Hello, I know there is already tutorial for this from Dragonfly (https://www.dfdoom.com/tutorial-easy-way-make-sloped-archways/), but when I was following it, first I ended up with this: Not sloped archway 1, Not sloped archway 2
Then I somehow did it with sky/ceiling, which lead to this abomination: Absolutely not sloped archway 3
So, does anyone have easier guide how to do sloped archways? I'm quite new to mapping and I didn't use Action 181 before at all, so any help with in-depth explanation would be welcome. Thanks!
(I'm using GZDoom Builder (Bugfix))