"Grassblade" <nomail@nomail> wrote in message 
news:web.471f9b31e04cdb41654d6f060@news.povray.org...
>I used the SDL raytracer found in the help file
> (http://www.povray.org/documentation/view/3.6.1/123/) to refine an idea
> more or less suggested by Bruno Cabasson.
> Top picture skips a ray if (square of) distance in colour-space is smaller
> than an user supplied threshold.
> Middle pic is the result of the unadulterated SDL raytracer.
> Bottom pic is the difference of the two.
> The supplied Skip-a-ray pic requires about 65-70% of the time to render.


is this a similar technique as used here: 
http://www.cip.physik.uni-muenchen.de/~wwieser/render/povray/patches/prt-patch/ ?

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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