Additive Triggers

Sometimes you want the player to make something happen (eg. explosions, enemy invasions, etc.) but you want him to do more than just step into a cerain room, or push a certain button, to make it happen. Sometimes you want the player to hit multiple buttons, or step into multiple triggers; well that's where this tutorial comes in.

I am going to show you how to, in this case, release your rebel friends by doing a panoply of things, all by using a math_counter.

I made a map for this tutorial, without the part you care about completed. It's the rudimentary part of the example I will be showing you, so download it from here.

Everything in the map is set, except the ending sequence, which is triggered by a logic_relay. All we have to do is activate that, and then the ending sequence will begin.



The Example Map

Now that we have a basic setup, it's time to make something happen.
See the two hills? Put a func_button on each hill.
Name one button1, and the other button2.
Check the "don't move" flag for each of them
Change delay before reset: -1

Now make a math_counter, and name it counter
Maximum Legal Value: 2



Now give it this output:



Now give each of the func_button entities this output:



Now compile the map. What happens is that after you've pressed both buttons, the door opens, and the citizens inside walk out.

What happens is that when you press a button, it adds 1 to the math_counter (it starts out at 0). The math_counter's maximum value is two, so when both buttons are pressed, it fires its output, which opens the door and releases the citizens.

Now compile and run the map.

*If you learned anything from the above, you don't need to continue*

Now here's another example. Within the same map, place a game_text entity, an env_fade entity, and another math_counter entity.

Env_fade:
Name: fade.
Hold Fade(seconds): 10000.

Game_Text:
Name: text.
Message Text: Congratulations.
Hold Time: 10000.

Math_Counter:
Name: counter2.
Maximum Legal Value: 2.

Give your second math_counter these outputs:



Make two trigger_once entities around the scripted sequence entities already in the map.



Check the "only player ally NPCs" flag, and uncheck all the other flags.

Now give both triggers this output:



Normally I would use the output "OnEndSequence" from a scripted_sequence, but I've found it doesn't work the way I want it to(IE: at all), so I used the method I used

Now compile and run the map, and see the effects!

EDIT:
Due to popular demand, I have added an example map of the full-version of the map in this tutorial.

Linkage