The X-vector of the planar face.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0)
Syntax
Remarks
Note that the cross product of X-vector and Y-vector may result in the reverse of the FaceNormal vector depending upon how Revit has structured this particular face.