Since hair collisions were integrated with the cloth solver (rBd42a7bbd6ea5), there are a couple of relevant settings which were not exposed to the User: - Collision Quality - Minimum Distance (this was reported in T73842, default of 0.015m was still limiting in certain scenarios - this can now be made smaller) - Impulse clamping - Collision collection This will add a 'Collisions' panel to Hair Dynamics with those settings Note: in contrast to 'real' cloth, self-collisions are not supported for hair Maniphest Tasks: T73842 Differential Revision: https://developer.blender.org/D7032