how to represente flow or air ?

anyone with some tricks to represent
some air flow in a duct or room ?

was not there an SVN to do something like that ?

thanks
happy cl

you mean to draw manually !

a bit tedious but could also also the new curve draw

happy cl

Some nice results here: https://www.youtube.com/watch?v=WXq2fdArijM

Could also try via dynamic paint with flowing particles.

that is an interesting way to fake it

have to find a way to show this in cycles !

thanks
happy cl