Actually, instead of using an effect to set the blending mode, you
could have duplicates of each layer, each set with the blending modes
you want, and then using the collision expression to turn their
opacity on and off so the one you want is blending. I think...

On Thu, Sep 6, 2012 at 3:35 PM, Louai Abu-Osba <me@louai.org> wrote:

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

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