SpatialElementCalculationPoint is used as the search point for family instances placement inside rooms and spaces. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Remarks
 The Spatial Element Calculation Point is graphically showed as a location point marker with a "snake" line from the origin of the family. If the Spatial Element Calculation Point is turned on, this point will be used as a search point for room and space relations for all instances of this family. 
 Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB Element
Autodesk.Revit.DB SpatialElementCalculationLocation
Autodesk.Revit.DB SpatialElementCalculationPoint
 
 Autodesk.Revit.DB Element
Autodesk.Revit.DB SpatialElementCalculationLocation
Autodesk.Revit.DB SpatialElementCalculationPoint