I have used a polarized workflow in a related field and you need polarized light ONLY and a filter on the camera, and everything setup properly for it to work. The filter on the camera takes out some reflections and spec but the only way to get NO SPEC is to to put polarizing gel over the flash units and not have any other light present. I have no tried this for 3d scanning yet but will next week, I anticipate other problems popping up (As in high spec objects will be almost jet black, like when I used this workflow on handguns, the metal was almost jetblack, as the majority of the objects diffuse is spec-based...)