Whenever I try to show the side of a cubic lathe object with an
orthographic camera, I get solid black lines across the surface
(especially where the curve is convex), whether or not I use the sturm
keyword.  Anti-aliasing the image turns the black lines into "static".

This is especially noticeable with the DOS and (unofficial) OS/2
versions of POV-Ray, but still occurs to a lesser degree in the Windows
version (which sometimes just aborts the render with the message
"Illegal number of intersections" instead).

Is there any way around this problem?

Simple sample:

   lathe { cubic_spline 5,
     <0.25,-2>, <0.5,-1>, <1.0,0>, <0.5,1>, <0.25,-2>
     sturm
     pigment { colour rgb <1,1,0> }
   }

   camera { location <0,0,-3> look_at <0,0,0> orthographic }
   light_source { <-50,50,-100> colour rgb <1,1,1> }

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