This advanced video tutorial shows you how make a switch/lever/button that triggers another instance to do something in GameMaker Studio.
The idea is quite simple. You have an tigger plate, a switch or something that triggers another instance like a door, traps or mechanism. This video tutorial shows you have to make such a thing the easiest way possible to have a walk over button that opens a trap door.
It is crucial to understand how to access other instances with the “with” statement and then if needed to compare specifically marked instances to the specificly marked (with a variable, here “activate”) buttons in order to do something (open door, activate trap, trigger something).
Door in thumb CC0 by russpuppy:
https://opengameart.org/content/rpg-tileset
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0:00 Explaining what we will do
1:10 Subscribe
1:46 Concept explained
2:20 Coding part, activate by collision with the player all trap doors
4:35 Setting up with statement to access only specific trap doors
8:10 Optional: how the trap door movement works
10:23 Game shown: Smelter
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