Compute the driving curves. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 18.0.0.0 (18.2.0.0) 
  Since:  2014 
Syntax
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Return Value
Returns an empty array if an error is encountered.Remarks
 The driving curves are the ones that appear in rebar sketch mode. They include lines and arcs that drive the shape, but exclude fillets and hooks. They always lie in a plane-- if the bar is 3D, these curves are a subset or a projection. They are also used for shape matching. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions InvalidOperationException | This method applies only to shape driven rebar. |