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griffithinfotech / quickb2

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Tire Friction #35

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
Hi dug :)

you use a single friction value for a tire. 
you should add a lateralFriction value.

so you may use "friction" for the torque force and "lateralFriction" for 
steering force.

so inside the carbody update you should have:

const tireFric:Number = tire.friction * frictionMultiplier;
var fricForce:Number = tireFric * tireLoad;

and also

const latTireFric:Number = tire.lateralFriction * frictionMultiplier;
var latFricForce:Number = latTireFric* tireLoad;

then you should change the lateral component of the tire speed

from:
    if ( force > fricForce)
    {
        tire._isSkidding = true;
        force = fricForce;
    }
to:
    if ( force > latFricForce)
    {
        tire._isSkidding = true;
        force = latFricForce;
    }

a wheel got a different friction, and generally the longitudinal << lateral.

Original issue reported on code.google.com by magi...@gmail.com on 28 Aug 2011 at 10:17