This is a leftover from previous approach of hair collisions (with insufficient results). The hair volumetrics actually implements "collision" with solid objects as well, but uses a Neumann boundary condition on the main grid for this purpose.
This is a leftover from previous approach of hair collisions (with insufficient results). The hair volumetrics actually implements "collision" with solid objects as well, but uses a Neumann boundary condition on the main grid for this purpose.