How to groom and generate fur heightmap?

Hello!
I’ve just been tasked with creating furry characters and during my research I found the paragon character Zinx which utilized a heightmap (Attached) to create the fine fur in the shader.
Which methods are available to groom and generate such a fur height map?
I’ve attached a screenshot of said height map.
Thank you!
// J

291770-furheightmap.png