Erhard Ducke wrote:
> [...]
> 
> T_EARTH_DAY and T_EARTH_NIGHT contain different bitmaps for day and night.
> But now I have a new problem:
> When I rotate the radial around the y- and z-axis according to the position
> of the sun like this:
> texture {
>                     radial  rotate y*TIME rotate z*ECLIPTIC_ANGLE
>                     texture_map {...}
> }
> 
> the bitmap travels with the radial pattern so that not only bright and dark
> zone are moving but the whole earth seems to rotate...
> I tried different positions of rotate, all give the same effect.
> So it seems that the left edge of the bitmap isn't related to the sphere
> any more as usual but to the radial pattern...

This is perfectly correct, you can either apply the inverse transform to 
the textures or apply the transform only to the pattern and not to the 
whole texture.  The latter can be obtained with pigment_pattern:

texture {
   pigment_pattern {
     radial
     color_map { [0 rgb 0][1 rgb 1] }
     rotate ...
   }
   texture_map { ... }
}

the former with an inverse transform:

transform {
   ...
   inverse
}

Christoph

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