cant use intersect (knife)

I’m reading Learning Blender 2nd edition by Oliver Villar

I’m trying to use the knife intersect tool:

here are the steps as stated in the book:

  1. select the part of the mesh that you want to use as a cutter
  2. press control F and select intersect knife. the meshes are cut but kept in their positions
  3. remove any parts you dont know

does this mean select a face then press control f? because that doesn’t work

Just follow the steps as you have written.


thanks that video solved it for me. Wasn’t sure what it meant by “selecting mesh you want to use as a cutter”