Oh and I didn't use any atmosphere.. so whatever the default Poser atmosphere is..

Luke the cone is just a simple cone. UVmapped as a cylinder. It should be one sided, and have the normals facing outwards as far as I know... not sure if that was what you meant. I agree that you can see the "inside" of it since it's partially transparent, but OTOK.. shouldn't it be showing on the backfacing parts and not in front of Simon then?

I'll try a render without Simon and see...

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.