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Question by APProjects · Nov 09, 2013 at 05:13 PM · rigidbodyraycastwheelcollidersuspensionhitpoints

How should I make a custom suspension system?

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.

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Answer by Mewada-Neil · Apr 20, 2015 at 06:03 PM

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;
 }
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