We are a team on a university that dons a lot of algorithm, using rhino as the visualization tool and some of the build in function.
But we have not be able to detect if the surface intersection algorithm does. Especial if it is using interpolation or approximation(fitting) of the intersection points are preformed or if it is done in the control point.
We suspect that a interpolation is done, do to the large amount of control points created in the intersection curve, but we don’t know.