public Vector3 angularVelocity ;


The angular velocity vector of the rigidbody.

In most cases you should not modify it directly, as this can result in unrealistic behaviour.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public Material fastWheelMaterial; public Material slowWheelMaterial; public Rigidbody rb; public MeshRenderer rend; void Start() { rb = GetComponent<Rigidbody>(); rend = GetComponent<MeshRenderer>(); } void Update() { if (rb.angularVelocity.magnitude < 5) rend.sharedMaterial = slowWheelMaterial; else rend.sharedMaterial = fastWheelMaterial; } }