物体移出镜头外出现ui提示

ps：刚好项目要实现这个功能，翻了翻网上没有找到相关文章，自己就写了一个，有什么更好的建议还请多指教

实现思路：

1、检测物体是否移出屏幕外

这部分unity有现成API，OnBecameVisible，与OnBecameInvisible. 这两个函数可以检测，但脚本要挂在检测的物体上，物体要有render组件

2、确定ui边缘位置

物体世界坐标转为屏幕左边，计算屏幕中心点与物体屏幕坐标连线，与屏幕边缘相交的点.

3、判断与屏幕相交的线是哪一条

使用矩阵给目标物体建立新的坐标

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class BeameF : MonoBehaviour
{//参照的摄像机GameObject m_camera;//目标名称string m_objName;//提示按钮是否出现bool m_isButtonDis = false;//提示按钮public GameObject m_Button0;//提示ui状态public enum Disstate{Left,Right,Up,Down}Disstate m_dis;void Start(){m_camera = GameObject.FindGameObjectWithTag("MainCamera");}void OnBecameVisible(){//提示按钮没有出现m_isButtonDis = false;Debug.Log(this.name + "+" + "Visible");//关闭按钮提示m_objName = this.name;InterativeButtonCueClose(m_objName);}void OnBecameInvisible(){Debug.Log(this.name + "+" + "Invisible");//目标坐标转屏幕坐标Vector2 objScreen = Camera.main.WorldToScreenPoint(this.transform.position);//屏幕中心点与屏幕边缘的交点Vector3 point = Point(objScreen);//摄像机位置下目标位置Vector3 m_targetV3 = CalUVByMatrix(MakeMatrix(this.transform.position, m_camera.transform.forward, m_camera.transform.up, m_camera.transform.right), m_camera.transform.position);//打开按钮提示m_objName = this.name;InterativeButtonCue(m_objName, m_targetV3, point);//提示按钮出现m_isButtonDis = true;}void Update(){if (m_isButtonDis){StartCoroutine(Detection());}else{//关闭按钮提示m_objName = this.name;InterativeButtonCueClose(m_objName);}}//协程减少检测频率IEnumerator Detection(){yield return new WaitForSeconds(0.5f);//目标坐标转屏幕坐标Vector2 objScreen = Camera.main.WorldToScreenPoint(this.transform.position);//屏幕中心点与屏幕边缘的交点Vector3 point = Point(objScreen);//摄像机位置下目标位置Vector3 m_targetV3 = CalUVByMatrix(MakeMatrix(this.transform.position, m_camera.transform.forward, m_camera.transform.up, m_camera.transform.right), m_camera.transform.position);//打开按钮提示m_objName = this.name;InterativeButtonCue(m_objName, m_targetV3, point);}/// <summary>/// 构建一个4x4的矩阵/// </summary>/// <param name="origin">新坐标空间的原点位置</param>/// <param name="forward">新坐标空间的Z轴</param>/// <param name="up">新坐标空间的Y轴</param>/// <param name="right">新坐标空间的X轴</param>private Matrix4x4 MakeMatrix(Vector3 origin, Vector3 forward, Vector3 up, Vector3 right){Matrix4x4 matrix = new Matrix4x4();Vector4 n_origin = new Vector4(origin.x, origin.y, origin.z, 1);Vector4 n_Z = new Vector4(forward.x, forward.y, forward.z, 0);Vector4 n_Y = new Vector4(up.x, up.y, up.z, 0);Vector4 n_X = new Vector4(right.x, right.y, right.z, 0);matrix.SetColumn(0, n_X);matrix.SetColumn(1, n_Y);matrix.SetColumn(2, n_Z);matrix.SetColumn(3, n_origin);return matrix;}/// <summary>/// 通过矩阵来建立新的坐标空间，来获取点的偏移/// </summary>/// <param name="matrix">坐标空间转换矩阵</param>/// <param name="target">需要转换的目标点</param>/// <returns></returns>private Vector3 CalUVByMatrix(Matrix4x4 matrix, Vector3 target){Vector4 pos = new Vector4(target.x, target.y, target.z, 1);matrix = matrix.inverse;Vector3 newPos = matrix * pos;return newPos;}/// <summary>/// 计算与屏幕交点/// </summary>/// <param name="_v2"></param>/// <returns></returns>Vector3 Point(Vector2 _v2){//判断物体与屏幕哪一边相交if (Mathf.Abs((_v2.x - (Screen.width / 2)) / (_v2.y - (Screen.height / 2))) > Mathf.Abs((Screen.width / 2) / (Screen.height / 2))){//与屏幕y轴相交//Debug.Log(Mathf.Abs(_v2.x / _v2.y) + "+" + Mathf.Abs((Screen.width / 2) / (Screen.height / 2)) + "+" + "y");Vector3 point;//计算边缘交点（交点z轴代表y轴）GetIntersection(new Vector3(Screen.width / 2, 0, Screen.height / 2), new Vector3(_v2.x, 0, _v2.y), new Vector3(Screen.width, 0, 0), new Vector3(Screen.width, 0, Screen.height), out point);return point;}else{//Debug.Log(Mathf.Abs(_v2.x / _v2.y) + "+" + Mathf.Abs((Screen.width / 2) / (Screen.height / 2)) + "+" + "x");//与屏幕x轴相交Vector3 point;//计算边缘交点（交点z轴代表y轴）GetIntersection(new Vector3(Screen.width / 2, 0, Screen.height / 2), new Vector3(_v2.x, 0, _v2.y), new Vector3(0, 0, Screen.height), new Vector3(Screen.width, 0, Screen.height), out point);return point;}return new Vector3(0, 0, 0);}/// <summary>/// 判断相交/// </summary>/// <param name="oneA"></param>/// <param name="oneB"></param>/// <returns></returns>public static int GetIntersection(Vector3 oneA, Vector3 oneB, Vector3 twoC, Vector3 twoD, out Vector3 contractPoint){//将4个端点置于同一水平面oneA.y = 0;oneB.y = 0;twoC.y = 0;twoD.y = 0;contractPoint = new Vector3(0, 0, 0);if (Mathf.Abs(oneB.z - oneA.z) + Mathf.Abs(oneB.x - oneA.x) + Mathf.Abs(twoD.z - twoC.z)+ Mathf.Abs(twoD.x - twoC.x) == 0){if ((twoC.x - oneA.x) + (twoC.z - oneA.z) == 0){Debug.Log("ABCD是同一个点！");}else{//Debug.Log("AB是一个点，CD是一个点，且AC不同！");}return 0;}if (Mathf.Abs(oneB.z - oneA.z) + Mathf.Abs(oneB.x - oneA.x) == 0){if ((oneA.x - twoD.x) * (twoC.z - twoD.z) - (oneA.z - twoD.z) * (twoC.x - twoD.x) == 0){//Debug.Log("A、B是一个点，且在CD线段上！");}else{//Debug.Log("A、B是一个点，且不在CD线段上！");}return 0;}if (Mathf.Abs(twoD.z - twoC.z) + Mathf.Abs(twoD.x - twoC.x) == 0){if ((twoD.x - oneB.x) * (oneA.z - oneB.z) - (twoD.z - oneB.z) * (oneA.x - oneB.x) == 0){//Debug.Log("C、D是一个点，且在AB线段上！");}else{//Debug.Log("C、D是一个点，且不在AB线段上！");}return 0;}if ((oneB.z - oneA.z) * (twoC.x - twoD.x) - (oneB.x - oneA.x) * (twoC.z - twoD.z) == 0){//Debug.Log("线段平行，无交点！");return 0;}if (oneA == twoC || oneA == twoD || oneB == twoC || oneB == twoD){//Debug.Log("两条线段有一个端点重合");return 0;}contractPoint.x = ((oneB.x - oneA.x) * (twoC.x - twoD.x) * (twoC.z - oneA.z) -twoC.x * (oneB.x - oneA.x) * (twoC.z - twoD.z) + oneA.x * (oneB.z - oneA.z) * (twoC.x - twoD.x)) /((oneB.z - oneA.z) * (twoC.x - twoD.x) - (oneB.x - oneA.x) * (twoC.z - twoD.z));contractPoint.z = ((oneB.z - oneA.z) * (twoC.z - twoD.z) * (twoC.x - oneA.x) - twoC.z* (oneB.z - oneA.z) * (twoC.x - twoD.x) + oneA.z * (oneB.x - oneA.x) * (twoC.z - twoD.z))/ ((oneB.x - oneA.x) * (twoC.z - twoD.z) - (oneB.z - oneA.z) * (twoC.x - twoD.x));if ((contractPoint.x - oneA.x) * (contractPoint.x - oneB.x) <= 0&& (contractPoint.x - twoC.x) * (contractPoint.x - twoD.x) <= 0&& (contractPoint.z - oneA.z) * (contractPoint.z - oneB.z) <= 0&& (contractPoint.z - twoC.z) * (contractPoint.z - twoD.z) <= 0){//Debug.Log("线段相交于点(" + contractPoint.x + "," + contractPoint.z + ")！");return 1; // '相交  }else{//Debug.Log("线段相交于虚交点(" + contractPoint.x + "," + contractPoint.z + ")！");return -1; // '相交但不在线段上  }}//提示ui显示public void InterativeButtonCue(string _name, Vector3 _targetV3, Vector3 _point){//ui状态if (Mathf.Abs(_targetV3.x) > Mathf.Abs(_targetV3.y)){if (_targetV3.x >= 0)m_dis = Disstate.Left;elsem_dis = Disstate.Right;}else{if (_targetV3.y >= 0)m_dis = Disstate.Up;elsem_dis =Disstate.Down;}CueFun(m_Button0, _point);m_Button0.SetActive(true);}//提示ui关闭public void InterativeButtonCueClose(string _name){m_Button0.SetActive(false);}//ui显示方法void CueFun(GameObject _button, Vector3 _point){//计算UI位置int m_py = (Screen.height / 2);int m_px = (Screen.width / 2);int m_uiSize = (int)_button.GetComponent<RectTransform>().rect.width / 2;//更改ui位置if (m_dis == Disstate.Left)_button.GetComponent<RectTransform>().localPosition = new Vector3(-_point.x / 2 + m_uiSize, -(_point.z - m_py), 0);else if (m_dis == Disstate.Right)_button.GetComponent<RectTransform>().localPosition = new Vector3(_point.x / 2 - m_uiSize, (_point.z - m_py), 0);else if (m_dis == Disstate.Up)_button.GetComponent<RectTransform>().localPosition = new Vector3(-(_point.x - m_px), -_point.z / 2 + m_uiSize, 0);else if (m_dis == Disstate.Down)_button.GetComponent<RectTransform>().localPosition = new Vector3(_point.x - m_px, _point.z / 2 - m_uiSize, 0);}}

注意：unity编辑下Scene窗口和Game窗口物体移出视口检测才有用.此脚本为了方便将所有内容整合在了一起

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物体移出镜头外出现ui提示

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