Function trace 

pub fn trace(
    a: &SurfaceGeometry,
    b: &SurfaceGeometry,
    from: Contact,
    options: Marching,
    tol: Tolerances,
) -> OgeomResult<Traced>

Follow the intersection from a starting point, in both directions.

Errors

OgeomError::Construction if the settings are unusable; OgeomError::NotDone if the two surfaces are tangent at the seed, where there is no single direction to follow.