I am attempting to create a pane of glass that refracts light as though it were
a prism.

Consider this attempt that didn't work.

object{
  box{<10,1/2,10>, -<10,1/2,10> }
  texture{T_Glass3}
  interior{ ior 1.5 dispersion 2.4 dispersion_samples 150  caustics 0.4 }
  normal{function{0.1*z}}
  photons{target refraction on reflection on}
}

I have tried many different settings and the problem seems to be in the normal
statement.

I want the stars on the other side of the glass to be dispersed along the z
direction similar to this attempt http://goo.gl/i2gfS

This is the closest I have gotten, using bumps in the normal statement
http://goo.gl/OfEIq

I want the faces of the pane of glass to behave as if they are pointed in a
specific direction.... how do i do this?

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