A Free Form Element that contains non-parametric geometry created from an input solid outline. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Remarks
 The element can participate in joins and void cuts with other combinable elements. 
 Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB Element
Autodesk.Revit.DB CombinableElement
Autodesk.Revit.DB GenericForm
Autodesk.Revit.DB FreeFormElement
 
 Autodesk.Revit.DB Element
Autodesk.Revit.DB CombinableElement
Autodesk.Revit.DB GenericForm
Autodesk.Revit.DB FreeFormElement