Here are 2 reverse engineering questions from a beginner:  

1.  I have some .stl triangle polygon mesh scans that I’ve imported into Rhino 5.  Which plug in is best to change it into NURBS? The mesh file sizes are around 50 MB and  I’ve read that the MeshToNurb command is not the way to go as it can increase the file size by quite a bit. 

2.  Or can I work directly with the mesh?  

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Hi Beverly - you can work directly on a mesh to a certain extent, but what do you need to do? MeshToNURBs will just make a face for each triangle, which is not at all the same as reverse engineering and probably not useful in your case even apart from file size issues. 

There are several reverse enginnerring 'helpers' here: http://www.rhino3d.com/resources/

-Pascal

pascal@mcneel.com

I emailed you the file for reference as it is over the 5MB limit, thanks.

Reverse Engineering is a pretty advanced, annoying, un-fun job, so the first question would be, do you really need to turn it into NURBS? You can integrate surfaces models (eventually) with meshes to output to STL or machining. When I have done the mesh-to-NURBS thing, it's mostly been simply a process of re-builidng the object using the mesh as a guide, maybe(maybe!)taking cross-sections through it and lofting them if the finer details aren't real critical and the shape happens to work for it.

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