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Affect RESTING particles by moving the floor?

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Steve Chappell
Affect RESTING particles by moving the floor?
on Sep 7, 2019 at 5:28:26 pm

Hi all. I have some cc particle world particles mapped to a 3d camera tracked layer so they appear to be resting on the floor of the shot. My idea was that I could position the floor in lign with the floor in the shot, and have the floor move with some keyframed audio, in the hope that the particles would slightly bounce off the floor or vibrate with the bassline. I was hoping that if the movement of the floor were sharp enough it could even propell them into the air a bit and have them drop and bounce again. However it seems that after the particles have bounced and rested, moving the floor no longer affects them. Does anyone have a good way to achieve this effect?


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Graham Quince
Re: Affect RESTING particles by moving the floor?
on Sep 8, 2019 at 7:27:14 am

I've just tried this and CC Particle World seems too limited. I did think to suggest Trapcode Particular, but while I can get particles to bounce off a vibrating floor, it's too difficult to control and they keep passing through the floor.

My next suggestion (and I've not tried this) would be to create a layer to be your particle and use an expression to link it's Y position to the audio keyframe. Once you've got it bouncing the way you want, you'll need to duplicate it hundreds of times. Someone else might know of a way of simulating a particle system (actually looks like Dan Ebberts already has: https://library.creativecow.net/articles/ebberts_dan/particle_gen.php)

Hope that helps

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Steve Chappell
Re: Affect RESTING particles by moving the floor?
on Sep 9, 2019 at 11:21:55 am

Thanks for your reply! I'll try with trapcode particular too but I'm not super familiar with it. I think it may be the best way if I can find a way to stop them falling through the surface.

I don't think your other suggestion will work for me because i want the physics to still work on the particles so it looks like they are bouncing naturally, rather than all in a uniform pattern.

Thanks for introducing me to the Dan Ebberts tutorial - looks really interesting and I'd love to get stuck into this when I have enough time (unfortunately won't be for this job!)

Many thanks again


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