Question How do I make a custom wheel collider that doesn't just rely on motortorque?

I'm currently in the process of trying to make a car game and I am using a custom wheel collider and want to stop only having motortorque as the only way to input a command to the wheel. I am instead trying to get the wheel collider to reach a certain rpm and using torque for acceleration and moving the car while it has a load. I have no idea how i would implement this though so I would appreciate suggestions and help.

 

Is it like starting a manual car? Or like starting an electronic car?

 

How did you get the wheels rpm? From wheel speeds?
If you get the wheels rpm from wheels speed. I think you need to fix it there. Because the wheels are usually spinning idle.(It depends on the driver, location and case. But in the game world, the wheel is basically slipping← have you ever seen a tire not slipping in the game?) If you get the wheels rpm from wheel speed, the power does not go to the wheel enough, so it may be stocked.

 

If I understand correctly, you want to use the wheel RPM as an input instead of the motor torque. If that's the case, you can calculate the force required and apply it to the Rigidbody of the vehicle and spin the tires separately using the Rigidbody.AddTorque method. To achieve this, I recommend implementing a suspension system that works with the rigidbody. You can find a great example of this in this video:

. To calculate the traction force, you can use the formula F = Torque / Wheel Radius. For a more detailed understanding of the physics and calculations involved, you can refer to this resource: https://www.physicsforums.com/threads/calculating-wheel-torque-from-engine-torque.870677/#:~:text=Traction%20force%20%3D%20Torque%20%2F%20Wheel%20radius,by%2060%20seconds%20*%202Pi%20radians..

 

It's meant to be a DCT so there wouldn't be a clutch and I'd most likely implement a script to convert it to automatic at a later date.

 

I'm currently getting the wheel rpm from the angular velocity and I haven't noticed the wheels slipping.

 

Thanks! I'll see if this solution works for me.