Is there a way to find the tangent Point, between a curve, and a given vector indicated by a line? (or a script.)

For example, the minimum of the curve, indicated by a horizontal vector (line), near the red arrow.

Or for example, the rightmost point of the curve, indicated by the vertical vector (line), near the other red arrow.

(Placing two tan-tan circles between a line and the curve, at the two outer points where the radius gets minimized, narrows down the tangent point.)

Hi Brian, probably the easiest way is to use the BoundingBox command to generate a tight fit frame around the curves, it will then intersect the curves at the points you want I think.

You can also draw in a line or a construction line using Perp/Perp snap to get things like that too, see here for some examples:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3042.14
http://moi3d.com/forum/index.php?webtag=MOI&msg=3042.13

- Michael

Hi Brian.

As usual, Michael beat me to it, but here's a video of how I would probably do it with MoI.

http://screencast.com/t/WIDzUu7Bxp

Cheers.


Martin (2).

EDIT: Just checked one of Michael's links and it seems much easier to do it his way :)

Thank you to everyone.
Excellent advice and tutorial.
Nice lead to "Jing" also.