Gets the curve loop corresponding to the hole in the wall made by the instance. 
   Namespace:   Autodesk.Revit.DB.IFC  
  Assembly:   RevitAPIIFC  (in RevitAPIIFC.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Parameters
- pADoc
 -  Type:  Autodesk.Revit.DB Document  
The document. 
- pVWall
 -  Type:  Autodesk.Revit.DB Wall  
The host wall. 
- pFamInst
 -  Type:  Autodesk.Revit.DB FamilyInstance  
The hosted instance. 
- pCutDir
 -  Type:  Autodesk.Revit.DB XYZ   %  
The direction of the hole relative to the location of the curve loop. 
Return Value
The opening in the wall.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |