Particle arc effect

Scripting Issues
1

I’m trying to create a particle effect where a stream of particles is created at one point, arcs to another point, and then disappears, but there appear to be a few challenges involved.

First and foremost is particle destruction. It looks like the only two ways to kill particles are by giving them an initial lifetime or destroying their emitter with p.cleanup(). Do I have to numerically solve the diff eq for time for the particles to arrive at their terminus and make that when they’re destroyed?

2

The best solution appears to be to use elliptical arcs and define a LinearSinkForce with 1/r^2 falloff and magnitude constrained by the time you want it to take particles to travel from A to B, then calculate initial velocity according to Kepler.