I was playing with radiosity, because it's fun :), and suddenly I 
thought of something: radiosity-effects are added to the current color 
of the pixel, radiosity can never make a pixel darker than it would be 
without radiosity.  So if you're not rendering to a HDRI, and if 
clipping is done before anti-aliasing (which, I know, isn't at the 
moment), POV-Ray could actually stop doing it's radiosity-calculations 
once a pixel has become completely white (or has become "close enough" 
to completely white).

Ok, a lot of if's there, but especially for test-renders, those if's 
shouldn't be too much of a problem, should they?

just an idea of course, and quite possibly not worth even taking the 
time to consider implementing, given that it could only help in very few 
cases, but still, maybe worth considering to be considered? :p

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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