The LoftNurbsOptions class stores parameter values used to control how  
lofted NURBS surfaces are generated.                                    

Example: Create a loft nurbs options object                             

    options = sv.geometry.LoftNurbsOptions()                            

get_values()  
  
  Get options names and values.
  
  Returns (dict): A dict with key/value pairs for each option name/value. 

knot_span_types
   SimVascular loft nurbs knot span types. 
   
   This attribute provides symbols for the names used to control how knots  
   are generated for a NURBS surface.                                       
   
   The knot span types are                                                  
       (1) AVERAGE = 'average'                                              
       (2) DERIVATIVE = 'derivative'                                        
       (3) EQUAL = 'equal'                                                  

parametric_span_types
   SimVascular loft nurbs parametric span types. 
   
   This attribute provides symbols for the names used to control how        
   parametric space is generated for a NURBS surface.                       
   
   The parametric span types are                                            
       (1) CENTRIPETAL = 'centripetal'                                      
       (2) CHORD = 'chord'                                                  
       (3) EQUAL = 'equal'                                                  

u_degree
   Type: int                                                              
   Default: 2                                                             
   
   The degree value controls the surface curvature in the logitudinal     
   direction of the lofted surface. Degree can be thought of as constraining 
   the surface’s freedom to bend: 1=linear, 2=quadratic, 3=cubic, etc.    

u_knot_span_type
   Type: str                                                              
   Default: 'derivative'                                                  
   
   How the knot vector divides the parametric space in a u knot interval. 

u_parametric_span_type
   Type: str                                                              
   Default: 'centripetal'                                                 
   
   How the parametric space is constructed.                               

v_degree
   Type: int                                                              
   Default: 2                                                             
   
   The degree value controls the surface curvature in the circumferential 
   direction of the lofted surface. Degree can be thought of as constraining 
   the surface’s freedom to bend: 1=linear, 2=quadratic, 3=cubic, etc.    

v_knot_span_type
   Type: str                                                              
   Default: 'average'                                                     
   
   How the knot vector divides the parametric space in a v knot interval. 

v_parametric_span_type
   Type: str                                                               
   Default: 'chord'                                                        
   
   How the parametric space is constructed.