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Time remap using luminance or control layer

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chris monaco
Time remap using luminance or control layer
on Jun 6, 2018 at 4:15:28 pm

Hello,

I'm trying to figure out how to control time remapping of 45 flickering boxes by using the luminance of another layer or a script of some kind. Below is a video tutorial I found for scale but it is not exactly what I am trying to do.

45 boxes fill a 1920x1080 comp. I want to be able to animate a ramp in random places around the 1080 comp so that the smaller boxes will be triggered only in the area the gradient lives. I also want the boxes to animate off if the gradient moves out of it's vicinity.

I tried controlling this with a time displacement but it doesn't give the kind of control I am looking for. I am thinking I need help setting this up with some sort of control layer or something. Any ideas out there?

Thank you








Chris Monaco
Motion Graphics and VFX Artist
http://www.chrismonaco.tv


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Steve Bentley
Re: Time remap using luminance or control layer
on Jun 6, 2018 at 4:43:05 pm

First, each box would be a precomp and in the precomp would be a timeline of all the animations that box should do. Could you not then use expressions in the outer comp to sample the luminence at the spot a particular box sits at and then send the play head of that precomped box to the frame appropriate to that luminence level?



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chris monaco
Re: Time remap using luminance or control layer
on Jun 6, 2018 at 6:42:23 pm

Is there a way to do this with a script?

Chris Monaco
Motion Graphics and VFX Artist
http://www.chrismonaco.tv


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Cassius Marques
Re: Time remap using luminance or control layer
on Jun 6, 2018 at 8:29:18 pm

That's actually pretty simple. Its just one expression. I've made and example: 12434_sampleluma.aep.zip

Note that I'm guessing the luma source as greyscale, so I'm just sampling the Red value.

Cassius Marques
http://www.zapfilmes.com


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