"Rune" <run### [at] runevision com> wrote in message
news:3e1b6467@news.povray.org...
> Greg M. Johnson wrote:
> > I said once you'd completed the turn--
> > I'd assert you always want zero roll.
>
> And it is very easy to calculate the transformation that gives zero
> roll.
>
I found one that looks great in all situations , except for an abrupt filp
when you cross the z=0 plane while pointing downward. I'm pleased with it
but wonder if there's a more elegant, one-step solution out there that even
avoids this problem. Care to share yours?
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