using System.Collections;using System.Collections.Generic;using UnityEngine;public class viewchange : MonoBehaviour {public static viewchange Instance=null;/// <summary>/// 相机透视改变是否触发(调用只需把此值改为true)/// </summary>public bool ChangeProjection = false;private bool _changing = false;public float ProjectionChangeTime = 0.5f;private float _currentT = 0.0f;void Awake(){Instance=this;}private void Update () {///检测，避免变换过程中发生混乱if (_changing) {ChangeProjection = false;} else if (ChangeProjection) {_changing = true;_currentT = 0.0f;}}/// <summary>/// Unity3D中Update和Lateupdate的区别。Lateupdate和Update每一祯都被执行，但是执行顺序不一样，先执行Updatee然后执行lateUpdate。///如果你有两个脚本JS1、JS2，两个脚本中都有Update()函数, 在JS1中有 lateUpdate ,JS2中没有。那么 lateUpdate 函数会等待JS1、JS2两个脚本的Update()函数 都执行完后才执行。/// </summary>private void LateUpdate () {if (!_changing) {return;}//将当前的 是否正视图值 赋值给currentlyOrthographic变量bool currentlyOrthographic = Camera.main.orthographic;//定义变量存放当前摄像机的透视和正视矩阵信息；Matrix4x4 orthoMat, persMat;if (currentlyOrthographic) //如果当前摄像机为正视状态{orthoMat = Camera.main.projectionMatrix;Camera.main.orthographic = false;Camera.main.ResetProjectionMatrix ();persMat = Camera.main.projectionMatrix;} else //否则当前摄像机为透视状态{persMat = Camera.main.projectionMatrix;Camera.main.orthographic = true;Camera.main.ResetProjectionMatrix ();orthoMat = Camera.main.projectionMatrix;}Camera.main.orthographic = currentlyOrthographic;_currentT += (Time.deltaTime / ProjectionChangeTime);if (_currentT < 1.0f) {if (currentlyOrthographic) {Camera.main.projectionMatrix = MatrixLerp (orthoMat, persMat, _currentT * _currentT);} else {Camera.main.projectionMatrix = MatrixLerp (persMat, orthoMat, Mathf.Sqrt (_currentT));}} else {_changing = false;Camera.main.orthographic = !currentlyOrthographic;Camera.main.ResetProjectionMatrix ();}}private Matrix4x4 MatrixLerp (Matrix4x4 from, Matrix4x4 to, float t) {t = Mathf.Clamp (t, 0.0f, 1.0f);Matrix4x4 newMatrix = new Matrix4x4 ();newMatrix.SetRow (0, Vector4.Lerp (from.GetRow (0), to.GetRow (0), t));newMatrix.SetRow (1, Vector4.Lerp (from.GetRow (1), to.GetRow (1), t));newMatrix.SetRow (2, Vector4.Lerp (from.GetRow (2), to.GetRow (2), t));newMatrix.SetRow (3, Vector4.Lerp (from.GetRow (3), to.GetRow (3), t));return newMatrix;}void OnGUI () {// GUILayout.Label ("New Camera.main.projectionMatrix:\n" + Camera.main.projectionMatrix.ToString ());// if (GUILayout.Button ("更改CameraProjection")) {// ChangeProjection = true;// }}}
