This function is supposed to calculate the bars in set based on data received in curvesData parameter. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2018 
Syntax
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Parameters
- curvesData
 -  Type:  Autodesk.Revit.DB.Structure RebarCurvesData  
Use the members of this class to access the inputs and define the output curves that make up the free form rebar. 
Return Value
Returns true if the curve generation was successful, false otherwise.Remarks
 This function is called in the regeneration context when at least one data in curvesData parameter was changed.