Problems with Vehicle - Tyres slipping with more torque?

Hi all,

I have a vehicle driving around and have implemented gears in hope to allow it to go faster.

With each gear (switch case) the torque is set but in the higher gears the tyres are slipping. I've tried setting the friction higher but it doesn't seem to help.

What variables should I be changing or functions should I be running?

Any help would be greatly appreciated.

anyone?

Try Using "Raycast car" - it solve most problems

I can't really find much on it and no working examples.. I already have base code with everything working except the car's speed due to the torque and wheels slipping.

I've changed the friction and it still speeds up a bit but still seems to slip.. >_>

Hi, i have a similar problem.

No matter how high i set the torque, it still maintaining at the same speed. Can anyone guide us on which variables we should change?

Thx in advance

Hi, i have a similar problem.

No matter how high i set the torque, it still maintaining at the same speed. Can anyone guide us on which variables we should change?

Thx in advance

I found a material pair helps

mPair = new OgreNewt::MaterialPair(m_World, defMat, mCar->vehMat);
mPair->setDefaultFriction(5.0f, 5.0f);
mPair->setDefaultElasticity(0.0f);

then in simple vehicle usercallback ()

tire->setMaxSideSlipSpeed( speed * 0.1f );
tire->setSideSlipCoefficient( speed / 200.0);

speed = tire->getLongitudinalSpeed();

tire->setMaxLongitudinalSlipSpeed( speed * 1.0);
tire->setLongitudinalSlipCoefficient( speed / 10.0);

hope it helps.

Hi batnom,

Thx for the help. I'm still very new to both Ogrenewt and Newton.
But i not sure what are the defMat and vehMat should be and where they should be define. I tried setting usercallback() with ur code, but the speed is still the same.

in OgreNewtonApplication constructor

// materials
defMat = new OgreNewt::MaterialID(m_World);

when creating the collision body in create scene

bod2->setMaterialGroupID(defMat);

in simplevehicle constructor

// materials
vehMat = new OgreNewt::MaterialID(mWorld);

in simplevehicle setup

// apply a mat - materials
m_chassis->setMaterialGroupID(vehMat);

i think that should do it.

Thanks again.

I tried it. Its affecting the speed very little, but i guess its a start.
I will play around with the value. Really thanks alot ^^

You might also try:
- Wider wheels
- Longer wheels (more surface touching the ground)
- Using more complicated calculation (like adding an impulse to the wheel to make it gain torque or even just adding a force to the vehicle and bypass the wheels altogether, they will just roll along as the vehicle is pushed)

add one line for every frame: m_chassis->setOmega(Vector3(0,0,0));

So the problem is solved!!!