@Aurinko:
Do you know the firefly particle? I think you mean like that, just faster.
&, how big should it be? I mean, if you want it to cover a big area or a smaller one.
Sure I know this particle, but they don't go ALL in the same direction in the same time. And I think it can be big... as the half of the firefly, maybe ? Or with smoke ? You see what is well (: But it's for a big area, yep ^^ And it isn't obligatory faster, the rapidity can be different ^^ Thanks ! <3