Indicates the reference face. The Opening will be created at the direction perpendicular to the reference face. 
   Namespace:   Autodesk.Revit.Creation  
  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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| CenterX | The reference face is at the middle of the element in the direction of x-axis and its normal is parallel to x-axis. | 
| CenterY | The reference face is at the middle of the element in the direction of y-axis and its normal is parallel to y-axis. | 
| CenterZ | The reference face is at the middle of the element in the direction of z-axis and its normal is parallel to z-axis. | 
Remarks
 Direction of the opening.