I would imagine that by placing lines and curves you could get the dimensions for most objects. you could work out how wide and long a car is without blueprints.
I cant imagine the texture it generates being very good.

theres a program that can kind of do this already called hexagreat 3d.
here is tutorial that gives the idea.
http://www.youtube.com/watch?v=aErINi7LgOc

The program seems to be a culmination and combination of several techniques,
as shown in some of the research papers, with decisions made by the operator being incorporated.

http://www.faculty.idc.ac.il/arik/site/research.asp

WoW

It's just, a toy, not for professional use.