Help creating Painting System Similar to Neighbors

Does anyone know how to achieve the smoothness of neighbor’s spray paint system?

Neighbors Spray Paint

I’ve tried looking through the devforum for any clues on how to make a painting system similar to neighbor’s spray paint, but i couldn’t find anything on devforum related to neighbor’s spray paint.

For context:
I’ve tried creating one myself but its not as smooth as neighbor’s spray paint and extremely inefficient.
My script uses 3D flat circle meshes with a mix of raycasting and positioning.