如何根据 Unity 中的速度调整转向角？

Question

我正在关注这个 (https://www.youtube.com/watch?v=kAEpLX3rfms) 视频，了解如何在 Unity 中制作汽车。但是我的车不会根据视频的速度降低转向角度。这个想法是你可以在最慢的时候以最大 50 度的角度驾驶汽车，然后以最快的速度转向 10 度。但是对车没有影响。有人可以告诉我如何解决这个问题吗？

代码：

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

我不是unity专家，但是看起来像

public float lowSpeedSteerAngle;
public float highSpeedSteerAngle;

可能是你的问题。除非我遗漏了什么，否则这些变量会被声明然后调用，而不会为它们分配任何值。

Answer 2

我假设您已经将 maxSpeed 设置为 kmph 或 mph，是吗？您应该注意 velocity.magnitude returns m/s 中的速度，需要将其转换为您在汽车脚本中用于速度的单位。如果是m/s到km/h，那么你可以将速度大小乘以3.6。如果是 m/s 到 miles/h 则将幅度乘以 2.2369362920544。所以你的 speedFactor 现在是

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

如何根据 Unity 中的速度调整转向角？

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