Aluminum Saw

[Reddog]

Aren't there duplicator machines that actually use some sort of cad instrument to measure a model, then reproduce from those measurements?

Yup.
We had scanners that would make copying it pretty easy. But would cost you about the same $ as a new 4x4 truck to get it done.

And what did the scanners return for data?

A 3D model we would place into one of our design packages to clean up.

[weimedog]

But what was the format? Three D model can be a whole host of types...surface models, solid models, Faceted, B-rep, point cloud.....was the file a Pedes, Iges, Acis, file? When I hear the "clean up the model" thing, a lot of times that means raw point data and the CAD guys have to construct one from that info. Or faceted where the facet intersections define point locations...and the CAD guys have to construct from that. But no true "model" was transferred only the info to construct one.

[Reddog]

It is proprietary info.  We don't even share the how to with a paying customer.
Bottom line you give them a part you want duplicated and they will give you a 3D solid model back in UG, Catia or Pro E formats that you requested.

[weimedog]

.  

http://www.artec3d.com

"A triangular grid algorithm developed specifically for large models will handle very complex models and harness your computer's resources as efficiently as possible. "

That's called a faceted model..great for display and shading. Ok for machining as you traverse the facets..enough facets and you get good enough accuracy...translates well into famous brand of CAD because they...are based on a hybrid faceted modeler to get speed of display and speed to regen models to work the "associativity" concept!

This your deal?