POV-Ray : Newsgroups : povray.advanced-users : Lumens in LightSysIV? : Re: Lumens in LightSysIV? Server Time
19 May 2024 14:50:11 EDT (-0400)
  Re: Lumens in LightSysIV?  
From: Mike Horvath
Date: 12 Jun 2019 22:50:48
Message: <5d01ba08$1@news.povray.org>
On 6/12/2019 1:25 PM, Alain wrote:
> For the Sun, don't bother with light fading : Use a light with the 
> parallel option and you are good. Unless your scene scale is 
> interplanetary, the fading over the extent of your scene is totally 
> negligible.
> For the extent of the Sun when using an area_light, make it's diameter 
> about 0.01 of the distance. Not exact, but close enough.
> For more normal lights, the fade_power must be 2. No other value is 
> realistic.
> For fade_distance : Make it small. For an area_light, it should be about 
> the width of the light. For point light, a value of about 0.1 is correct.

Thanks. What about Lumens? Should Lumens always equal 1 for parallel 
lights mimicking the Sun?


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