Thanks to all of you.
The differents ways seems interesting, reversing the animation seems a good way. I’ll try, and see the best for what I want.
My main problem is to join this one point to the object. So I think I will divide it in two part : emmit from one point and reverse the animation emmit from the object layer. The particles should joint in the middle.
But it’s kind of hard to manage particles in 3d space. Do you have an tips about that ?
I don’t think there’s a way to give them a 3d-path in After fx ?
Thanks again