Keymaster,
That's what I am doing now, but I find I am setting that up manually to get the masks I want.
I know I could switch out to Max scanline and pop it out there too, but being able to replicate the Max Object ID pass would save a lot of time.
Will there ever be a Max style Object ID pass in Corona?
If using After Effects it's pretty simple to use, versus the manual set-up of the Mask pass.