Hi Pilou - zillions of little tiny facet pieces means zillions of edges and very much more complex fillets (especially at corner junctures where a bunch of edges come together), once again I'd still advise that it's not a great idea for general purpose editing.
Anyway, if you did apply fillets to a polygon model imported that way (without failing due to complex corner junctures) your resulting object will be a kind of strange collection of planar pieces with little separate cylinder fillet fragments between each one, it will be a kind of weird and lumpy/flattened type model and not really the main kind of result that NURBS modeling is oriented towards building.
With NURBS modeling it is intended that a large smooth piece of the model should be made up of one large smooth NURBS surface, not a whole bunch of little flat pieces.
Polygon data and NURBS data are pretty different and it's just not easy to get a proper conversion from diced up polygons into smooth surfaces.
.... You can also hammer a square peg into a round hole if you slam it hard enough. However, just because you can do something with a bunch of gyrations does not mean it's also a good idea though.
It may be an ok technique for certain specialized circumstances - if for example your actual model is supposed to be made up of flat pieces like a box or diamond shape then it's ok. But for any kind of curved surfaces it's not very good.
- Michael
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