Jon Berndt wrote:
> 
> Here is a picture that uses the nighttime earth image featured a couple of
> days ago on the Astronomy Picture of the Day web page. The image can be
> downloaded now at:
> 
> http://antwrp.gsfc.nasa.gov/apod/image/0011/earthlights_dmsp_big.jpg 

	Thank you good sir, a thousand thank yous. May Allah bless you. That is
exactly the image I have been looking for, for a year now. 

	And since you post the code. I plan a daylight sphere and a night
sphere trivially displaced so that half is dark and half is light. And
that being animation material. 

> Below is the simple code I used to generate it. Pretty basic, but it makes a
> nice picture, and a good background screen.
> 
> // Persistence of Vision Ray Tracer Scene Description File
> #version 3.1
> 
> #include "colors.inc"
> 
> global_settings {
>   assumed_gamma 1.0
> }
> 
> camera {
>   location  <0.0, 3.5, -3.0>
>   direction 1.5*z
>   right     4/3*x
>   look_at   <0.0, 1.0,  0.0>
> }
> 
> background { color Black }
> 
> light_source {
>   0*x
>   color White
>   translate <-8, 3, 30>
> }
> 
> sphere {
>   <0, 0, 0>
>   0.5
>   texture {
>     finish {
>       ambient 0.7
>       diffuse 0.9
>     }
>     pigment {
>       image_map {
>         png "earthlights_dmsp_big.png"
>         map_type 1
>         interpolate 2
>       }
>     }
>   }
>   rotate <0,-140,0>
>   scale 2
>   translate <0,1,0>
> }
> 
>  [Image]

-- 
Kicking the crap out of Canadian Nationals is half the fun
in life. Who would imagine an ice hockey team in Tampa. I 
do love the Hansen Brothers even though they are Canadians. 
	-- The Iron Webmaster, 174

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