In FPS maps like Quake you only realized how much invisible clip blocks the map makers put in once you play an amateur map that doesn't have them. You hit thing

In FPS maps like Quake you only realized how much invisible clip blocks the map makers put in once you play an amateur map that doesn't have them. You hit things, get stuck and can even get crushed and die. Or you can try and play an early version of some popular multiplayer map that doesn't have them and it's way less playable. A lot of new creators of course will not believe you if you tell you have to do these affordances. I once tested a person's multiplayer map where a door had a central lip that crushed you if you entered off-center. I told them that it should be fixed, but the answer was "you should always go through doors through the center". It's some sort of very enticing idea of purity. "My map will only have real architecture and no affordances." In the end it will self correct.