Maybe i am just missing something.
(Eevee, Blender 2.9) I have a cylinder and I wish to add 2 meshes to and cut a shape from the side.
I select cylinder object and then use Ctrl+R in edit mode to create an upper segment. I highlight all faces of the upper segment and apply one material - pink. I highlight all the remaining lower faces and apply second material - grey.
I add smooth shading, edge split and subsurface division (catmuli) - then the mesh material (pink) jumps and extends beyond the mesh bounds.
If i click "on cage" option in subsurf then the mesh material extends to the full size of material - but not to the original height of the mesh cut.
Then i add a rectangle mesh and perform a "knife project" on them to cut shape out of side of cylinder. Doing this displaces the entire material.
In the attached blend file there are 3 cylinders
Cylinder 1 - the original size of material applied to top segment, no modifiers
Cylinder 2 - the new size of pink material, after applying modifiers.
Cylinder 3 - the deformed material from the knife project
Why does this material displacement happen? Why the deform on knife project?
Thanks in advance. U.