Hi,
you should use something like that:

//start code

#declare lightsource = <0,1,1>*1000;

sphere {
        0,1
        texture {
                slope {lightsource,0,1}
                texture_map {
                        [0.475 night_tex]
                        [0.525 day_tex]
                }
        }
        rotate -140*y
        rotate -20*x
}

camera {location <3,3,-3> angle 33 look_at 0}
light_source {lightsource,2.5}

//end code

Norbert



Erhard Ducke wrote:

>Hi!
>Is it possible to show different image_maps on an object depending on the
>quantity of light that falls on a part of the object?
>Background:
>The earth should show a night bitmap (with city lights) on the night side
>and another bitmap on the side that is hit by the sunlight...
>Thanks!
>E.D.
>Erhard Ducke
>

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