OpenPBR#275 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Table of Contents section numbers Open

AcademySoftwareFoundation/OpenPBR#279 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
`emission_luminance` soft-max should be higher than its default Open

AcademySoftwareFoundation/OpenPBR#280 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Use UI name "Scatter Anisotropy" in the Transmission section Open

AcademySoftwareFoundation/OpenPBR#281 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Refactor layer structure to have gloss sit on top of the entire dielectric base Open

AcademySoftwareFoundation/OpenPBR#282 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
MaterialX OpenPBR Surface node definition natural logarithm (ln) function could be undefined Open

AcademySoftwareFoundation/OpenPBR#291 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Fix Changelog formatting. Open

AcademySoftwareFoundation/OpenPBR#294 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Anisotropy: Bug in the derivation of the or wrong assumption about the resulting $a_t$ and $a_b$ Open

AcademySoftwareFoundation/OpenPBR#306 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Unspecified default unit for length parameters such as `subsurface_radius` and `transmission_depth` Open

AcademySoftwareFoundation/OpenPBR#308 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Text about decoupled reflection highlight and refraction direction unclear Open

AcademySoftwareFoundation/OpenPBR#310 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
specular_color tinting of internal reflections is inconsistent in the reference MaterialX graph (TIR untinted, partial internal reflection tinted) Open

AcademySoftwareFoundation/OpenPBR#311 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Clarify thin-walled mode: the flip/mirror model and sidedness Open

AcademySoftwareFoundation/OpenPBR#312 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Clamp metallic Fresnel after `specular_weight` scaling via F0 and F82 Open

AcademySoftwareFoundation/OpenPBR#314 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026

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