Hi Brian,

> Another thought: script to copy an object, based upon two points, to another location with two points... OK in 2D ?
> Maybe ArrayGem does this.

Check out Transform > Orient > Line to line - it does that kind of transformation, which is just basically a move from one line's start point to the other line's start point, and then a rotation by the angle between them (and optionally a scale by the difference in length between them too).

It works like this:




ArrayGem is a slightly different, it builds a "base frame" around the starting circle, and then figures out a target frame that is oriented around the surface normal and then does a frame-to-frame transformation which is also really just a move + rotation as well though.

- Michael