I am trying to find a faster way to get the continuous perimeter of a projected 3D model.

Currently I use three different ways to generate the boundary/perimeter of a 3D model.

The first way is to FLATSHOT the 3D model, then manually trim all entities till the perimeter is left, this method is tedious.

The second way is to FLATSHOT the 3D model, then use the following lisp routine from Lee Mac to generate a boundary/perimeter. This method works well on non complex flatshots.

http://www.lee-mac.com/outlineobjects.htmlhttp://www.lee-mac.com/advpolyoutline.htmlThe third way is the quickest. FLATSHOT the 3D model, then draw a bounding box around the geometry. Hatch all open areas. Once the hatch has been created you can then run the command HATCHGENERATEBOUNDARY, still requires some cleaning.

I have posted a simplified example. Most drawings are much more elaborate.

If anyone has any advice on a better method I would greatly appreciate it. I think part of the issue is there are minuscule gaps that get created during a flatshot.