Sven Littkowski wrote:
> Not bad - it looks even somehow atmospherical.
> 
> Sven

Thanks!

Sam

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Hi
I already have some difficulties with the lights in my scenes. The light and
the atmosphere of your image are very interesting to me. Could you show or
explain me the way to do it.
Is there a tutorial about lights for some realistic light? My scenes usually
appear too much artificial
 I learned much by observing other codes

thanks
thierry

http://pagesperso-orange.fr/mops/atelier05.html

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mops nous illumina en ce 2008-05-21 10:51 -->
> Hi
> I already have some difficulties with the lights in my scenes. The light 
> and
> the atmosphere of your image are very interesting to me. Could you show or
> explain me the way to do it.
> Is there a tutorial about lights for some realistic light? My scenes 
> usually
> appear too much artificial
> I learned much by observing other codes
> 
> thanks
> thierry
> 
> http://pagesperso-orange.fr/mops/atelier05.html
> 
Things that will make your light look more natural:
1 - area_light. In the real world, point light only comes from stars. Use 
adaptive to accelerate them. With adaptive, use a relatively large density: 
something like 17x17 or 33x33. Still fast and almost no banding nor graininess.
2 - light fading. Use fade_distance <Some Value> and fade_power 2. fade_distance 
should be commensurable with the appearent dimention of your source. You may 
need to use some high intensity values, like rgb 100 or even more in some cases.
3 - Add some slight colouration, keep it subtle. Ex.: rgb<1.101, 1.007, 1> for a 
slightly orangish light.

If you want to make a spherical area_light, use circular orient.

-- 
Alain
-------------------------------------------------
Grabel's Law: 2 is not equal to 3 -- not even for large values of 2.

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mops wrote:
> Hi
> I already have some difficulties with the lights in my scenes. The light 
> and
> the atmosphere of your image are very interesting to me. Could you show or
> explain me the way to do it.
> Is there a tutorial about lights for some realistic light? My scenes 
> usually
> appear too much artificial
> I learned much by observing other codes
> 
> thanks
> thierry

Hello Thierry,

I almost always use area_lights. Lately I have been using POV version 
3.7.0.beta.25 for the area_illuminate feature. The area_illuminate flag 
causes an area_light to light up objects as if from an emitting square 
patch of light. Very cool.

Here's an example light from one of my scenes:
light_source{
  <0,1,0>*100000,
  <1,.8,.5>*2
  area_light x*250000,z*250000,8,8
  jitter
  adaptive 2
  area_illumination on
}

I also use my Luminous Bloom .pov file for adding a post-process glare 
effect to the entire image. I will probably release a new version soon, 
and will report to this group when I do.

The last version can be found here:
news://news.povray.org:119/4606bd36@news.povray.org

> http://pagesperso-orange.fr/mops/atelier05.html

I downloaded your tangence.inc file. Great stuff! I can see it becoming 
very useful. Your belt macros look very good, too.

Sam

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