Alain <kua### [at] videotron ca> wrote:
>
> Does the surface have zero thickness or do you have coincident surfaces?
>
zero thickness - no
coincident surfaces?
Each end of a curve is on other party of an axis.
But how differently to make a bottom closed?
> You have sevral messages about normalizing zero-length (null) vectors.
> The results are undefined and may explain your artefacts.
>
> Try cutting your object in half, parallel to it's axis, using a textured
> plane or box, like pigment{rgb <0,1,0>}. It may reveal some problem.
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