Using NURBS Toolbox; problem in extracting and plotting NURBS Surface

Hi, all

I am using NURBS Toolbox and IGES reader for MATLAB. The IGES reader is supposed to read IGES files from CAD softwares and extract geometric info from it. When i try to extract entities 126 and 128 (which correspond to NURBS Curves and surface). I am getting inconsistent results.

for example.

when extracting NURBS from a Cylinder IGS file from solidworks, I am getting no surface at all. When i use Rhino 3D i get a nurbs surface which looks like a cylinder but it's not Circular in shape like the IGES file.

I need to extract a proper NURBS surface that looks exactly like the IGS file