On 15 Oct 1999 11:49:17 -0400, Ron Parker wrote:
>In addition, the two cylinders for A=3 and the two for A=9 will be coincident.

Whoops, that's not right.  The first cylinder for A=3 is coincident with the
second cylinder for A=0.  There are still coincident surfaces in my code, and
a missing cylinder besides.  Try this instead:

camera { location<0,2,-3> look_at 0}
light_source {<0,0,-300> rgb 1}
 
difference {
  sphere   {<0,0,0>, 1 pigment { rgb 1 }}
  sphere   {<0,0,0>,.9 pigment { rgb 1 }}

  #declare A = .001;
  #while (A<6)
 
   #if (A != 3 )
     cylinder { <-1.1,0, 0.0>,<1.1,0,0.0>,.1  rotate y*A*30 pigment {rgb 1}}
   #end
   cylinder { < 0.0,0,-1.1>,<0.0,0,1.1>,.1  rotate x*A*30 pigment {rgb 1}}

 #declare A=A+1;
 #end
}

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