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Blurring 3d objects below a plane

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Kate Colmer
Blurring 3d objects below a plane
on Feb 20, 2020 at 4:17:58 am

I'm trying to blur all objects below a floor. I have some 3d objects rising up through it. I don't want to keyframe the blur as they transition through the floor as I want you to be able to see the hard line where they transverse the plane.

Ideas?



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Cassius Marques
Re: Blurring 3d objects below a plane
on Feb 20, 2020 at 1:52:39 pm

In simple steps it would be:

Duplicate comp, tint the floor plane white (without alpha), tint everything else black (the floor layer with alpha also - above the plane). Use as luma matte for a blur.

This may require extra steps to account for any possible problems that can arise. But I'd have to see them before addressing them.

Cassius Marques
http://www.zapfilmes.com


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Kate Colmer
Re: Blurring 3d objects below a plane
on Feb 20, 2020 at 3:32:06 pm

Copy that. To be honest, I was hoping there was a secret adjustment layer hack that would make it work in 3d space vs layer stack rules. One layer, add Box blur and we're done!

We'll see how it goes... Thanks for the help.


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Cassius Marques
Re: Blurring 3d objects below a plane
on Feb 20, 2020 at 5:18:07 pm

yeah me too, but that would require it to affect layers that may be above it on the timeline thus breaking the compositing logic. There's several "buts" with that existing if we think about it, but indeed I've wished for it many times.

Once you get the hanging of duplicating with connections its very fast to get this node based compositing behavior into AE's pipeline.

Cassius Marques
http://www.zapfilmes.com


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