如何为对象的旋转设置 2 个限制？

Question

当按住 D 向上和 W 向下时，我需要使对象在 z 轴上旋转，但限制了两个方向的旋转，使用下面提供的代码我设法使对象在按下时旋转，但确实如此当达到我的变量设置的 2 个限制中的任何一个时，不会停止旋转。

我是编码领域的新手，希望您能帮助我解决和理解我的问题。提前感谢您的宝贵时间。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GyroDiscControls : MonoBehaviour{

public GameObject AltNeedleBright;
public float MaxAltNeedleRotation = -65f;
public float MinAltNeedleRotation = 135f ;
public void update (){

if (Input.GetAxisRaw("Vertical") > 0 & 
AltNeedleBright.transform.rotation.z > MaxAltNeedleRotation)
    {
        AltNeedleBright.transform.Rotate(0f, 0f, +15f * Time.deltaTime);
    }
if (Input.GetAxisRaw("Vertical") < 0 & 
AltNeedleBright.transform.rotation.z < MinAltNeedleRotation)
    {
        AltNeedleBright.transform.Rotate(0f, 0f, -15f * Time.deltaTime);
    }

}

Answer 1

首先你正在处理Quaternion。 Quaternion 有 4 个组件 x、y、z 和 w，并且在此处的行为不像您期望的那样 - 永远不要直接更改或检查 rotation.z 值。

第二个错误：transform.Rotate 默认在 local Space 中进行旋转.. 所以检查transform.rotation 无论如何都是错误的.. 如果它应该是transform.localRotation。

那么您实际要检查的值是transform.localEulerAngles 或eulerAngles。

---

一个简单的替代方法是存储已经旋转的值并对其进行钳制：

// Your naming is very confusing ... Min should be the smaller value
public float MaxAltNeedleRotation = 135f;
public float MinAltNeedleRotation = -65f;

private float alreadyRotated = 0;

public void update ()
{ 
    var direction = 0;

    // use && here .. you don't want to do a bitwise & on bools
    if (Input.GetAxisRaw("Vertical") > 0 && alreadyRotated < MaxAltNeedleRotation)
    {
        direction = 1;
    }
    // use else if since anyway only one of the cases can be true
    else if (Input.GetAxisRaw("Vertical") < 0 && alreadyRotated > MinAltNeedleRotation)
    {
        direction = -1;
    }

    // use the rotation and riection
    // but clamp it so it can minimum be MinAltNeedleRotation - alreadyRotated
    // and maximum MaxAltNeedleRotation - alreadyRotated
    var rotation = Mathf.Clamp(direction * 15f * Time.deltaTime, MinAltNeedleRotation - alreadyRotated, MaxAltNeedleRotation - alreadyRotated);

    if(rotation != 0)
    {
        AltNeedleBright.transform.Rotate(Vector3.forward * rotation);

        // update the alreadyRotated value
        alreadyRotated += rotation;
    }
}

Answer 2

public GameObject AltNeedleBright;
float MaxAltNeedleRotation = 135f; //smaller than this
float MinAltNeedleRotation = -65f; // bigger than this
public void Update ()
{
    float zAxis = AltNeedleBright.transform.localRotation.eulerAngles.z;
    float input = Input.GetAxisRaw("Vertical"); //Returns -1 or 1
    if(input > 0 && WrapAngle(zAxis) < MaxAltNeedleRotation)
    {
        AltNeedleBright.transform.Rotate(0, 0, 15 * Time.deltaTime);
    }
    if(input < 0 && WrapAngle(zAxis) > MinAltNeedleRotation)
    {
        AltNeedleBright.transform.Rotate(0, 0, -15 * Time.deltaTime);
    }
}

private static float WrapAngle(float angle)
{
    angle %= 360;
    if(angle > 180)
        return angle - 360;

    return angle;
}