An enumerated type listing boundary options of spatial element geometry calculation. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Members
| Member name | Description | 
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| Finish | Spatial element finish face. | 
| Center | Spatial element centerline. | 
| CoreBoundary | Spatial element core boundary. | 
| CoreCenter | Spatial element core center. |