I wonder if someone could help me understand why this happens, and how to avoid or fix it?
I am starting with this object:
And I want to crop the bottom off and turn it into this:
I drew a rectangle in space, and intersected the model… Then intersected faces:
Then finally deleted surplus part. But when I click on the rectangle, it highlights the entire bottom face:
I notice it has a thick black line around it, which if I am honest, I don’t really understand what this means… I tried the trick of drawing lines through it, and this helped in some areas, but not others:
I am not sure how to work around this, or how to fix it when it happens…
Could someone take a couple of minutes to explain?