Wheel damper problem....

[maxjoiner 284]

Hi all...

I done a new vehicle for ArmA3, It works fine but a wheel has this follow bug....

I used Phoenix's tutorial and tools for wheels parameters:

wheelCircumference = 2,685 m

vehicleMass in kg 2116

Tire Radius = 427 mm

Number of tires 4

this is my config (wheels):

               simulation = "carx";
	dampersBumpCoef = 3.0;
	differentialType = "all_limited";
	frontRearSplit = 0.5;
	frontBias = 1.5;
	rearBias = 1.5;
	centreBias = 1.3;
	clutchStrength = 15.0;
	enginePower = 131;
	maxOmega = 700.32;
	peakTorque = 500;
	dampingRateFullThrottle = 0.08;
	dampingRateZeroThrottleClutchEngaged = 0.35;
	dampingRateZeroThrottleClutchDisengaged = 0.35;
	torqueCurve[] = {{0.0, 0.0}, {0.25, 0.65}, {0.3, 0.8}, {0.5, 0.95}, {0.7, 1.0}, {0.8, 0.9}, {0.9, 0.8}, {1.0, 0.5}};
	changeGearMinEffectivity[] = {0.95, 0.15, 0.95, 0.95, 0.95, 0.95, 0.95, 0.95};
	switchTime = 0.31;
	latency = 1.5;
               wheelCircumference = 2.685;
	antiRollbarSpeedMin = 10;
	antiRollbarSpeedMax = 120;
	antiRollbarForceCoef = 5;
	antiRollbarForceLimit = 20;

	class Wheels {
		class LF {
			boneName = "wheel_1_1_damper";
			steering = 1;
			side = "left";
			center = "wheel_1_1_axis";
			boundary = "wheel_1_1_bound";
			width = 0.126;
			mass = 40;
			MOI = 2.8;
			dampingRate = 0.1;
			maxBrakeTorque = 2000;
			maxHandBrakeTorque = 0;
			suspTravelDirection[] = {0, -1, 0};
			suspForceAppPointOffset = "wheel_1_1_axis";
			tireForceAppPointOffset = "wheel_1_1_axis";
			maxCompression = 0.15;
			mMaxDroop = 0.1;
			sprungMass = 529; 
			springStrength = 13225; 
			springDamperRate = 2116;
			longitudinalStiffnessPerUnitGravity = 10000;
			latStiffX = 25;
			latStiffY = 180;
			frictionVsSlipGraph[] = {{0, 1}, {0.5, 1}, {1, 1}};
		};

			class LR : LF {
			 boneName = "wheel_1_2_damper";
			steering = 0;
			center = "wheel_1_2_axis";
			boundary = "wheel_1_2_bound";
			suspForceAppPointOffset = "wheel_1_2_axis";
			tireForceAppPointOffset = "wheel_1_2_axis";
			maxHandBrakeTorque = 3000;
		};

		class RF : LF {
			boneName = "wheel_2_1_damper";
			center = "wheel_2_1_axis";
			boundary = "wheel_2_1_bound";
			suspForceAppPointOffset = "wheel_2_1_axis";
			tireForceAppPointOffset = "wheel_2_1_axis";
			steering = 1;
			side = "right";
		};

		class RR : RF {
			boneName = "wheel_2_2_damper";
			steering = 0;
			center = "wheel_2_2_axis";
			boundary = "wheel_2_2_bound";
			suspForceAppPointOffset = "wheel_2_2_axis";
			tireForceAppPointOffset = "wheel_2_2_axis";
			maxHandBrakeTorque = 3000;


		};
	};

[x3kj 1247]

memorypoints of your wheels in p3d could be wrong, make sure center and boundary point are exactly matching each other.

It looks like your physx vehicle wheels are too large (doesnt matter what you use in wheelcircumference, wont change physx behaviour).

[maxjoiner 284]

I checked all wheels memory points.... I done some changing, and now the problem is passed on the other rear wheel.......

About the big rear wheels, they are two wheels together for rear sides.....but they are an only object....

I put the wheel_axis points on the first rear wheel for both sides....

previously they covered both the rear wheels.....

[x3kj 1247]

make one point for each center and boundary point individually (no shared point), and also make it so that the center point for each wheel is exactly above the boundary point.

You can see the wheelcontact point if you use arma3diag.exe (and enable EPEVehicles display)

The width of your tire is not important, i meant the diameter for (nonvisible) physx wheel instance. It's too large, propably because of your memory points - idk.

[maxjoiner 284]

thanks for your advice, I fixed decreasing the rear wheels in geometry lod and puting the memory points "wheel_X_X_bound"

under at center of the first rear wheels.....