Blender Git Commit Log

Smoothing function as a first feature in dedicated hair code.

This function is used in a number of places in the targeted algorithms.
It is a useful utility for parallel-transport of various properties
along a hair curve. With curled hair in particular the control curve
itself is otherwise too irregular to give usable results, for which the
smoothing offers an elegant solution.

The algorithm is described in detail in the paper "Artistic simulation
of curly hair":
http://graphics.pixar.com/library/CurlyHairA/paper.pdf