I have a solid layer, to which I've applied a Particle Playground simulation. I've pointed the gun 90 degrees and things operate as I expect, with my particles coming out and then falling down (I have gravity). This is good -- it's supposed to look like a waterfall.
What I'd like is to have a loooong motion blur (say, 20 pixels) on each particle. I can apply an actual motion blur, but it doesn't blur 'em nearly as much as I would like. When I try a directional blur, that, of course, only works in one predefined direction.
If I just throw a bunch of keyframes in there (with the direction-blur angle monkeyed with as they go over the edge), I get an effect that looks like 20-pixel sticks going over a waterfall. I'd like the lines to follow the curve of the particles. (I guess I could also add blur-length variables to these tight-curve keyframes such that as the particles go over the curve, their blur length shortens -- oooooh, that seems like a hack).
On a slightly related note, can gravity effect foam? I tried making a waterfall of tiny bubbles, but they just blew all over the screen -- I couldn't get them to "fall".
"Cut a hole in the door. Hang a flap. Criminy, why didn't I think of this earlier?!" -- inventor of the cat door