Fabien Mosen <fab### [at] skynetbe> wrote:
: No, I'm looking for the value BEFORE it's finally affected by the
: projection system.

  You can't get a color caused by a reflection/refraction BEFORE the final
projection system is set. So you are asking for something that is impossible.

: Oh, BTW, interior {ior} depends on normal perturbation (it
: affects the refracted ray).

  You made a wrong statement and then a true statement in parentheses.
  The normal doesn't affect the ior because the ior is constant. Yes, the
normal affects the refracted ray. A reflected/refracted ray is affected
by many things.

: Good question.  Historically, "finish" has been fed with many
: features that didn't fit elsewhere.  "crand" is an example of
: that.  ambient, diffuse and brillance might go into a separate
: statement, (maybe "lighting") which describes how the surface
: reacts to light.

  Since when finish has contained only view-dependant things?

: I can ask POV-Ray to retrieve it and put the rgb value on-screen,
: without even rendering !

  No, you can't.
  Well, you can, but without shading (due to light sources), shadows,
fog, media, radiosity... A kind of +Q0 image.

:> No, you can't see your pigment if there's no camera and light_sources.

  It's perfectly possible to see a pigment without light_sources.
  A scene without a camera doesn't make sense.

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

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