Vector paint

[James Cook]

in vector paint effect control (ctrl shift T) – set playback mode to ‘animate strokes’ and composite paint to ‘as matte’
you may need to set the playback speed to something around 20 (depending on the speed in which you painted your mask.

hope this helps. It’s used for revealing organic swirls etc. joss stone video etc. etc. you get the picture, cheers,

jamo

james . dogpatch

[Kathlyn Lindeboom]

You might also take a look at Timothy Kurkoski’s tutorial “Turning Paint into Masks”

https://www.creativecow.net/show.php?page=/articles/kurkoski_tim/paint_to_mask/index.html

Kathlyn Lindeboom
The Mistress of Mmmooooo!