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Lukas Tönne db2ac79fc7 Radical simplification of the wind effect on hair, since the previous

approach does not work very well.

Using a cross section estimate still causes large oscillations due to
varying hair force based on angles. It also requires a sensible hair
thickness value (particle radius) which is difficult to control and
visualize at this point.

The new model is based purely on per-vertex forces, which seems to be
much more stable. It's also somewhat justified by the fact that each
hair vertex represents a certain mass.

Conflicts:
	source/blender/physics/intern/BPH_mass_spring.cpp

2015-01-20 09:30:09 +01:00