How to use different work flow to get different material parameter

[JayChang-zhe]

I was trying to get the different material parameter with Assimp 5.2.3,something like: Metallic, Roughness, Specular etc, inside the material.h I can see two work flow which is Metallic/Roughness Workflow & Specular/Glossiness Workflow, but when i get the value, it's always different, or i need to get and calculate? Don't really know how to get it and how to use those two workflow, is there any doc to get? Thanks in advance

[kimkulling]

The workflow is pretty simple:

    aiColor4D diffuse = {};
    if (aiGetMaterialColor(material, AI_MATKEY_COLOR_DIFFUSE, &diffuse) == AI_SUCCESS ) {
        setColor4(...);
    }