[Opensim-dev] BulletSim tweaks for walking up stairs

[Mister Blue]

BulletSim recently received some tweaks for walking up stairs. I've done
some testing but there are so many different types of stairs out there that
I need some feedback on the effectiveness of these changes.

Some differences you should see are:
-- the avatar shouldn't pop-up as much as it moves over the step
-- small edges or bumps on the ground shouldn't act likes walls
-- the step approach angle works for any frontal approach[1]

Most of the changes are in the step movement parameters[2] so you can tweak
them to find better values.

Please report any problems and suggestions for improvement.

-- mb

[1] SL is very generous in the definition of a step and even lets one walk
backward up a staircase. Try that in RL! For the moment, BulletSim only
considers a frontal approach to a step to move the avatar up.
[2] Documented at "
http://opensimulator.org/wiki/BulletSim#Avatar_Walking_Up_Stairs" and now
in OpenSimDefaults.ini.
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