This enumerated type represents the possible bases for derivation of extrusion geometry. 
   Namespace:   Autodesk.Revit.DB.IFC  
  Assembly:   RevitAPIIFC  (in RevitAPIIFC.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Members
| Member name | Description | 
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| InvalidBasis | An invalid basis (typically indicating that the extrusion extraction was unsuccessful). | 
| BasisX | The X direction. | 
| BasisY | The Y direction. | 
| BasisZ | The Z direction. |