[Alexander Nilsson]

It works now, finally! Now I just have to configure the particles to behave the way I want them to. Thank you very much for your expertise! ☺

[Alexander Nilsson]

Hi! Thank you for taking your time and answering!
I used your script, but it doesn’t trigger all the time, I’ll provide a picture. I’ve also put out a few more emitters, though only some of them triggers.

As you said, it will take some work to place out all of the emitters. Wouldn’t it be possible to make a mask and then, when the blue bars hit the mask, particular and optical flares will generate/start, and end as soon as there is no more blue bars?

[Alexander Nilsson]

Hi! Thank you for redirecting me! However, I’m really fresh to after effects, and I can’t seem to get it to work with his project files ( even though he’s probably very thorough).

Now I’ve added a video to my main comp. I’ve duplicated that one and added keylight to it, made the green notes/bars transparent, added a solid layer underneath and made my bars blue. I’ve then added a spotlight emitter, which the particular and optical flare is linked to.

What I’m trying to do is, when the blue bars hit the piano roll, particular and flare will generate/start, then as soon as the piano roll doesn’t have any blue bars within its area, it should stop generating/stop the effect.

Is that possible without having to script? Sorry if I’m being too much of a novice here… ☺ I’ll add a picture of my process!