[ODE] Calculating FDir1 For Vehicle Tires.

[Jeff Weber]

I'm attempting to use ODE's friction model for my vehicle tires.

What is the best way to calculate FDir1? I assume I can use Axis1's rotation 
to calculate this.

Also, has anyone used the "slip" parameters for the contact joint to 
successfully model vehicle wheel friction?

Any other hints and tips related to wheel friction are welcome.

-jeff





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