How should I make a custom suspension system?

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I would like to make my own suspension system. Basically, it would be a wheel collider without the friction curves. So a simplified wheel collider. Probably faster and I don’t really want to mess with the friction curves, my game doesn’t need it, I would program the car’s handling on my own. Friction things just make it harder and really not needed for my arcade style physics I planned.

There are things that I already can’t figure out. I guess I need to raycast downward to suspension distance + wheel radius. But how can I position the parent rigidbody based on the raycast hit point? So I need a way to stop the rigidbody falling at the hit point. How it’s working with the original Wheel Collider component?

If I could do this, I should start to figure out the spring system. I have no idea about that too yet, but maybe I can figure it out.

1 Answer

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I can help you with making the wheel to move as a wheel with wheel collider’s suspension.

The below scipt is for each wheel.

public WheelCollider wc;

void FixedUpdate()
{
	RaycastHit hit;
	Vector3 wheelPosition;
	if (Physics.Raycast(transform.position, -transform.up, out hit, wc.radius + wc.suspensionDistance))
	{
		wheelPosition = hit.point + wc.transform.up * wc.radius;
	}
	else
	{
		wheelPosition = wc.transform.position - wc.transform.up * wc.suspensionDistance;
	}
	
	transform.position = wheelPosition;
}