I downloaded an fbx which came with a diffuse and normal map along with a third map which I really don't know what it is.
Also, how would I hook this up to a Principled BSDF?
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4$\begingroup$ Most likely it is an image composed of 3 black and white images which were put into 3 color channels of this image, one into R, another into blue etc. One can only guess what exactly those initial images were for, it depends on project quite a bit. It could be roughness + metallic + ambient occlusion, but not necessarily $\endgroup$ – Mr Zak Aug 6 '19 at 20:12
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$\begingroup$ Thanks for the info, I guess I'll have to try a few things. $\endgroup$ – Dr. Stephen Strange Aug 6 '19 at 20:36
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I am not sure what the texture is, but the color needs to go to Metallic, Specular, and Anistropic with the alpha in the roughness.
