On Sun, 9 Sep 2001 15:29:32 +0300, Nikodemus Siivola wrote:
>The reason I am crossposting this to povray.programming is because I
>woudn't mind having a knowledgeable answer to the difficulty of
>implementing such eval and system directives in povray-proper.

There was a patch at one time that implemented a system-like directive.
In fact, I think it was even called "system."  Such a patch has serious 
security implications, so you'll probably never see it in the official
POV-Ray, and it's a violation of POVLEGAL, so you'll never see it in a
legal unofficial version either.

-- 
#local R=rgb 99;#local P=R-R;#local F=pigment{gradient x}box{0,1pigment{gradient
y pigment_map{[.5F pigment_map{[.3R][.3F color_map{[.15red 99][.15P]}rotate z*45
translate x]}]#local H=pigment{gradient y color_map{[.5P][.5R]}scale 1/3}[.5F
pigment_map{[.3R][.3H][.7H][.7R]}]}}}camera{location.5-3*z}//only my opinions

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