Thanks.  I'll have to give this a try.

"Bill DeWitt" <bde### [at] cflrrcom> wrote in message
news:3bf14f77$1@news.povray.org...
>     My indenting got eaten by the news reader... here is something more
> readable... I hope...
>
> #declare  SPHERE = function {x^2 + y^2 + z^2 -1}
>
> //... then one for your imagemap
>
> #declare  IMAGEMAP  =
> function {
>                  pigment {
>                          image_pattern {
>                                tga "ImageMapHF16.tga"
>                                map_type 1
>                                interpolate 2
>                               }
>                 scale < 0.0, 0.0, -1.0 >
>                                         }
>                                }
>
> //    ... then you add them together....
>
> #declare SHIP=function{
>                               SPHERE(x,y,z)
>                            - IMAGEMAP(x,y,z).grey *.75 }
>
> //     ... then you make it an isosurface...
>
> isosurface {
>   function { SHIP(x,y,z) }
>         evaluate 1, 1000, 0.99
>         max_gradient 200
>         contained_by{sphere{0,1.5}}
>         pigment { rgb 1 }
>         scale < 1.0, 0.25, 0.75 >
> }
>
> "Bill DeWitt" <bde### [at] cflrrcom> wrote in message
> news:3bf14dfa$1@news.povray.org...
> >
> > "Captain Tylor" <fis### [at] hrupennedu> wrote in message
> > news:3bf138ae$1@news.povray.org...
> > > I didn't know you could use image maps on isosurfaces.  Is there a
> source
> > > code example anywhere of using an image map on an isosurface that I
> could
> > > see?
> >
> > First you make a function for your sphere...
> >
> >
> > #declare  SPHERE = function {x^2 + y^2 + z^2 -1}
> >
> > //... then one for your imagemap
> >
> > #declare  IMAGEMAP  = function {
> >                                 pigment {
> >                                          image_pattern {
> >                                                         tga
> > "ImageMapHF16.tga"
> >                                                         map_type 1  //
> > spherical
> >                                                         interpolate 2
> >                                                        }
> >                                          scale < 1.0, 1.0, -1.0 > //
flips
> > (optional)
> >                                         }
> >                                }
> >
> > //    ... then you add them to gether....
> >
> > #declare SHIP=function{SPHERE(x,y,z) - IMAGEMAP(x,y,z).grey *.75 }
> >
> > //     ... then you make it an isosurface...
> >
> > isosurface {
> >   function { SHIP(x,y,z) }
> >         max_gradient 200
> >         contained_by{sphere{0,1.5}}
> >         pigment { rgb 1 }
> >         scale < 1.0, 0.25, 0.75 >
> > }
> >
> >
> >
>
>

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