I'm trying to get the particles to appear on screen, stop and stay. I've seen it done before. i've tried adjusting the birth rate, longevity, gravity, resistance and velocity and I've only been able to slow them down. I need them to stop. I would like to use particle world, but if particle system 2 does it, that's fine also. any suggestions, or point me in the right direction would be greatly apreciated.
If you want particles to be static from the very beginning, then in either CC Particle System II or CC Particle World set Velocity and Gravity to 0 and increase Longevity according to the duration you need.
If you want particles would start with some velocity and then freeze their motion, set Gravity to 0 and increase Resistance. However, ratio Velocity/Resistance in CC Particle System II and CC Particle World will be different. E.g. if you start with Velocity = 0.5, then Resistance = 4 is enough to freeze particles motion within 4 seconds in Particle World, but should be about 30 in Particle System II.
Animate Birth Rate to limit the amount of existing particles.