Rhino is the best ever in that. but is 895$, for comercial use. www.rhino3d.com
hamapatch is quite good, also, but is freeware totally :
http://www.geocities.com/hamapatch/program/
Yet though is way less powerful than rhino
But it has referece image loading, for trace over, OBj export with level of subdivision, etc...Very good.
I have used to certain extent for accurate curved surface models.
Ayam is quite good and open source, dunno if there's any export available...is quite advanced.
Blender has some nurbs, but has one of the hardest learning curves ever, and not every body is fond of it.
hamapatch is quite good, also, but is freeware totally :
http://www.geocities.com/hamapatch/program/
Yet though is way less powerful than rhino
But it has referece image loading, for trace over, OBj export with level of subdivision, etc...Very good.
I have used to certain extent for accurate curved surface models.
Ayam is quite good and open source, dunno if there's any export available...is quite advanced.
Blender has some nurbs, but has one of the hardest learning curves ever, and not every body is fond of it.