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 -

Post a reply to this message