POV-Ray : Newsgroups : povray.bugreports : artifacts on lathe object : Re: artifacts on lathe object Server Time
5 Dec 2021 22:29:07 EST (-0500)
  Re: artifacts on lathe object  
From: David Mandelberg
Date: 10 Oct 2017 16:20:00
Message: <web.59dd2b10d40b44f2146834bc0@news.povray.org>
"omniverse" <omn### [at] charternet> wrote:
> "David Mandelberg" <dav### [at] mandelbergorg> wrote:
> > "Bald Eagle" <cre### [at] netscapenet> wrote:
> > > "David Mandelberg" <dav### [at] mandelbergorg> wrote:
> > > > When I render the below scene, there are some spurious black artifacts near
the
> > > > center of the red vuvuzela. Without the translation and rotation, the
artifacts
> > > > go away. I'm using POV-Ray 3.7.0 on Ubuntu 16.04.
> > > >
> > >
> > > I think there may have been some issues with the bezier spline, that have been
> > > addressed post-v-3.7
> > > I didn't have a chance to render this in 3.7.1-beta.8, but I'd guess it might
> > > look better.
> > > I'd say either install the beta and try it, or use a different spline type.
> >
> > There's still an issue in 3.7.1-beta.9. I'll try 3.8.0-alpha.9322209 next, but
> > it'll take me a bit of time to get to that.
>
> Think you'll find it's the same... except be aware v3.8 has changed default
> ambient so if you render with directive #version 3.7; it will look different
> from using 3.8 in its place.

You're right. 3.8.0-alpha.9322209 has the same issue.

>
> At first I thought the lathe object was thinner but its just the missing ambient
> in shadow.
>
> Nothing new about lathe problems, there was something about negative control
> points for bezier_spline which I'm guessing doesn't actually relate to this
> trouble.


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