by Vincent Le Moigne on July 01, 2016.
Start a new comp (Ctrl+N)
Select the main composition on the top of the tree and uncheck "Alpha Layer" to have a black background, it won't change anything, it is just a matter of aesthetics.
Simulate a particle system
system with 3D Layers>Points>Particles.
Set the particles system like a boss
Just do as on the pictures ... trust me....
Little Explanation and conclusion
Now you can disactivate/activate the particles systems to see a nice effect
As you may also see if you take the time to expand the
Change the opacity of the geometry vertices using an input attribute
modifier is that this preset is set with a Age vertex mask and that particles opacity will vary between 0% and 100% over it's lifetime following a sinus curve repeated 3 times. Good job old chap, you made it !