Collision proxy demo! 💣 Snapping live strands to actual surface is not working well all the time, brush captures sharp surface features and breaks the stroke sometimes. So not it generates proxy volume based on head model, with smoother surface so strands can be placed with more controllable flow.
This is basic workflow loop here - draw strands on a model, then use move/groom tools to shape it. When collider is on, strands will not sink under surface when being manipulated.