Rigidbody.angularVelocity

설명

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;
    }
}