How to get the point of intersection with isoparametric curve and Geom_Surface ?

[Rennngw]

Hello together, I'm rgw.

I want to get the point of intersection with isoparametric curve and Geom_Surface.

I created an isoparametric curve on a surface and use it to intersect with the surface.

Now I want to know the intersections of a certain isoparametric curve (yellow curves) and the surface.

The intersection result i think is two points and one segment. Take one "long" isoparametric curve for example, it intersects the edge twice and the intersection points should be where as shown below.

First I use UIso to get the isoparametric curve. Then I use GeomAPI_IntCS to get the intersection result.

But the result I got only has many points and the result as shown below.

Any hints, suggestions, corrections, help? Thanks very much!

[xiaotaw]

I also have the same problem. And I plan to use Geom2dAPI_InterCurveCurve, but don't known how to convert an iso_curve into 2d。@tpaviot

# get a iso curve
iso_curve = surface.UIso(0.5) 

# convert iso_curve into 2d

iso_curve_2d = ???

# for each edge of the surface

curve_on_surface, first_param, last_param = BRep_Tool.CurveOnSurface(edge, face)
                
intersector = Geom2dAPI_InterCurveCurve(iso_curve_2d, curve_on_surface, 1e-6)