Unity project to experiment with fur shaders. The basic idea behind this fur shader is that you extrude the mesh along its normals in steps. Each steps you change the transparency of the mesh by using some noise texture. This will make the fur get more and more transparent the further out your are from the mesh, making it look like hair straws.
So: extrude mesh, change transparency, extrude mesh, change transparency, extrude mesh, change transparency, and so on like +5 times. This is why fur shaders are so performance heavy because you are rendering the same mesh multiple times.