I may be wrong, but isn't it the famous shadow line problem? IIRC Alan
Holding found a workaround: use two copies of the same mesh: one with the
no_shadow flag and the other one with no_image and no_reflection.

--
Jonathan.

"Gilles Tran" <tra### [at] inapginrafr> ha scritto nel messaggio
news:3bf6794e$1@news.povray.org...
> The outline of smooth meshes exhibit black dots or areas. Apart setting a
> high ambient value, I haven't found a way to make them disappear.
> This is of course related to the fact that smoothness is simulated.
Another
> related artefact is that facets can be visible too. However, while the
facet
> problem mostly goes away when the resolution of the mesh is increased, the
> black outline problem can be quite visible even with hi-res meshes. It can
> become very annoying when the mesh has a light texture (such as skin) and
is
> set on a light background. I had to touch up images a few times due to
this
> : artefacts that were lost in the antialisasing at 800x600 became
> conspicuous at higher image sizes. The editing is not very easy either, as
> the dots are pure black.
>
> See the examples in beta-test.binaries. One is with a low-res mesh sphere,
> the other with a high-res mesh sphere.
>
> This is an old problem, so bringing it up at this stage here may seem
quite
> late or even unappropriate. Anyway, as it's likely that 3.5 users will use
> meshes more often, I wonder whether there could be fix (or at least
> workaround) for it.
>
> G.
>
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