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Physically Based Rendering: From Theory to Implementation

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218 points ahamez | 1 comments | 13 Jan 25 14:28 UTC | HN request time: 0s | source
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phkahler ◴[16 Jan 25 17:49 UTC] No.42728459[source]▶
Is there a standard OpenGL (ES3) shader I can drop in a GPLed application that uses a decent (is there a standard?) BRDF similar to Schlick with red,green,blue, and roughness?

I've wanted to add this capability to Solvespace for a while. I did my own implementation with the Fresnel term and it looked OK, but I want something "standard" and correct.

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1. jms55 ◴[16 Jan 25 18:40 UTC] No.42729134[source]▶
There is no standard.

Filament is extremely well documented: https://google.github.io/filament/Filament.html

glTF's PBR stuff is also very well documented and aimed at realtime usage: https://www.khronos.org/gltf/pbr/

OpenPBR is a newer, much more expensive BRDF with a reference implementation written in MaterialX that iirc can compile to glsl https://academysoftwarefoundation.github.io/OpenPBR

Pick one of the BRDFs, add IBL https://bruop.github.io/ibl, and you'll get decent results for visualization applications.