VEX Hair shader

This shader is based on the illumination model presented in 'Fake Fur Rendering', Siggraph Proceedings 1997.

This shader is based on the illumination model presented in 'Fake Fur Rendering', Siggraph Proceedings 1997. The shader is intended for use on open polygon, NURBS or Bezier curves.

Turning off the 'Compute Shadows' toggle will prevent shadows from being computed which can speed up render times significantly (depending on whether ray-traced shadows are being used).