Racking my head to get a hemisphere emitter with accelerating billboards towards the center point, it's easy to slow-in toward a point with dampen and velocities but the concept of a negative dampen seems impossible technically unless scripts are added obviously legacy systems solves this... but does anyone have a mobile…
I think i got something like this to work, if i understand what you're asking correctly. If you make the speed a curve that goes from a negative value to 0 and time the lifetime correctly you should get something that goes toward the center of the sphere quickly and then disappear. The only thing is that the duration has…