Update on dispersion patch...

The patch I provided not only adds dispersion, but also trig-degree
functions (sind, cosd, etc. that take/return degrees instead of
radians), and whatever else I had announced.

I failed to notice, though, that it also changes the mosaic preview step
size from a factor of two to a factor of three. This is a personal
preference of mine.  

Two people are working on binaries for Windows and Mac, and unlike
Linux, which is all I use, these platforms need to reset certain
variables before each render.  Solution: "...we had to set the variable
disp_elem and disp_nelems to zero in the function init_vars() in
povray.c"

But there were also some weird bugs that we haven't tracked down.  

Bottom line: dispersion patch *may* have a bug, so use with caution.

-- 
Daren Scot Wilson
dar### [at] pipelinecom 
www.newcolor.com
----
"A ship in a harbor is safe, but that is not what ships are built for"
                                            -- William Shedd

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