Retsam <nomail@nomail> wrote:
> Since a mesh object has no inside, how can I make it so that
> light travelling the other way will enter "glass" when it exits the water?

  IOR calculations don't need solid objects.
  You can perfectly make a glass object which is actually a mesh or made of
bicubic patches.
  Naturally the IOR calculation routine expects the surface to be well-behaved
and closed, but you shouldn't expect a non-closed mesh to work ok anyways.

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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