如何根據Unity中的速度調整轉向角？

Question

我正在關注如何在Unity中製作汽車的這段視頻（https://www.youtube.com/watch?v=kAEpLX3rfms）。但是我的車不會根據視頻的速度降低轉向角度。這個想法是，你可以在最慢的時候將汽車轉向最大50度，然後以最快的速度轉向10度。但它對汽車沒有影響。有人能告訴我如何解決這個問題嗎？

代碼：

public WheelCollider wheelFL; 
public WheelCollider wheelFR; 
public WheelCollider wheelRL; 
public WheelCollider wheelRR; 

public Transform wheelFL_Trans; 
public Transform wheelFR_Trans; 
public Transform wheelRL_Trans; 
public Transform wheelRR_Trans; 

public float lowSpeedSteerAngle; 
public float highSpeedSteerAngle; 
public float Torque; 
public float centerOfMassHeight; 

public float speed; 
public GameObject speedometer; 
public GameObject accelerator; 
public GameObject brake; 
public float pedalRotationFactor; 
public float speedometerRotationFactor; 
public float decelerationRate; 

public float currentSpeed; 
public float topSpeed; 
public float maxReverseSpeed; 

public GameObject trunk; 
public Material[] brakeMaterials; 

public float currentSteerAngle; 
public float turnAmount; 

private Vector3 com; 
private Rigidbody rigidBody; 
private float acceleratorSpeed; 
private float brakeSpeed; 

void Start() { 
    rigidBody = GetComponent<Rigidbody>(); 
    com = rigidBody.centerOfMass; 
    com.y = centerOfMassHeight; 
    rigidBody.centerOfMass = com; 
} 

void FixedUpdate() { 
    currentSpeed = 2 * Mathf.PI * wheelFL.radius * wheelFL.rpm * 60/1000; 
    if(currentSpeed < topSpeed && currentSpeed > -maxReverseSpeed){ 
     wheelFL.motorTorque = Torque * Input.GetAxis("Vertical"); 
     wheelFR.motorTorque = Torque * Input.GetAxis("Vertical"); 
     wheelRL.motorTorque = Torque * Input.GetAxis("Vertical"); 
     wheelRR.motorTorque = Torque * Input.GetAxis("Vertical"); 
    }else{ 
     wheelFL.motorTorque = 0; 
     wheelFR.motorTorque = 0; 
     wheelRL.motorTorque = 0; 
     wheelRR.motorTorque = 0; 
    } 


    if(!Input.GetButton("Vertical")){ 
     wheelFL.brakeTorque = decelerationRate; 
     wheelFR.brakeTorque = decelerationRate; 
     wheelRL.brakeTorque = decelerationRate; 
     wheelRR.brakeTorque = decelerationRate; 
    }else{ 
     wheelFL.brakeTorque = 0; 
     wheelFR.brakeTorque = 0; 
     wheelRL.brakeTorque = 0; 
     wheelRR.brakeTorque = 0; 
    } 

    if(Input.GetAxis("Vertical") < 0){ 
     //Changing The Materials 
     Material[] mats = trunk.GetComponent<Renderer>().materials; 
     mats[0] = brakeMaterials[1]; 

     trunk.GetComponent<Renderer>().materials = mats; 
    }else{ 
     //Reseting The Materials 
     Material[] mats = trunk.GetComponent<Renderer>().materials; 
     mats[0] = brakeMaterials[0]; 

     trunk.GetComponent<Renderer>().materials = mats; 
    } 

    speed = GetComponent<Rigidbody>().velocity.magnitude * 15; 
    float speedFactor = 1 - (GetComponent<Rigidbody>().velocity.magnitude * 3.6f/topSpeed); 
    currentSteerAngle = highSpeedSteerAngle + ((lowSpeedSteerAngle - highSpeedSteerAngle) * speedFactor); 
    turnAmount = currentSteerAngle * Input.GetAxis("Horizontal"); 
    wheelFL.steerAngle = turnAmount; 
    wheelFR.steerAngle = turnAmount; 
} 

void Update() { 
    wheelFL_Trans.Rotate(0, 0, wheelFL.rpm/60 * 360 * Time.deltaTime); 
    wheelFR_Trans.Rotate(0, 0, wheelFR.rpm/60 * 360 * Time.deltaTime); 
    wheelRL_Trans.Rotate(0, 0, wheelRL.rpm/60 * 360 * Time.deltaTime); 
    wheelRR_Trans.Rotate(0, 0, wheelRR.rpm/60 * 360 * Time.deltaTime); 

    Vector3 wheelSteerAngle = wheelFL_Trans.localEulerAngles; 
    wheelSteerAngle.y = turnAmount + 90; 
    wheelFL_Trans.localEulerAngles = wheelSteerAngle; 
    wheelFR_Trans.localEulerAngles = wheelSteerAngle; 

    if(Input.GetKeyDown(KeyCode.P)){ 
     Vector3 resetPosition = new Vector3(transform.position.x, 1.5f, transform.position.z); 
     Quaternion resetRotation = Quaternion.Euler(0f, 0f, 0f); 

     //Reseting Velocity 
     GetComponent<Rigidbody>().velocity = new Vector3(0f, 0f, 0f); 

     //Reseting Rotation 
     transform.rotation = resetRotation; 

     //Reseting Position 
     transform.position = resetPosition; 

     //Reseting Motor Torque and Steering Angle 
     wheelFL.motorTorque = 0f; 
     wheelFR.motorTorque = 0f; 
     wheelRL.motorTorque = 0f; 
     wheelRR.motorTorque = 0f; 

     wheelFL.steerAngle = 0f; 
     wheelFR.steerAngle = 0f; 
     wheelRL.steerAngle = 0f; 
     wheelRR.steerAngle = 0f; 
    } 

    acceleratorSpeed = wheelFL.motorTorque; 
    brakeSpeed = wheelFL.motorTorque; 

    if(acceleratorSpeed < 0){ 
     acceleratorSpeed = 0; 
    } 

    if(brakeSpeed > 0){ 
     brakeSpeed = 0; 
    } 

    if(speed >= 350){ 
     speed = 350; 
    } 

    speedometer.transform.localRotation = Quaternion.Euler(speed * speedometerRotationFactor - 100, 90f, 0f); 
    accelerator.transform.localRotation = Quaternion.Euler(acceleratorSpeed * pedalRotationFactor, 0f, 0f); 
    brake.transform.localRotation = Quaternion.Euler(brakeSpeed * pedalRotationFactor * -1, 0f, 0f); 

} 

Answer 1

我假設你設置了kmph或mph的maxSpeed，是嗎？您應該注意velocity.magnitude以m/s爲單位返回速度，需要將其轉換爲您在汽車腳本中用於加速的單位。如果是米/秒至公里/小時，則可以將速度大小乘以3.6。如果是米/秒到英里/小時，那麼乘以2.2369362920544。所以，你現在speedFactor將

float speedFactor = GetComponent<Rigidbody>().velocity.magnitude * 3.6f/maxSpeed; //or magnitude * 2.236936f for miles/h 

Answer 2

我不是在單位的專家，但它看起來像

public float lowSpeedSteerAngle; 
public float highSpeedSteerAngle; 

可能是你的問題。除非我遺漏了一些東西，否則這些變量會被聲明並被調用，而不會爲其分配任何值。