How can i create my own vector fields?

i dont have much money to spend on high end software like maya, how could i make a vector field that i can import into ue4 without spending any money on a high end programs?

i would do a google search, but my internet is really bad at night, so it takes ages to do a google search.

jangaFX.com has a fairly cheap one.

there is also: https://twitter.com/jkashaar/status/817331695833772032

(less than 6 seconds of google search btw)