"Kenneth" <kdw### [at] earthlinknet> wrote:

Oops, I made a dumb mistake there. The macro textures should be like this...

#macro dome(position, rayon, insideTexture, outsideTexture)
     difference{
       difference{
           sphere{position, rayon*1.11 texture{outsideTexture}}
           sphere{position, rayon
                texture{pigment{rgb .5}} // any color at all, for the 'outside'
                                         // of this dome shape
                interior_texture{insideTexture}
                 }
         box{position-<rayon*1.11,0,rayon*1.11>,
 position+<rayon*1.11,rayon*1.11,rayon*1.11>}
     }
 #end

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