pk <thi### [at] videotronca> wrote:
: (POV is using backward raytracing, right?)

  Wrong.

  (Well, MegaPov has this photon mapping feature, which is bacwards
raytracing, but it's an exception; everything else uses forward raytracing.)

: But, how come you have to shoot rays from the lightsource to know the
: shadows?

  I didn't say that.
  You don't shoot rays from the light source towards the objects, but in
the other way around: You shoot rays from the objects to the light source
and see if there's anything in the way.

: BTW, what does "L: a*x + b*y + c*z + offset = 0" mean?? i don't
: understand the offset thing 8(

a*x + b*y + c*z = 0  would be a line that passes through the origin.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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