Dimensioning Polygon-format CAD

"there are many disadvantages to representing an object using polygons"

The unfortunate reality is that you sometimes have no option but to use a polygonal representation even if a NURBS model is more appropriate. Measurements made off such models are inherently limited in precision, but can be useful provided you keep this limitation in mind. This article – and this 60 second video – explain how you can not just measure but dimension polygonal formats such as OBJ and STL.

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