Hi, I'm going to pile on here, because I think I have a similar question and I've not been able to find the answer yet. In FireFly, for the last thousand years or so, if I wanted to render a single material zone invisible, Transparency = 1.00 and no spec/ambience/etc. did the trick. For example, if the materials on a tree consist of leaf and bark, and you want a wintertime tree, make the leaves transparent and you're there. That clearly does not work with the Poser Surface in SuperFly. In the tree example, I end up with peculiar clumps of black here and there. I've tried different light sets and different types of lighting, so I don't think it's a lighting artifact (or at least, not solely a lighting artifact). I've tried both the Cycles and Physical Surface configurations shown above in this thread... same issue still applies: clumps of black. Something is still getting picked up in the ray trace. Is this impossible to do in SuperFly without eliminating the object's ability to cast shadows? Any thoughts? Thanks!