> FWIW, I've worked on scenes that took 10-15 seconds just to "parse" (due
> to loops that procedurally generated lots and lots of objects).

that's nothing, I, and I believe I'm not the only one, have worked on scenes 
that took a couple of minutes to parse.
Very irritating sometimes, because a mosaic-preview of the scene often only 
takes a couple of seconds.  So I'll have to wait ten times the tracing-time 
just to notice the camera is facing the wrong direction :)

My point: unless you change the meaning of "parsing" (which doesn't speed up 
anything, and therefor would be, imho, considered useless), parsing is NOT 
neceseraalery (I hate that word, never get it even close to right, probably 
cause I'm not even trying anymore) 'very quick', on the contrary.

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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