duck

using UnityEngine;
using System.Collections;

public class CarBetter : MonoBehaviour {


    public float maxSpeed = 100;
    public float enginePower = 200;
    public float minTurnForce = 1f;
    public float maxTurnForce = 4f;
    public float lateralGrip = 30;


    bool onGround;
    Vector3 oPosition;
    Quaternion oRotation;
    float h,v;


    void Start () {
        oPosition = transform.position;
        oRotation = transform.rotation;
    }

    void OnCollisionStay(Collision col)
    {
        if (Vector3.Angle(transform.up, Vector3.up) < 65)
        {
            onGround = true;
        }
    }

    void FixedUpdate()
    {
        if (onGround)
        {
            Vector3 localVelocity = transform.InverseTransformDirection(rigidbody.velocity);

            float currentSpeed = Mathf.Abs(localVelocity.z);
            float inverseSpeedFactor = Mathf.InverseLerp( maxSpeed, 0, currentSpeed );

            float accelPower = enginePower * inverseSpeedFactor;

            Vector3 accelForce = transform.forward * accelPower * v;
            Vector3 gripForce = -transform.right * lateralGrip * localVelocity.x;
            Vector3 sumForce = accelForce + gripForce;
            Vector3 turnTorque = currentSpeed * transform.up * h * Mathf.Lerp(minTurnForce, maxTurnForce, inverseSpeedFactor);

            rigidbody.AddForce( sumForce );
            rigidbody.AddTorque( turnTorque );

            Debug.DrawRay(transform.position, sumForce*0.1f, Color.red);


        }

        onGround = false;
    }

    void Update () {
        if (Input.GetKeyDown("r")) { Reset(); }
        v = Input.GetAxis("Vertical");
        h = Input.GetAxis("Horizontal");
      }

    void Reset()
    {
        transform.position = oPosition;
        transform.rotation = oRotation;
        rigidbody.velocity = Vector3.zero;
        rigidbody.angularVelocity = Vector3.zero;
    }

}