This asset will help you to convert from Metal/Rough to Spec/Gloss inside of substance painter.
Why this is helpful? Well, first reason: Spec/Gloss is more advanced shader system than Metal/Rough but it is really hard to work with Spec/Gloss, because we need to concentrate on diffuse and specular colour at the same time. Second reason: Spec/Gloss have ability to use different colour for diffuse and specular, so we can create really interesting textures with it.
So, that is why I created this generator and filter. Now we can work in Metal/Rough workflow and get Spec/Gloss output! Nice isn't it? :)
Tutorial on how to use it inside of the archive.