Well, it makes sense that it may happen when the rays have extremely low
slopes (that is, they go over 1 unit in the X direction for every 100000 or
so units in the Z direction), but why does it happen with an orthographic
camera? At only a distance of about 1000 units? Surely POV can handle more
than four decimals.

--
- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]
"N Shomber" <nsh### [at] hotmailcom> wrote in message
news:3bd9f6ff@news.povray.org...
>
> "Mike Williams" wrote
> > Wasn't it Slime who wrote:
> > >Yeah, sturm didn't help.
> > >
> > >Is it just me, or is POV-Ray 3.5 a *lot* more sensitive to floating
point
> > >precision errors? I never had to pay attention in 3.1... I could use
> numbers
> > >like .0000001 or so before things started messing up.
> > >
> > >Incidentally, this problem doesn't occur with other simple primitives.
> >
> > The example scene you posted exhibits exactly the same problem in v3.1.
> >
>
> It also happens in POV 1.1 on the Amiga at closer distances under the
> maximum distance. It's a pretty old problem.  Computers just don't have
> infinite accuracy.
>
> N Shomber
>
>

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