On 23.05.2012 11:22, Tek wrote:

> The gradient isn't wrapped in pigment_pattern{}, so the rotation and scale
> that's applied to the gradient is also applied to the textures in the
> texture_map.
>
> If you just copy the code from my earlier post it should work.
>

Not just copying, but also inserting the transformations you suggested 
in your posting of May 21... oh, and I also found out that the rotation 
around the y axis has to be applied *before* the compensation for the 
axial tilt to make the day/night boundary following the illumination 
correctly!

Here is my current code and some scenes I rendered:

union
{
   sphere // Earth, surface
   {
     0, 1
     texture
     {
       pigment_pattern
       {
         gradient z
         // transform gradient without affecting patterns in the texture_map
         scale 2 translate -z // offset to middle of gradient
	rotate <0, orb_ang, 0>
         rotate <-bodies[3][4], 0, 0> // x rotation is applied before y
       }
       texture_map
       {
         [0.45 T_Earth_Day]
         [0.48 T_Earth_Night]
       }
     }
     scale <bodies[3][1], bodies[3][3], bodies[3][2]>/sc
   }

   sphere // Earth, clouds
   {
     0, 1
     texture
     {
       pigment
       {
	image_map
	{
	  png "solarsys/cloud_combined_8192a_alpha.png"
	  map_type 1
	  interpolate 2
	}
       }
       finish { F_Standard_Planetary_Surface }
     }
     scale <bodies[3][1]+5, bodies[3][3]+4.983270985, bodies[3][2]+5>/sc
   }
   rotate -y*clock
   SetAxis(bodies[3][10], bodies[3][11])
   translate Pos_Earth/sc
}

// end of code

See you in Khyberspace!

Yadgar

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