Applying Alpha Channel (In Game)

[Statyk]

Yeah, the door has internal settings in the entity file that allow it to change model when it has certain levels of health. If you want to make something that changes transparency in-game, you'll have to make multiple versions of this entity, then when interacted with, it switches with the more transparent entity (using entity enable/disable codes is fine). HPL2 doesn't support multiple skins to a model, so it has to be done by replacing the whole model.