The 3Delight Hair and Fur material is an artist friendly, yet physically plausible, hair and fur shader. Internally, the shader relies on a Monte-Carlo simulation to explore the different light paths inside a medium (in this case, a clump of hair) to produce an image. The complexity of this process is hidden from the artist which controls only high level shader parameters such as color and roughness. Below are four example renders of varying hair color. Note the glow caused by light scattering inside blond and light coloured red hair. Also note how black hair has nice silky features. The "glint" is caused by caustics inside hair strands and is not an after thought of the shading model. All these features necessitate proper simulation of light scattering in hair clumps. | 
