Micha Riser <mri### [at] gmxnet> wrote in news:3d3b1cf6@news.povray.org

> The reason why I came up with this question was that I am writing my
> own little ray-tracer and have to find a way to handle refraction with
> csgs. 

me too :) But it's now - a 2d (!) program - just for testing some 
algorithms. The important thing - it's a photons-tracer not 
[camera]-ray-tracer. So it will work _much_ slower but will implement all 
radiosity (true - with normals, specular etc), caustics etc in natural way.

Maybe some parts of code may be used in POV ? Normaly ray-tracing is 
ofcourse very fast, but after some point of photo-realistics it may be 
better to use photon-tracer, rather then make wark-around's for ray-tracer 
limitations. 


-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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