Improve constraint solver friction model and expose and document settings

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See discussion here:
http://www.bulletphysics.com/Bullet/phpBB3/viewtopic.php?f=9&t=3081

In Bullet 2.73 sp1, Bullet used a velocity dependent friction model, which 
allows the object to slide in arbitrary directions, but it has rotation 
artifacts.

1) expose advanced friction options, so developer can tweak 
performance/behaviour
2) add central friction, to allow object to slide in arbitrary directions 
without rotating
3) add demo to let developer experiment with various options

Thanks to Martijn Reuvers for bringing this up, and to create a test case

Original issue reported on code.google.com by erwin.coumans on 20 Jan 2009 at 1:20

Attachments:

• BasicDemo.cpp
• BasicDemo.h
• main.cpp

[GoogleCodeExporter]

Fix and friction options have been added. Docs will follow in Bullet 2.75.

Original comment by erwin.coumans on 3 Mar 2009 at 11:19

• Added labels: Milestone-2.75
• Removed labels: Milestone-2.74

[GoogleCodeExporter]

We will add further friction settings in this wiki page:

http://bulletphysics.org/mediawiki-1.5.8/index.php/BtContactSolverInfo

Original comment by erwin.coumans on 20 Jan 2010 at 4:16

[GoogleCodeExporter]

Implemented, see above wiki link

Original comment by erwin.coumans on 31 Aug 2010 at 1:35

• Changed state: Fixed