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by Pathogen-David 515 days ago
You might find value in the glTF sample renderer https://github.com/KhronosGroup/glTF-Sample-Renderer

It won't be plug and play since you'd have to pull out the shaders and make them work in your app, but the implementation supports quite a few material variants. The PBR shader implementation starts in source/Renderer/shaders/pbr.frag