The position on which the reference is hit. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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| Visual Basic | 
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Return Value
a null reference ( Nothing in Visual Basic) if the reference doesn't have a global point.Remarks
 When using a plan view, the Z-value of a GlobalPoint is not meaningful.