标签：观察 down ack osi csdn cal bsp == 坐标
一、鼠标拾取物体的原理
在Unity3D当中，想要在观察面(Aspect)中拾取物体(有碰撞属性)的方法一般如下：
1、声明一个观察的摄像机、一个从摄像机原点出发的射线Ray以及一个用于检测碰撞的RaycastHit；
2、将射线Ray定义为从摄像机原点出发并且指向当前鼠标所在的坐标(屏幕坐标)；
3、定义碰撞RaycastHit为射线Ray与有碰撞属性的物体的碰撞点。
具体代码实现如下(C#代码)：
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)) { } } }
应用一：当鼠标按住不动时，移动被选定物体随鼠标一起移动
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)); } } } }
应用二：当鼠标点击物体时，物体随鼠标一起移动；当鼠标再次点击时，放下物体。
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
标签：观察 down ack osi csdn cal bsp == 坐标
原文地址：http://www.cnblogs.com/HangZhe/p/7199182.html
