Thanks to  both of you.

I found that the object was actually a RAW object which is generated by
moray for rotations using a Glyph.  Changing to cubic spline in Moray has
made a big difference.  Now...to figure out why.

Jim

news:3c48edf2@news.povray.org...
> "jim" <jpkara at mindspring.com> wrote in message
> news:3c48687a@news.povray.org...
> > Hi,
> >
> > I've been seeing some strange artifacts in the shadows of some rot-sweep
> > objects that I've been rendering.  I'm new to this so forgive me if the
> > answer is obvious - but I can't seem to figure out what's causing it.
> >
> > All objects are visible.
> >
> >  Any suggestions would be greatly appreciated!
> >
>
> If I'm not mistaken, there is an optional keyword for using a more precise
> algorithm for lathes. It was something like STURM, but I haven't seen the
> manual... maybe I'm wrong.
>
> I hope it helps you,
>
> Fernando.
>

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