How to make a one way door?

fubarFX said:

first problem: you have "ignore groups" active, ignore groups also ignores the entity part of brush entities. don't use ignore groups when you copy stuff

second problem: yeah welcome to source. I'm not sure what the definitive answer for that is but you can always make the door blockable by players so they don't get squashed or stuck

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theatreTECHIE said:

You can make it by having two triggers, one which sends the output onstarttouchall open, and the other sending onendtouchall close. The open trigger you make what size you want, but don't allow it to extend into the door.

The close trigger you make sure completely matches the open door trigger, but you also extend it through the door to just past the door so people won't get stuck in the door.

Illustration:

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