Intersect (Knife)
Reference
Mode
Edit Mode
Menu
Face ‣ Intersect (Knife)
The Intersect tool lets you cut intersections into geometry. It is a bit like the Boolean tool, but, does not calculate interior/exterior geometry. Faces are split along the intersections, leaving new edges selected.
Source
Selected/Unselected
Operate between the selected and unselected geometry.
Self Intersect
Operate on the overlapping geometry of the mesh.
Separate Mode
All
Splits the geometry at the new edge.
Cut
Keep each side of the intersection separate without splitting the faces in half.
Merge
Merge all the geometry from the intersection.
Merge Threshold
See Intersect (Boolean).