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From: angel3435
Subject: reflected sky color in scene
Date: 4 May 2010 06:10:00
Message: <web.4bdff1a51e1237fb59f2b5a0@news.povray.org>
hi to all, i'm a newbie on povray an i have a little problem:

i write a sky with this code:

sky_sphere{
     pigment{
     image_map{ jpeg "sky.jpg"
                map_type 2    //  cylindrical
                interpolate 2 //  bilinear
                once //
              } //  end of image_map
      scale<1,1.02,1> rotate<0,0.00,0>
    }
} // end of sky_sphere --------------------

but with this code, the color blue of the sky is in all object in my
scene...that is, in the object of the scene there is a blue component.
How i can do, for delete this effect?
thanks in advance!


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From: clipka
Subject: Re: reflected sky color in scene
Date: 4 May 2010 06:28:09
Message: <4bdff6b9$1@news.povray.org>
Am 04.05.2010 12:06, schrieb angel3435:
> hi to all, i'm a newbie on povray an i have a little problem:
>
> i write a sky with this code:
>
> sky_sphere{
>       pigment{
>       image_map{ jpeg "sky.jpg"
>                  map_type 2    //  cylindrical
>                  interpolate 2 //  bilinear
>                  once //
>                } //  end of image_map
>        scale<1,1.02,1>  rotate<0,0.00,0>
>      }
> } // end of sky_sphere --------------------
>
> but with this code, the color blue of the sky is in all object in my
> scene...that is, in the object of the scene there is a blue component.
> How i can do, for delete this effect?

To answer that question, we'd need to know how you /achieved/ that 
effect in the first place. It's not like that's normally automatic with 
the quoted code.

Are you perhaps using radiosity? That would indeed effectively turn the 
sky sphere into a diffuse blue illumination source - which, if you think 
about it, is perfectly realistic. Note though that in reality, the 
primary direct illumination source - the sun - has a somewhat yellowish 
hue, which on average cancels out this effect.


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From: angel3435
Subject: Re: reflected sky color in scene
Date: 4 May 2010 06:55:00
Message: <web.4bdffc32f2ed3609b59f2b5a0@news.povray.org>
>
> To answer that question, we'd need to know how you /achieved/ that
> effect in the first place. It's not like that's normally automatic with
> the quoted code.
>
> Are you perhaps using radiosity? That would indeed effectively turn the
> sky sphere into a diffuse blue illumination source - which, if you think
> about it, is perfectly realistic. Note though that in reality, the
> primary direct illumination source - the sun - has a somewhat yellowish
> hue, which on average cancels out this effect.

Yes, i'm using radiosity. The sun is my only light source and has a white color?
I must change his color to a yellowish one?


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From: clipka
Subject: Re: reflected sky color in scene
Date: 4 May 2010 09:17:00
Message: <4be01e4c$1@news.povray.org>
Am 04.05.2010 12:51, schrieb angel3435:

>> Are you perhaps using radiosity? That would indeed effectively turn the
>> sky sphere into a diffuse blue illumination source - which, if you think
>> about it, is perfectly realistic. Note though that in reality, the
>> primary direct illumination source - the sun - has a somewhat yellowish
>> hue, which on average cancels out this effect.
>
> Yes, i'm using radiosity. The sun is my only light source and has a white color?

Is that a question, or rather a statement with a typo question mark? I 
guess you should know yourself what light sources are in your scene.

> I must change his color to a yellowish one?

Yes - if you want a more neutral overall colouring of your image, you'll 
need to do that.


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From: angel3435
Subject: Re: reflected sky color in scene
Date: 5 May 2010 03:30:00
Message: <web.4be11e3cf2ed3609b59f2b5a0@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 04.05.2010 12:51, schrieb angel3435:
>
> >> Are you perhaps using radiosity? That would indeed effectively turn the
> >> sky sphere into a diffuse blue illumination source - which, if you think
> >> about it, is perfectly realistic. Note though that in reality, the
> >> primary direct illumination source - the sun - has a somewhat yellowish
> >> hue, which on average cancels out this effect.
> >
> > Yes, i'm using radiosity. The sun is my only light source and has a white color?
>
> Is that a question, or rather a statement with a typo question mark? I
> guess you should know yourself what light sources are in your scene.
>
> > I must change his color to a yellowish one?
>
> Yes - if you want a more neutral overall colouring of your image, you'll
> need to do that.

Excuse me, in the first question there is a wrong question mark! sorry!


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