Is it possible to create a trigger or brush that prevents certain classes from entering, but allows others to enter? For example, a Spy-only room, or a room that allows every class except Pyros.
Maybe if you had a server plugin, but AFAIK no. While there is a filter_activator_class entity, it operates on a different level (ex. player versus grenade object) than TF2 classes.
You could try to make spy-only areas by using some built-in sentry guns so that only a cloaked enemy could reliably pass, but...
It would be easy to create a brush 140-150 units high to block all classes apart from
Triple Jumping Scouts
Soldiers
Demomen
from getting past. Even Engineers standing on sentry guns or crouch jumping can't jump that high. ;D
Anything higher than ~170 and a Scout can't get past either.
I know it's not exactly what you were after, but its useful knowledge
Hmm what is the height of the terrain on top of the tunnel in Badwater? I think that is the upper limit for Force Jumping when combined with a Double Jump.
Not if they can't get close enough: Playerclip to the rescue You could also set up two different sentries with overlapping fields of fire, so that no disguise would work. And while cloaked, no sapping is possible.
I'd be more concerned with BONK! scouts, perhaps even acting as decoys.
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