In article <76jhsv4pk8ttf7o4su0flpeeja13hg5ols@4ax.com>,
 Erhard Ducke <duc### [at] gentlemansclubde> wrote:

> >shadow_pigment feature from Mlpov
> 
> As a possible and more trivial solution I declared a texture map with a
> radial pattern with frequency 1 to the planet sphere like this:
> 
>                   texture {
>                     radial  frequency 1

Radial? That seems like the wrong tool for the job when you're just 
using different textures on each side of the sphere. The gradient 
pattern would make more sense...or even an object pattern with a plane 
object, though that would make it difficult to blend between the two.


> 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...

This is because you are rotating the entire texture, not just the 
pattern. You need to counter-rotate the textures in the texture_map by 
-y*TIME, or use pigment_pattern or a function pattern to rotate just the 
pattern. If you use the gradient pattern, you could just rotate the 
gradient vector with vrotate().

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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