James Patterson wrote:
> 
> >   The HF_Sphere() macro in shapes.inc has been designed for this purpose.
> > See the documentation about standard include files and shapes.inc.
> 
> I found that, but am not sure how to use it with my grayscale topographic
> map of the earths surface.  The documentation says that the macro does not
> use a height field image directly for input and does not tell me how to use
> one indirectly.  I can create a planar height field using pov's height field
> object and my topographic map just fine.  What am I missing?

That macros take a function for defining the elevation.  Something like:

#declare fn_Earth=function {
  pigment {
    image_map {
      png "elevation.png"         
      interpolate 2      
    }                                               
  }   
} 

should work.

Christoph

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