Got it now, thanks

-tgq

"Nathan Kopp" <nat### [at] koppcom> wrote in message
news:3bb2a5a1@news.povray.org...
> You almost had me convinced there was a bug.  :-)
>
> However, it is simply a precision error (possibly related to the object
> pattern, possibly to u/v mapping on the lathe).  To correct the problem in
> this scene, use "40.1" instead of "40.001" in your scene.
>
> -Nathan
>
> "Trevor Quayle" <Tin### [at] hotmailcom> wrote...
> > 3.5 beta4 Win2k
> >
> > I have been toying with uv_mapping, object pattern and transparency to
> > create a bottle label and have come across a very odd phenomenon.  Have
a
> > look at the output of the following code (I will also post the image in
> > p.b-t.b).  The two objects are identical copies but, as can be seen in
the
> > image, operate differently depending on the view.  The lathe is
basically
> a
> > very thin-walled open cylinder with a texture created using the object
> > pattern with transparency.  When seen from the front, the 'V' can be
seen
> > with the rest having transparency, but does not show up in the shadow.
On
> > the other hand, when seen from behind, the 'V' can only be seen in the
> > shadow and not on the cylinder.
>
> [clip]
>
> >  lathe{linear_spline
5,<40.001,0>,<40.001,100>,<40,100>,<40,0>,<40.001,0>}
>
>
>

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