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Export bsplinesurface as nurbs-import into Rhino

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  • Subject: [mg117292] Export bsplinesurface as nurbs-import into Rhino
  • From: "W. Craig Carter" <ccarter at>
  • Date: Mon, 14 Mar 2011 05:59:26 -0500 (EST)

I am wondering if anyone has done this.  I have a colleague who would 
like to modify a mathematica-generated surface in rhino (CAD software 
which imports a large variety of 3d data files).

I've tried this:
ppts = Table[{Cos[t] Sin[p], Sin[t] Sin[p], Cos[p]}, {p, Pi/6, Pi, 
Pi/12}, {t,
     0, Pi, Pi/6}];

bspl = Graphics3D[{Green, BSplineSurface[ppts]}, Boxed -> False]

Export["test.wrl", b]
for 3ds, dxf, lwo, ply, pov, rib, and wrl.  All of them appear to as 
meshed surfaces and not nurbs. ply cannot be imported.

There is a 2008 mathgroup reference:  
which claims to have done this for iges, , but the source is no longer 
available as far as I can tell.

Thanks, Craig

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