On Fri, 28 Apr 2000 23:38:14 -0500, Bob Hughes wrote:
>Thing is that when ior was moved to 'interior' there became no
>way of mapping a variable refraction.  It could be done in POV v3.0*
>but not now in v3.1.  How? you might ask.  By using 'texture_map',
>which had refraction in 'finish'.

To be fair, though, the method in 3.0 wouldn't have been anything like
accurate.  Refraction is only calculated on entry and exit; variable
IOR requires it to be calculated continuously over the path of the ray.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
These are my opinions.  I do NOT speak for the POV-Team.

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