If true, the surface's orientation is opposite to the canonical parametric orientation, otherwise it is the same.
The canonical parametric orientation is a counter-clockwise sense of rotation in the uv-parameter plane.
Extrinsically, the oriented normal vector for the canonical parametric orientation points in the direction of
the cross product dS/du x dS/dv, which S(u, v) is the parameterized surface.
Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 20.0.0.0 (20.0.0.377)
Since: 2016