Some time ago, I had this scene where I took a quartic (borrowed from
the "PIRIFORM.POV" sample scene), and intersected it with a cone. I
wanted the blunt end of the teardrop shape to sort of look like it had
been in a pencil sharpener.

When you look closely at the edge where the cone meets the piriform, it
aquired a narrow overhang, almost like the eaves (or drip-edge) of a
cone-shaped roof. When I clipped it with a plane to see what the
cross-section looked like, it was as if the cone was a piece of
infinitely thin sheet metal extending a tiny bit past the border, like
the brim of a dunce-cap.

Fortunately, it was acceptably unnoticeable when I zoomed out to the
normal view, but I could always still see it, once I knew it was there.

Has anybody else seen this happen?

-jr- 

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