How to convert a stl./step/mesh into a 3dm. file or a nurbs model to be able to edite in Rhino

I would like to know how to convert a stl/step/mesh file into a 3dm. file so that I can edit it in Rhino 4.0. I also wonder why most organic models are in a mesh form. are they easier to join or something. I know in Rhino when you model something all your edges have to line up or you get a bunch of naked edges wich means your model is not water tight and to my understanding unable to print it or prototype. Thank you. sorry for long description.

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try to open this step format in NX, Solid works or any other cad software and patch your surfaces first, then use the same file for Rhino...

 
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