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In-Reply-To: <list-4837685@media-motion.tv>
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From: Louai Abu-Osba <me@louai.org>
Date: Thu, 6 Sep 2012 15:35:50 -0400
Message-ID: <CABan1zNmDoDCRv8Yrb_-GauBAA=vcagh5i4QaZ7kBQJwpJhtUA@mail.gmail.com>
Subject: Re: [AE] "conditional" blending layers
To: After Effects Mail List <AE-List@media-motion.tv>
Content-Type: text/plain; charset=ISO-8859-1

I think so. You'd need to use an effect that allows you set blending
modes, and then use sampleImage() to detect when the layers overlap
and then set the effect properly. Take a look at
http://www.motionscript.com/design-guide/collision.html

It would probably run pretty slow. If expressions run too slow AE will
sometimes turn them off without telling you!

-louai

On Thu, Sep 6, 2012 at 2:28 PM, Teddy Gage <teddygage@gmail.com> wrote:
> How would I go about creating a "conditional" blending layer? What I mean is
> it possible to have say five circles called A,B,C,D,E randomly floating in
> space and overlapping, such that unless A is over B, A has "normal" blending
> mode, but when A overlaps B, it has an "add" blending mode? And then when A
> overlaps C it has multiply blending mode instead, just as an example? This
> is a puzzle...
>
> --
> Animator & Editor
> www.teddygage.com
> Brooklyn
>