On Thu, Sep 6, 2012 at 2:48 PM, Zack Lovatt <zack@zacklovatt.com> wrote:

This is messy, but:

- create a precomp for each non-normal blend combination (so, B-over-A in which A is added, A-over-C in which A is overlayed, etc)
- create a precomp for each overlap scenario, with black and white to create mattes
- in your master comp, using multiple instances of the calculations effect and your mattes have each circle get knocked out wherever there is an overlap
- in your master comp, bring in the overlap precomps and only have them in where the mattes dictate

I think this makes sense. Not at a computer at the moment, but let me know if this needs clarification.

This is where a node-based compositing package would really come in handy!

Zack

On Sep 6, 2012 2:29 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