The built-in measure tools are fine for getting perpendicular distances to
planes and between points, but what about curved edges and surfaces? I was
frustrated by the lack of this ability, so this is my solution. It's a
general-purpose measurement tool to get the closest distance between points,
edges, and surfaces.
Feel free to use it for whatever you like; if you have any suggestions or
bugs let me know.
The file is in the autodesk.autocad.customer-files newsgroup.
Developed in Iv5.3, will hopefully work in Iv6.
The code is password protected, but if you want to take a look let me know.