I know there are effects that work like this. Particle effects for example work based on the previous frame (or data from the previous frame). They usually render fast from the start, but take awhile if you try to cut into the middle (presumably because they have to calculate the prior frames).
You might be right though that there is no way to do it with pixel bender or expressions. For now, I am using screen grabs from another program running a life simulation.
Still curious if anyone has an idea how to make the plug-in work in AE. I’d like to get into Pixel Bender more. It seems really powerful.
Need a quick break from motion graphics?
Try my game Constellation at:
https://www.paperdragongames.com