Thanks for the reply.
Basically I would like to draw a bezier path with the pen tool and set particles to flow along this path with the ability to control particle velocity, look, size, direction etc…
I typically create particle motion in 3d, but would like the same kind of control in AE to create similar effects in the 2d world. Ideally, I would like to be able to use any object as a particle.
For instance:
several fish swimming up a curvy stream,
or a grainy liquid traveling inside a curvy tube.
That kind of thing.
Thanks,