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Particles in jello

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Joshua Jorgensen
Particles in jello
on Aug 8, 2013 at 6:33:32 pm

I have a situation where I need a particle emitter to emit custom particles from left to right but when the particles reach a certain point on the screen, they need to slow down as though they are passing through a jello block. After they leave the jello they need to speed back up to their normal speed.

Is it possible to use expressions on a per particle basis rather than on the emitter, allowing me to change particle velocity as individual particles reach a range of positions? Or can anyone think of another way to accomplish this same effect?

I have access to Particular as well as the native AE tools.


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Erik Waluska
Re: Particles in jello
on Aug 9, 2013 at 2:12:53 am

I don't know of a way to control the speed of the particles individually, but one thing you might try is to pre-compose the particle animation and then use time remapping on the pre-comp to control the speed of the particles.

Erik Waluska
EAWmedia


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Joshua Jorgensen
Re: Particles in jello
on Aug 9, 2013 at 2:36:32 am

This would work except not all of the particles will be entering and leaving the jello at the same time. If I use time remapping, won't all of them slow down or speed up regardless of where the are in relation to the jello?


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Erik Waluska
Re: Particles in jello
on Aug 9, 2013 at 2:47:32 am

Yes, good point. Could you use a separate layer of particles that are moving slowly just for the Jell-O part of the scene? Maybe use a mask to isolate the portion of the screen where the Jell-O is? It wouldn't match up perfectly of course, and it may also look weird that you've got particles moving very quickly going into the Jell-O and then suddenly moving slow through the Jell-O. I think they would probably need to slow down as they are entering the Jell-O for it to look realistic, but I'm not quite sure how to do that.

Erik Waluska
EAWmedia


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Roland R. Kahlenberg
Re: Particles in jello
on Aug 9, 2013 at 3:09:06 pm

This ZIP package includes an AEP (2 versions in AE CS6 and AE CC). The AEP uses Particle Playground to create particles that are shot off a canon (emitter). The particles then travel at variable speeds. The speed is controlled in a precomp using a grayscale image.

White areas denote fast/normal speeds. Darker areas denote slower speeds. As a particle travels across different luminance areas, its speed varies accordingly.

Here's the AEP - 6386_particleplaygroundvarispeedparticles.zip

HTH
RoRK

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI


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Joshua Jorgensen
Re: Particles in jello
on Aug 9, 2013 at 5:15:17 pm

Hi Roland,

This is great and at first glance is exactly what I need. I'll dive into it to learn how it works and see if it can be adapted to my needs.

Thank you very much for putting this together.

-Joshua


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Roland R. Kahlenberg
Re: Particles in jello
on Aug 9, 2013 at 7:45:47 pm

Since you liked what you saw, I came up with another version - not to make you unlike the original version BUT more so that you may have a preference for this newer version ;-)

6389_particleplaygroundvarispeedparticles02.zip

If you have any Qs, please be specific on the area(s) where you need more info.

Cheers
RoRK

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI


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Joshua Jorgensen
Re: Particles in jello
on Aug 9, 2013 at 8:26:44 pm

I'm going to spend some time this weekend dissecting this new version but will be sure to post any questions I run into. Thanks for this. It's great.


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Erik Waluska
Re: Particles in jello
on Aug 9, 2013 at 5:33:58 pm

Roland, that is brilliant, and so simple at the same time. I never knew you could do that with particle playground. Although I admit I don't use it much and tend to use Particular..

Erik Waluska
EAWmedia


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Roland R. Kahlenberg
Re: Particles in jello
on Aug 9, 2013 at 7:38:38 pm

Erik, it's easy cos' now you know how to do it. ;-)

I love PP for its property mappers feature and designing image grids.

Checkout this thread -> http://forums.creativecow.net/thread/2/1040538 on designing a grid using PP.

Cheers
RoRK

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects CS6 ACE/ACI


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