What’s the best order to put a diffuse, normal and specular maps on a VTF film on VTFEdit?
Use a single VTF for the diffuse and specular, using the alpha channel for the specular, then use another one for the normal map.
You can read how to use the alpha for specular here: https://developer.valvesoftware.com/wiki/$envmapmask
You can download an addon for photoshop or gimp for them to work with VTFs if I am not wrong, that will allow you to set a white and black image as their alpha.
Depends what you want the specularity for.
If you want to use the specularity on envmap, as a reflection map, then it goes into the alpha channel of the diffuse.
If you want to use the specularity on phong, as a $phongboost map, then it goes into the alpha channel of the normal.
If you want to use the specularity on phong, as a $phongexponent map, then it gets its own separate texture and is pulled into the material via $phongexponenttexture.
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