Warp <war### [at] tagpovrayorg> wrote:
> Bui Nguyen Minh <bnm### [at] ifieduvn> wrote:
> > hi,
> > i'm new to POV-Ray, i'd like to use POV-Ray to make an image illustrating
> > radiosity. As i now, it seems that POV-Ray uses photon map for radiosity
> > but i need a method "radiosity"- i mean: it calculates form factors,.., is
> > it
> > possible to do that in POV-Ray ?
>
>   No, povray does not use photon mapping for global illumination.
> It uses a stochastic backward raytracing method first developed by
> Greg Ward which is different from the photon mapping method and the
> polygon algorithm generally called "radiosity".
>
>   I guess that what you are looking for is the latter. The problem
> is that that algorithm only works for polygon-based lightmapped
> scenes and POV-Ray scenes are not limited to polygons but can use
> all types of mathematical surfaces, thus that type of radiosity
> cannot be used.
>
>   The stochastic method used by POV-Ray is somewhat similar to
> that "radiosity" algorithm, but it uses raytracing of semi-random
> rays instead of scanline-rendering and can often produce visibly
> different results.
>
> --
> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -


Thank you very much for your help :)
One more question : is it possible to write a "plug-in" for povray to carry
out the latter ? if not, could you please tell me (in your opinion) what
should i do to carry out the latter? (using another render?, writing an
application?(using OpenGL?)...

Thanks again!

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