surface simulation in between two splines 

Hi , this gopi , I am trying to simulate surface in between two splines , I understand it is complex , I when  observe the Plane class derived from Object3D , it is easy to extend for this functionality for 3D curved surface. the Plane class  method has to receive  spline points  and generate like nurb surface , it is helpful lot to others.. thank you

Consider this is as request
send me any other suggestions 
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