Unity鼠标滑动，使3D物体旋转的几种方法

目录

前言：

基于拖拽接口的：

基于鼠标点击：

触摸点滑动：

前言：

物体旋转是绕Y轴旋转

以下这些方法都适应于触摸屏

基于拖拽接口的：

适用于UI，脚本应该挂载在能检测射线的UI相关的组件上，例如：可以是canvas或者相关的ui组件下

适用场景：在一定范围内滑动，可旋转3D物体

using UnityEngine;
using UnityEngine.EventSystems;

/// 

/// 
/// * Writer：June
/// 
/// * Data：2021.6.21
/// 
/// * Function：拖拽3D物体
/// 
/// * Remarks：
/// 
/// 


public class Drag3DObject : MonoBehaviour, IDragHandler, IBeginDragHandler
{
    /// 

	/// 目标模型
	/// 
	public GameObject tarGetObj;
    /// 

    /// 当前帧所在位置
    /// 
    private Vector2 currentPos;
    /// 

    /// 上一帧所在位置
    /// 
    private Vector2 lastPos;
    /// 

    /// 旋转速度
    /// 
    [Range(5, 50)] public float rotateSpeed = 15;

    public void OnBeginDrag(PointerEventData eventData)
    {
        lastPos = eventData.position;
    }

    public void OnDrag(PointerEventData eventData)
    {
        currentPos = eventData.position;
        tarGetObj.transform.Rotate(Vector3.up, (lastPos.x - currentPos.x) * Time.deltaTime * rotateSpeed);
        lastPos = eventData.position;
    }
}

或

using UnityEngine;
using UnityEngine.EventSystems;

/// 

/// 
/// * Writer：June
/// 
/// * Data：2021.6.21
/// 
/// * Function：拖拽3D物体
/// 
/// * Remarks：
/// 
/// 


public class Drag3DObject1 : MonoBehaviour, IDragHandler
{
    /// 

	/// 目标模型
	/// 
	public GameObject tarGetObj;

    public void OnDrag(PointerEventData eventData)
    {
        tarGetObj.transform.localEulerAngles += new Vector3(0, -eventData.delta.x, 0);
    }
    
}

---

基于鼠标点击：

全局适用，不管程序在干嘛，滑动屏幕就会触发

using UnityEngine;

/// 

/// 
/// * Writer：June
/// 
/// * Data：2021.6.21
/// 
/// * Function：鼠标点击旋转
/// 
/// * Remarks：
/// 
/// 


public class MouseOnClickRotate : MonoBehaviour
{
    /// 

	/// 目标模型
	/// 
	public GameObject tarGetObj;
    /// 

    /// 当前帧所在位置
    /// 
    private Vector2 currentPos;
    /// 

    /// 上一帧所在位置
    /// 
    private Vector2 lastPos;
    /// 

    /// 旋转速度
    /// 
    [Range(5, 50)] public float rotateSpeed = 15;

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            lastPos = Input.mousePosition;
        }
        if (Input.GetMouseButton(0))
        {
            currentPos = Input.mousePosition;
            tarGetObj.transform.Rotate(Vector3.up, (lastPos.x - currentPos.x) * Time.deltaTime * rotateSpeed);
            lastPos = Input.mousePosition;
        }
    }
}

---

触摸点滑动：

只适用于触摸屏，鼠标测试是没有效果的

using UnityEngine;

/// 

/// 
/// * Writer：June
/// 
/// * Data：2021.6.22
/// 
/// * Function：触摸点控制旋转
/// 
/// * Remarks：鼠标测试不了，只能用于触摸屏，或者安卓
/// 
/// 


public class TouchRotate : MonoBehaviour
{
    /// 

    /// 目标物体
    /// 
    public GameObject targetObject;
    /// 

    /// 旋转速度
    /// 
    public float rotateSpeed;

    private void Update()
    {
        if (Input.touchCount >= 1)
        {
            if (Input.GetTouch(0).phase == TouchPhase.Moved)
            {
                float moveX = Input.GetTouch(0).deltaPosition.x;
                targetObject.transform.Rotate(moveX * -rotateSpeed * Time.deltaTime * Vector3.up);
            }
        }
    }
}