ok going from nurbs to polys is pretty easy, you select the surface and go to modify convert and in the nurbs to polygon select control points and then it will convert with same tesselation.
Going from poly to Nurbs is a little harder , first check the number of polygon rows you have ie 4 vertical and 5 horizontal because you will need to match this later, then convert to a sub.d and the hit 0 on the keyboard to make sure the mesh tesselation at 0.now convert the mesh from sub-d to nurbs, note there are no options for this and the nurbs surface might be more than one patch and more dense than you expect .Now you have your nurbs surface you will need to rebiuld the surface/surfaces so select your patch and go to edit nurbs at the top and hit the rebuild surfaces option box ,select Uniform and change the number of spans in the U and V to match your rows you counted on your original surface ie 4 and 5.
Once you have converted you could stitch the surfaces but you don't have to the convert back to polygons ,just rember to combine and merge verts once you convert back.
Hope this helps a little.
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Last edited by jsprogg; 01-10-2007 at 11:12 AM.