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I contributed a tiny bit to pbrt[1], and one of the things I loved was that if you just plugged in physical values you almost always got great results with minimal tweaking.

The Octane data seems most complete at first glance (with complex IOR etc), but for things like milk and blood I expected at the very least some absorption coefficient for the translucency or similar.

[1]: https://pbrt.org/

Creating fragment shaders from scratch

I'm just building ray tracers from scratch mostly and having raw BRDF data would make that easier.