Edit Nurbs > : When we attach two surfaces, the Isoparms will have to be combined in one to generate the new attached surface. If the Isoparms don't line up they could be moved, possibly altering the curvature of the surface or extra isoparms are integrated. If the number of isoparms doesn't match new ones will be created to support both sets of the surfaces. The surface will move to close the gap between the two surfaces. If the isoparms are connected the curvature of the surfaces may alter due to the way the isoparms connect with each other. They can blend together or keep their curvature and make a hard connect without influencing the other isoparm.
Edit NURBS >blends surfaces together, but they don't move towards each other. The surfaces themselves will retain their shape, their will be a surface created to fill the gap and the surface will try to align its tangency with the existing surfaces.
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