That's what the pixel coverage framebuffer is supposed to help with.

On Thu, Oct 18, 2012 at 4:49 PM, Byron Nash <byronn...@gmail.com> wrote:

> Won't you run into the problem that the Object ID's are aliased? That's
> why I never pursued much in that direction regarding after effects. You
> would just end up with poor mattes. I'm interested to hear how you worked
> around that.
>
> What I would really prefer is a multi-channel EXR out of soft with user
> definable mattes per channel. Just one grayscale channel per object would
> be nice. We use a lot of RGB mattes with AE and it works well, I just wish
> I could get many more layers out of one seqeunce.
>
>

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