I am trying to make an alka-zeltzer in a glass, creating bubbles that form a logo on the water surface. To do this I am using keyed particles and everything works fine.
However, I would like to have the particle's (object) size scale over each particle's lifetime. This is where I fail. I know the trick using a texture block with a color blend driving the particle's size, maybe against an object for mapping. It seems though that when using keyed particles, this is just ignored.
I'm wondering if I can get to a driver for the particle lifetime or age, as they must exist, because they are available as outputs on the particle-info node within cycles. Maybe I'm getting ahead of myself. This may be particle nodes territory. Is there a way around this?