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Painting water flow using vertex paint?

Looking for a way to control flow of my water, specifically, using vertex paint to do it.
If anyone has any good tutorial or knows how to… please let me know

Not possible with vertex paint. Flow maps are literally painting direction, with vertex paint you’re painting whatever color you picked. You’ll need to find a different way to author your flow maps.

Ryan Brucks did show in-editor painted flowmaps a few weeks ago.

You could just have the RGB of your vertex color represent the XYZ vector of the water flow probably.