This is actually incorrect, but i don’t blame you for being wrong, as the answer is not immediately obvious.
I will try to write up a detailed method on this, as it is a thing unto its own. Samson F. was the one who helped me, so Ill try my best to pass the knowledge along when I can get time to give you a proper guide on this.
Maybe if we had a little more info from what he is trying to have as the trigger? Is it a structure you are placing in the world?