Thank you for your attention. I should explain more. We don’t know in face1 we have any group or not also we don’t know place of group. I just used “grp” to have an example for my problem. One way is check all groups for intersection. Do you know better way?
Yes that is good idea. Then you have to deal with the face parent group, and the entities object where you want the intersection lines to appear, in the .intersect_with method…
Be careful, this only works if the group is “bigger” than the face and/or not overlapping…