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.DB
Assembly:
RevitAPI
(in RevitAPI.dll) Version: 17.0.0.0 (17.0.484.0)
Since:
2016