POV-Ray : Newsgroups : povray.beta-test : area_illuminate and fade_power not working together correctly Server Time
4 Jul 2024 12:55:52 EDT (-0400)
  area_illuminate and fade_power not working together correctly (Message 1 to 2 of 2)  
From: stbenge
Subject: area_illuminate and fade_power not working together correctly
Date: 22 Jun 2009 23:37:48
Message: <4a404e0c@news.povray.org>
Hi,

When using a light_source with fade_power and area_illuminate, the 
latter feature seems to work only partially. Here's a demo scene:

camera{
  location<0,10,-10>
  look_at 0
}

plane{y,0 pigment{rgb 1}}

light_source{
  y*.1,100
  area_light x*10, z*1, 8, 8
  jitter
  area_illumination
  fade_power 2 fade_distance 1
}

As you can see the lumens congregate near the middle of the 
light_source. It is as though the fade_power falloff is still being 
calculated from the very center of the light_source. It is not spread 
out over the whole area_light as one would expect. This makes creating 
something like a realistic fluorescent light very difficult.

Anyway, thanks to all who are updating POV. On the whole it's a great 
improvement over v3.6 :)

Sam


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From: Warp
Subject: Re: area_illuminate and fade_power not working together correctly
Date: 23 Jun 2009 12:05:14
Message: <4a40fd3a@news.povray.org>
stbenge <" <-"@hotmail.com> wrote:
> It is as though the fade_power falloff is still being 
> calculated from the very center of the light_source.

  That's most probably the case.

-- 
                                                          - Warp


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