Mike Williams <nos### [at] econymdemoncouk> wrote:
> In the third example on this page I
> could just as well have used the x values from one spline and the z
> values from a spline of a different type.
>
> http://www.econym.demon.co.uk/isotut/more.htm

Ok I've read this page and I find it very interesting...but if I try to put
this piece of code in a .pov file the result isn't similar to the image in
this site...

my pov file is:

#include "colors.inc"

camera {

location <10, 10, -10>

look_at <0, 0, 0>
}
light_source { <25, 25, -100> color rgb 1 }

#declare S = function {
   spline {
     natural_spline
      -1, < 0.5, 0, 0.0>,
    -0.5, < 0.2, 0, 0.4>,
    0.01, < 0.2, 0, 0.2>,
     0.5, < 0.4, 0, 0.4>,
       1, < 0.0, 0,-0.6>
   }
 }

isosurface {
  function { y - S(x).x - S(z).z }
 contained_by { box { -10, 10 } }
 pigment{Red}
}


Have you got any idea?!?!

Thanks
Leo

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