I'm sorry for a kind of question one should probably look up for himself, but really couldn't find it
I'm sure I've seen a number of flipbooks on Vimeo and tutorials, where guys have particles displayed as trails in viewport (using v?). How do I do that?
Yes ,One of the ways is to use v(velocity) vector ,Just Press D on the viewport for opening display options window and turn on velocity marker ,Also you can set another type of the particles display and point size on the Display options window 8)