I'm getting a weird problem with the lathe object. I'm getting random black 
pixles in a line at a certain point.

Render @ http://cg1.org/lathe.png

Source follows:


camera
{
   location <10,40,-70>
   look_at <0,30,0>
}

light_source
{
   <5,50,-100>,<1,1,.8>
}


sky_sphere
{
   pigment {rgb .5}
}
#declare column = union
{
   
lathe
{
   quadratic_spline
   11
   <4.1,-4>,<4.1,-3>,<4.1,0>,<4,1>,<3.5,1.05>,<3.4,2.5>,<3.2, 
3.2>,<3.2,4.7>,<3.0,5>,<2.8,40>,<2.8,41>
   texture
     {
        pigment
          {
             rgb 1
          }
     }
   sturm

   
}
   torus
     {
        3,.4
        translate y*45
     }
   torus
     {
        3.5,.5
        translate y*55
     }
   
   torus
     {
        3.25,.7
        translate y*50
     }
   
   cone
     {
        <0,45,0>,2.9,<0,55,0>,3.5
     }
   
   
   
   texture
     {
        pigment
          {
             rgb 1
          }
     }
   
}

#declare minx = -40;
#declare maxx = 40;
#declare minz = -40;
#declare maxz = 40;
#declare thespacing = 40;

#declare thex = minx;
#declare thez = minz;

#while (thex <= maxx)
#declare thez = minz;
#while (thez <= maxz)

object
{
   column
   translate <thex,0,thez>
}


#declare thez = thez + thespacing;
#end
#declare thex = thex + thespacing;
#end

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