Angle Between WorldXYPlane and Surface

[johnharding]

Could you use the ChangeBasis transform? You can get the normal (and associated plane) at the centre of the surface.

Orient function in RhinoCommon

It’s the “ChangeBasis” transform: GeometryBase G; // your geometry; you can call Transform from any GeometryBase type. Plane plane0; Plane plane1; Rhino.Geometry.Transform orient = Rhino.Geometry.Transform.ChangeBasis(plane0, plane1); G.Transform(orient); // will reorient your object I believe that the method is mislabeled in Rhinocommon: it says that plane0 should represent the plane that describes your geometry’s current coordinate system, and that plane1 should represent the target coordi…