I have yet another question! I want to make a door that is locked when the level first starts, then you have to find a key (for instance), and bring it to the door to unlock it. Is this possible in Hammer without any use of programming skills?

Without programming, the idea that comes to mind is that the player comes across the object they need to unlock the door. You use a trigger around or with this object to unlock the door when they find it. If need be, you post a message on the screen that alerts them to the fact that they unlocked the door.

Well what about that part in HL2 EP1 when you have to get out of the parking garage and the gate is missing the handle to open it so you have to find it and bring it to the gate and then it opens?

Are the half life games made on hammer? Is L4D made on Hammer?

create a trigger for opening the door, bring up properties and set it to locked on start. make a trigger to unlock said trigger, make an output so that once the unlock trigger is activated, the door will unlock. You can you a concept like this for many things.

EDIT:sorry, let me explain further after reading ur post againn =P.
You could make a weapon somehow and make it equipped for a really short while. What you can also do, make a trigger around your key, set output to kill the key, and activate the door triggger.

edited on Nov. 13, 2008 05:45 pm by 94sniper