Re: Patch for wheel spin velocity traction

Hi,

Drive this one also. 

----- David Savinkoff wrote:
> Hi Bernhard,
> 
> Please apply this patch; which makes for better maneuvering while
> drifting and overtaking in corners. 
> 
> What I found interesting with the line of code:
> sx = (vt - wrl) / fabs(vt);
> 
> Is that:
> sx = (car_velocity - wheel_spin_velocity = slip_velocity) / car_velocity;
> Has no [units] and is 'with respect to' car_velocity.
> This works well with braking because the wheel_spin_velocity is less
> than the car_velocity.
> 
> When wheel_spin_velocity is faster than car_velocity, it appears that this
> unitless value works better with respect to wheel_spin_velocity.
> 
> Thus:
> sx = (vt - wrl) / ( MAX(fabs(vt) , fabs(wrl)) );
> 
> Sincerely,
> David Savinkoff

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--- torcs-1.3.6/src/modules/simu/simuv2/wheel.cpp	2015-03-31 11:21:12.497806674 -0700
+++ torcs-1.3.6/src/modules/simu/simuv2/wheel.cpp	2015-03-31 10:57:02.552917891 -0700
@@ -301,7 +301,7 @@
 		wheel = &(car->wheel[i]);
 		wheel->spinVel = wheel->in.spinVel;
 
-		RELAXATION2(wheel->spinVel, wheel->prespinVel, 50.0f);
+		RELAXATION2(wheel->spinVel, wheel->prespinVel, 74.1f);
 
 		wheel->relPos.ay += wheel->spinVel * SimDeltaTime;
 		NORM_PI_PI(wheel->relPos.ay);