Tor Olav Kristensen wrote:

> As an example I have included below some macros that
> solve your second problem (In 3D-space though).

Oops, I didn't read this thoroughly:

> Bjorn Jonsson wrote:
>
> > (2) Given two lines through three points (you can think of this as two
> > out of three sides on a triangle), determine the center and radius of a
> > circle which 'touches' one of the lines at a point with a known distance
> > from the point common to the two lines.

The macros I posted finds the centre of a circle with a GIVEN radius,
and that touches BOTH of your lines. The "touch-points" are also
returned together with the normal-vector for the plane that the two
lines lies in. (The centre of the circle lies in this plane.)

Tor Olav

mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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