Thanks for help… this technique is close to what I need… but still not exactly what I need…
particles need to move in straight line from A to B and A and B are constantly changing position. Like, particles will make a line of particles between these two points, moving from A to B and dying when reach B.
Anyway, thanks for advice… seems particular is not the best way to achieve this effect… kinda have to be done is some 3d program.