In your case there is no intersection points, however, the intersection segment exists. Please, try
int nb = ICC.NbSegments();
Archived discussion
Failed to calculate self interference
Geom2dAPI_InterCurveCurve
Failed to calculate self interference
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Standard_Real df, dl;
Handle(Geom_Curve) C = BRep_Tool::Curve(aE, df, dl);
gp_Pln pln(gp::Origin(), gp_Dir(0, 0, 1));
Handle(Geom2d_Curve) C2D = GeomAPI::To2d(C, pln);
Geom2dAPI_InterCurveCurve ICC(C2D);
int nb = ICC.NbPoints();
Discussion
4 archived replies
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The algorithm detects only tangential (segment) intersection in this case. Check NbSegments() method.
Thank you for your reply。
I test another curve like the Attachments ,The algorithm lost an intersection point.
I confirm the problem exists. One intersection point is not found. Could you report it to OCCT bugtracker: https://tracker.dev.opencascade.org/