Model/Texture problem? (maya or c4d)

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You have to merge the meshes together, so the body, eyes and mouth are one single mesh, and then you weld (again), I think - at least I got it solved that way (though on 3ds max). I wondered about this at first, too - But in the end, it makes sense that vertices can only be smoothed by welding when they're in the same mesh.
They're put into seperate meshes in the rips because they use different textures and thus were ripped as seperate parts.