Hi Trevor,

many thanks for your code. I might just do it and try it out. But it seems, 
I found a good solution on my own. Right now I am rendering a 6400x4800 
pixels image of the Earth, with improved features.

I made some really good changes to the nightside lights - they are now much 
more descent (it really needs such a big resolution to see them - just as in 
nature), and they are now only visible at the nightside because of their 
ambient value and because of their colors. Was a tricky thing, but it works 
now.

As soon as the render has completed, I am going to post that image here.

Greetings,

Sven




"Trevor G Quayle" <Tin### [at] hotmailcom> schrieb im Newsbeitrag 
news:447bd2ba$1@news.povray.org...
>
> "Sven Littkowski" <sve### [at] jamaica-focuscom> wrote in message
> news:447b250a@news.povray.org...
>> Planet Earth, latest version. Atmosphere, 3D clouds, 3D continents, 
>> lights. Question: how to limit lights to only the nightside? Sven
>>
>
> Try playing with this and adapt it to your needs.  It basically uses the
> object pattern with a plane oriented to the direction of the sun.  Inside
> the plane (away from the sun) the Earth light image map is used, outside 
> the
> plane (toward the sun) the texture is transparent.
>
> //start
> global_settings {
>  assumed_gamma 1
>  max_trace_level 10 }
>
> camera{
>  up y
>  right x*image_width/image_height
>  angle 60
>  location <30,30,30>
>  look_at  0
> }
>
> #local SunLoc= <-500,0,100>; //Sun location
>
> light_source { SunLoc rgb 1 } //Sun
>
> sphere{0 9.9999 //planet below
>  pigment {rgb <0,0,1>}
>  finish {ambient 0 diffuse 1}
> }
>
> #local Lights=
> texture{
>  pigment {image_map {png "Earth_Lights.png" interpolate 4 map_type 1}}
>  finish {ambient 4 diffuse 0}
> }
>
>
> #local NoLights=
> texture{
>  pigment {rgbt 1}
>  finish {ambient 1 diffuse 0}
> }
>
>
> #local OBJ=plane {SunLoc 0}
>
> sphere{0 10
>  texture {
>    object{
>      OBJ
>      texture{NoLights}
>      texture{Lights}
>    }
>  }
> }
> //end
>
> -tgq
>
>
>

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