I haven't a clue as to what it is that's significant about this
particular isosurface. All the other parametrics in my Isosurface
Tutorial come out the same as they did in previous betas.

Under previous betas (and when rendered with Ingos "param.inc") it's a
sphere with ripples on the surface. Under beta 8 (both versions) it's a
very thin wavy ring.

POV 3.5b8, Win 98se, Celeron II 850, 128 Mb


#declare R=2;

camera { location  <1*R, 2*R, -4*R> look_at <0, 0, 0> angle 20}

sky_sphere { pigment {
    gradient y
    color_map { [0.0 color blue 0.6] [1.0 color rgb 1] }
  }
}

light_source {<100,200,-100> colour rgb 1}
light_source {<-100,-200,-100> colour rgb 0.5}

#declare Fx = function {sin(u)*sin(v) +cos(20*v)*0.05}
#declare Fy = function {cos(u)*sin(v) +cos(20*u)*0.05}
#declare Fz = function {cos(v)}//        +sin(20*u)*0.05}
                        
#declare U1 = -1*pi;
#declare U2 =  1*pi;
#declare V1 = -1*pi;                       
#declare V2 =  1*pi;

parametric {
  function {Fx(u,v,0)}
  function {Fy(u,v,0)}
  function {Fz(u,v,0)}
      <U1,V1>,<U2,V2>
  contained_by{box{<-R,-R,-R>,<R,R,R>}}
  precompute 18, x,y,z
  pigment {rgb 0.9}
  finish {phong 0.5 phong_size 10}
  no_shadow
}


-- 
Mike Williams
Gentleman of Leisure

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