POV-Ray : Newsgroups : povray.binaries.images : overlapping media objects in a light_group : Re: overlapping media objects in a light_group Server Time
7 Aug 2024 13:20:27 EDT (-0400)
  Re: overlapping media objects in a light_group  
From: Tek
Date: 23 Feb 2006 05:19:55
Message: <43fd8c4b$1@news.povray.org>
That makes sense, because pov decides which light group the media's in by 
seeing what the last surface was that the ray passed through. This is of 
course wrong, because what you want to happen is for it to compute one media 
with the light and the other without, but presumably pov just hasn't got a 
way to represent that information internally.

You've just reminded me that the media I was struggling with was inside a 
light group, perhaps that was my problem. I'll do a quick test... nope, I 
think mine was something different.

-- 
Tek
http://evilsuperbrain.com

"Kenneth" <kdw### [at] earthlinknet> wrote in message 
news:web.43fd85cbdd458578a416ed930@news.povray.org...
> Hmm...
>
> It just occured to me what the cause of this little puzzle is. Naturally,
> the solution has come to me only *after* posting my question. :-[
>
> The sphere to the right is not part of the light_group, so where it 
> intrudes
> into the left sphere, the light doesn't interact with that part of 
> it...the
> "left side" of the lens shape. Very logical. The part of the left sphere
> that's on the "right side" of the lens shape IS part of the light_group,
> and its media is being lit as it should be.  Again, very logical. The fact
> that my camera is looking straight-on at the spheres is the cause of the
> "artifact"  It's just a viewing-angle problem!
>
> Ken
>
>
>


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