POV-Ray : Newsgroups : povray.binaries.images : Hotel crime scene : Re: Spotlights with photons (143KB) (Was: Hotel crime scene) Server Time
1 Aug 2024 02:13:40 EDT (-0400)
  Re: Spotlights with photons (143KB) (Was: Hotel crime scene)  
From: Edouard
Date: 25 Apr 2009 19:00:01
Message: <web.49f39564b14248b518d3cad10@news.povray.org>
Jaime Vives Piqueres <jai### [at] ignoranciaorg> wrote:

> > My plan had a "part two" to it (which I also didn't manage to do
> > properly) - I wanted to render the light and fixture, without any other
> > scene elements, to a full spherical camera, and use that as the
> > transparency map for the light in a real scene (possibly with the fixture
> >  modified with no_shadow). If you get what I mean...
> >
> > It's still on my list of things to experiment with, but perhaps as you
> > are having far more success than I ever did, it might be something you
> > would find interesting?
>
>    Well... the experiment worked great and fast, but has a BIG limitation:
> you cannot use area lights with it, because the "fake photons" effect
> disappears (logically) due to the soft shadows... &%#$!!! :(
>
>    Any ideas? ... I cannot think of anything that will overcome this problem.

Ahh, I see the flaw. The "shadow map" from the light and fitting is an
approximation, but from your experiment it sounds like it's not a close enough
one to actual photons...

Hmm, perhaps a no_area_light object modifier added to the SDL? That would
probably be useful in general to be honest.

I can't think of a multiple light solution that would work, and even if there
was one it wouldn't be a general solution to a scene.

Sorry my idea wasn't a winner in the end!

> Jaime

Cheers,
Edouard.


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