POV-Ray : Newsgroups : povray.newusers : Media and Lightsources Server Time
6 Nov 2024 13:26:50 EST (-0500)
  Media and Lightsources (Message 1 to 5 of 5)  
From: Karsten Senz
Subject: Media and Lightsources
Date: 2 Dec 1998 08:26:34
Message: <36653F17.E2253774@wi-bw.tfh-wildau.de>
Hej ,

i have a (maybe stupid) question that came up while playing with media.
I'm using a global media to let the light become visible. Now my
question is : 
Does a PointLightSource influence a media or do I have to use a
Spotlight instead ?


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From: Nieminen Mika
Subject: Re: Media and Lightsources
Date: 2 Dec 1998 08:59:41
Message: <366547cd.0@news.povray.org>
Karsten Senz <kse### [at] wi-bwtfh-wildaude> wrote:
: Does a PointLightSource influence a media or do I have to use a
: Spotlight instead ?

  The only difference between a point light and a spotlight is that the
spotlight only illuminates a certain area.
  A point light may illuminate too uniformly for your purposes.

-- 
main(i){char*_="BdsyFBThhHFBThhHFRz]NFTITQF|DJIFHQhhF";while(i=
*_++)for(;i>1;printf("%s",i-70?i&1?"[]":" ":(i=0,"\n")),i/=2);} /*- Warp. -*/


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From: Julius Klatte
Subject: Re: Media and Lightsources
Date: 2 Dec 1998 19:12:27
Message: <3665d76b.0@news.povray.org>
>Does a PointLightSource influence a media or do I have to
use a
>Spotlight instead ?

It lights up the media in the same way, but the effect is
less interesting because a point light source spreads the
light in such a uniform way.

Julius Klatte
http://surf.to/jkhome


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From: Margus Ramst
Subject: Re: Media and Lightsources
Date: 3 Dec 1998 04:02:16
Message: <3666539B.B25A76E4@peak.edu.ee>
Actually, I disagree that the effect is less interesting - it just has
different uses. With media_attenuation and/or light_attenuation you can
make streetlights, lanterns, sun etc. etc.

Margus

Julius Klatte wrote:
> 
> It lights up the media in the same way, but the effect is
> less interesting because a point light source spreads the
> light in such a uniform way.
> 
> Julius Klatte
> http://surf.to/jkhome


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From: Karsten Senz
Subject: Re: Media and Lightsources
Date: 3 Dec 1998 13:18:08
Message: <3666D4E6.931E90A4@wi-bw.tfh-wildau.de>
Margus Ramst wrote:
> 
> Actually, I disagree that the effect is less interesting - it just has
> different uses. With media_attenuation and/or light_attenuation you can
> make streetlights, lanterns, sun etc. etc.

I agree with Margus, I had some nice versions of a PointLight sitting in
a partly transparent texture. So you got beams heading in all directions
and with some fading they will not run out of the screen. Another effect
was a projector that has thrown an filtered Imagemap on a white wall. I
know that is possible without atmosphere too, but you can't see the
beams. It would be nice to here from anybody else who tried it, since I
still don't got it working right. I could post an image in
binaries.images if someone is interested.


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