I am trying to cut two different meshes A and B with the same polyline P so that I can join A and B afterwards with no holes or anomalies. I am using the knife project tool and this works quite well.
The problem: the knife project seems to have vertex snapping enabled. Whenever P is too close to any vertex of A or B the new inserted vertex snaps to those vertices. However, the vertices of A and B do not lie at the same positions. Thus, it often happens that-using the same polyline for the projection-the A and B do not fit perfectly due to holes in the joint mesh.
Is there any (hidden) parameter or other possibility to disable this snapping behavior in the knife projection? Otherwise, I need to implement the same functionality by myself just because of the snapping... and I do not want to do that :-D
Edit: it seems there is not only a vertex snapping but a general inaccuracy. I tried to illustrate the problem with the following images.