Blender Git Commit Log

Implementation of the Kajiya-Kay shading model for hair strands.

This is a common simple shading model defined by Kajiya and Kay in
"Rendering fur with three dimensional textures." (1989)

This model in particular defines specular highlights for reflective
thin cylinders (strands), which gives a much more hair-like appearance
in the viewport. More advanced models (Marschner et. al.) improve this
further, in particular the diffuse term.