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4 Nov 2024 14:22:04 EST (-0500)
  Light question (Message 1 to 8 of 8)  
From: Mark M  Wilson
Subject: Light question
Date: 1 Mar 2002 08:41:02
Message: <3C7F8636.FF0BA8A9@ncsl.dcr.state.nc.us>
What is the difference between 
light_source {  0*x  color red 1.0 green 1.0 blue 1.0 ...etc.

and 

light_source{  0*x  color red 0.5 green 0.5 blue 0.5 ... or any < 1.0
for all three colors?

Does using lower but equivalent values for the three colors mean lower
intensity of light?

TIA,
Mark M. Wilson


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From: Markus Becker
Subject: Re: Light question
Date: 1 Mar 2002 09:15:32
Message: <3C7F8D31.F88847C5@aicoss.de>
"Mark M. Wilson" wrote:
> 
> Does using lower but equivalent values for the three colors mean lower
> intensity of light?

Yes.

Markus


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From: Micha Riser
Subject: Re: Light question
Date: 1 Mar 2002 19:37:46
Message: <3c801eda@news.povray.org>
Markus Becker wrote:

> "Mark M. Wilson" wrote:
>> 
>> Does using lower but equivalent values for the three colors mean lower
>> intensity of light?
> 
> Yes.
> 

This also means that the values can be higher than 1.0.


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From: Apache
Subject: Re: Light question
Date: 1 Mar 2002 20:07:26
Message: <3c8025ce@news.povray.org>
> This also means that the values can be higher than 1.0.
Absolutely. In many cases it's better to use values higher than 1.0,
especially when the light fades out in the distance like light sources do in
reality.


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From: Mark M  Wilson
Subject: Re: Light question
Date: 4 Mar 2002 10:32:39
Message: <3C83952F.55CB72E7@ncsl.dcr.state.nc.us>
This I did not know!  I guess I need to bone up on lighting in POV!  
Thanks, folks!
--Mark

Apache wrote:
> 
> > This also means that the values can be higher than 1.0.
> Absolutely. In many cases it's better to use values higher than 1.0,
> especially when the light fades out in the distance like light sources do in
> reality.


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From: Mark M  Wilson
Subject: Re: Light question
Date: 4 Mar 2002 10:37:10
Message: <3C83963E.51C87860@ncsl.dcr.state.nc.us>
Well, what I mean is I didn't know you could specify values greater than
1.0.  Of course I knew that natural light DOES fade out in the
distance.... :-)
--Mark

"Mark M. Wilson" wrote:
> 
> This I did not know!  I guess I need to bone up on lighting in POV!
> Thanks, folks!
> --Mark
> 
> Apache wrote:
> >
> > > This also means that the values can be higher than 1.0.
> > Absolutely. In many cases it's better to use values higher than 1.0,
> > especially when the light fades out in the distance like light sources do in
> > reality.


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From: Warp
Subject: Re: Light question
Date: 4 Mar 2002 11:50:25
Message: <3c83a5d1@news.povray.org>
Fading light brightness is not usually specified with the color intensity
but with fade_distance. The larger the fade_distance, the brighter the light.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -


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From: Apache
Subject: Re: Light question
Date: 4 Mar 2002 13:28:50
Message: <3c83bce2$1@news.povray.org>
I have no idea who it was or when it was, but someone posted a nice lighting
macro which enables you to define lightsources by using real life values (40
watts, etc.)

--
Apache
http://geitenkaas.dns2go.com/experiments/
apa### [at] yahoocom


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