POV-Ray: Newsgroups: povray.advanced-users: How to deal with the sun in LightSys

POV-Ray : Newsgroups : povray.advanced-users : How to deal with the sun in LightSys		Server Time 31 Oct 2024 23:32:53 EDT (-0400)

From: SharkD
Subject: How to deal with the sun in LightSys
Date: 28 Jun 2010 17:47:43
Message: <4c29187f$1@news.povray.org>

How do you deal with the sun in LightSys? It takes two parameters: color 
temperature and lumens. There's a shortcut for the sun's color 
temperature, but not for the sun's lumens. Further, unless you are 
modeling at astronomical scales, you're going to have to adjust the 
lumens for distance.

According to Answers.com (and assuming they're correct) the sun's power 
in lumens is 3.75x10^28. Let's say I am modeling the sun at 1/100 scale. 
How would I calculate the new value for lumens?


-- 
http://isometricland.com

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From: Jaime Vives Piqueres
Subject: Re: How to deal with the sun in LightSys
Date: 29 Jun 2010 02:43:11
Message: <4c2995ff$1@news.povray.org>

Hi SharkD:

   The lumens value in Lightsys only has sense when you are using more than
one light, as it serves to balance the relative intensity of each one. In
fact, I could have called it "candelas", or just "intensity"... it is just a
way to set the intensities relative to each other. So, if you only have the
sun light, you can use whatever value that lights your scene sufficiently.

   Regards,

-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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