Presets for given Analytical Projection Z. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0) 
Syntax
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| Visual C++ | 
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Members
| Member name | Description | 
|---|---|
| TopOrInterior | Top for floor or Interior Face for wall element. | 
| CenterOfElement | Center of element. | 
| BottomOrExterior | Bottom for floor or Exterior Face for wall element. | 
| CenterOfCore | Center of core. Applicable for wall analytical model only. | 
| Plane | Use a Plane for projection (e.g., Grid, Level). |