:) not so fast - never is a very long time! :)
On Apr 19, 2012 2:00 PM, "Chris Radek" <ch...@timeguy.com> wrote:

> On Thu, Apr 19, 2012 at 09:45:42PM +0300, Viesturs L??cis wrote:
> >
> > Uhhh, You are right, halfcircles. All three points are on a straight
> > line, around which the arc can freely rotate. I guess that this is
> > special case (is there any other?),
>
> That is just the worst problem.  Your system doesn't uniquely identify
> any arc.  For every start, center, end points there are a pair of arcs
> that share the points.  This is why we have G2/G3.  If you don't have
> a normal vector you can't say which way is clockwise, so G2/G3 don't
> make sense.
>
> This is also a problem you get when you specify the arbitrary plane
> with three points, as was proposed by Ian M.
>
> The correct solution is probably to specify the plane's normal vector.
>
> While it's entirely possible to do, I doubt anyone would ever use this
> feature if someone did the work to implement it.
>
> Chris
>
>
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