My first wrangle with Hammer. I have no idea why the trigger box is F-SOLID.

Angel from Run 3

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Tiftid

the Embodiment of Scarlet Devil
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Sep 10, 2016
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You need to select the trigger in Hammer, then hit Ctrl-T to turn it into a brush entity.
Once you've turned it into a brush entity (by default it should be func_detail), you can click on the box with "func_detail" or whatever in it to change what type of entity it is.
In this case, you probably want to make it into a trigger_capture_area.

If selecting it and hitting Ctrl-T isn't working, you may need to hit Ctrl-W first.