ogre
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Blinn Phong physical BRDF
- must follow energy conservation/ fresnel rules
- should still work with blinn phong values as defined in current scripts.
- needs some value conversion
- http://simonstechblog.blogspot.com/2011/12/microfacet-brdf.html
- https://github.com/mrdoob/three.js/tree/dev/src/renderers/shaders/ShaderChunk
https://github.com/AnalyticalGraphicsInc/obj2gltf/blob/7d43c32422435ef6a4101550b4144b21429c4a23/lib/loadMtl.js#L733-L755