關於Unity3D中滑鼠移動指定物體的解決方案

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一、滑鼠拾取物體的原理

在Unity3D當中，想要在觀察面(Aspect)中拾取物體(有碰撞屬性)的方法一般如下：

1、聲明一個觀察的攝像機、一個從攝像機原點出發的射線Ray以及一個用於檢測碰撞的RaycastHit；

2、將射線Ray定義為從攝像機原點出發並且指向當前滑鼠所在的座標(螢幕座標)；

3、定義碰撞RaycastHit為射線Ray與有碰撞屬性的物體的碰撞點。

具體代碼實現如下(C#代碼)：

using System.Collections;using System.Collections.Generic;using UnityEngine;public class camera : MonoBehaviour{    public Camera ca;    private Ray ra;    private RaycastHit hit;    // Use this for initialization    void Start()    {    }    // Update is called once per frame    void Update()    {            ra = ca.ScreenPointToRay(Input.mousePosition);            if (Physics.Raycast(ra, out hit))            {                                   }    }}

 

應用一：當滑鼠按住不動時，移動被選定物體隨滑鼠一起移動

using System.Collections;using System.Collections.Generic;using UnityEngine;public class camera : MonoBehaviour{    public Camera ca;    private Ray ra;    private RaycastHit hit;    // Use this for initialization    void Start()    {    }    // Update is called once per frame    void Update()    {        if (Input.GetMouseButton(0))        {            ra = ca.ScreenPointToRay(Input.mousePosition);            if (Physics.Raycast(ra, out hit))            {                hit.collider.gameObject.transform.position = ca.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, hit.collider.gameObject.transform.position.z));            }        }    }}

 

應用二：當滑鼠點擊物體時，物體隨滑鼠一起移動；當滑鼠再次點擊時，放下物體。

using System.Collections;using System.Collections.Generic;using UnityEngine;public class camera : MonoBehaviour {    public Camera ca;    private Ray ra;    private RaycastHit hit;    private int flag = 0;    // Use this for initialization    void Start () {            }        // Update is called once per frame    void Update () {        if (Input.GetMouseButtonDown(0))        {            ra = ca.ScreenPointToRay(Input.mousePosition);            if (Physics.Raycast(ra, out hit))            {               if (flag == 0)                {                    flag = 1;                } else                {                    flag = 0;                }            }        }        if (flag == 1)        {            hit.collider.gameObject.transform.position = ca.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, hit.collider.gameObject.transform.position.z));        }    }}

 出自http://blog.csdn.net/sysujackjiao/article/details/69396274

關於Unity3D中滑鼠移動指定物體的解決方案