unity中Game视图中实现和Scene视图中一样的摄像机操作

代码运行，是可行的，在github上找的，侵权请告知，忘记在哪下的了。

using UnityEngine;
using System.Collections;public class CameraController : MonoBehaviour
{/// <summary>/// 视角类型./// </summary>private enum ViewType{_2D = 0,_3D}/// <summary>/// 鼠标按键./// </summary>private enum MouseButton{/// <summary>/// 鼠标左键./// </summary>LEFT = 0,/// <summary>/// 鼠标右键./// </summary> RIGHT,/// <summary>/// 鼠标中键./// </summary>MIDDLE}/// <summary>/// 指针样式./// </summary>private enum CursorType{/// <summary>/// 默认样式./// </summary>DEFAULT = 0,/// <summary>/// 小手./// </summary>HAND,/// <summary>/// 眼睛./// </summary>EYE,/// <summary>/// 放大镜./// </summary>MAGNIFIER}#region 字段private const string MOUSESCROLLWHEEL = "Mouse ScrollWheel";        // 鼠标滚轮.private const string MOUSEX = "Mouse X";private const string MOUSEY = "Mouse Y";#region 输入private bool leftAltKeyDown;                                        // 左Alt键-按下.private bool rightAltKeyDown;                                       // 右Alt键-按下.private bool leftAltKey;                                            // 左Alt键-长按.private bool rightAltKey;                                           // 右Alt键-长按.private bool leftAltKeyUp;                                          // 左Alt键-抬起.private bool rightAltKeyUp;                                         // 右Alt键-抬起.private bool leftMouseButtonDown;                                   // 鼠标左键-按下.private bool rightMouseButtonDown;                                  // 鼠标右键-按下.private bool leftMouseButton;                                       // 鼠标左键-长按.private bool rightMouseButton;                                      // 鼠标右键-长按.private bool rightMouseButtonUp;                                    // 鼠标右键-抬起.private bool middleMouseButton;                                     // 鼠标中键-长按.private bool middleMouseButtonUp;                                   // 鼠标中键-抬起.#endregionprivate Camera m_Camera;                                            // 相机.private Texture2D handCursorTexture;                                // 小手.private Texture2D eyeCursorTexture;                                 // 眼睛.private Texture2D magnifierCursorTexture;                           // 放大镜.private Vector2 hotSpot = Vector2.zero;private CursorMode cursorMode = CursorMode.Auto;private float angle_X;                                              // 水平方向的角度值，绕Transform的y轴旋转（左右）private float angle_Y;                                              // 竖直方向的角度值，绕Transform的x轴旋转（上下）private float angle_Z;// 切换视角private Matrix4x4 defaultOrthProjMat;                               // 相机默认的正交投影矩阵.private Matrix4x4 defaultPersProjMat;                               // 相机默认的透视投影矩阵.private Matrix4x4 currentProjMat;                                   // 相机当前的投影矩阵.private bool isChangingViewType = false;                            // 正在切换视角.private float viewTypeLerpTime = 0f;                                // 插值时间.private ViewType viewType;                                          // 当前视角.[Header("Zoom")]// 相机拉近拉远 Zoom[SerializeField]private float distance = 20f;                      // 相机与lookAroudPos点的距离.[SerializeField, Range(1f, 20f)]private float zoomSpeed = 10f;                                      // 滚轮缩放速度.[SerializeField]private float maxDistance = 100f;                  // 相机最远距离.[SerializeField]private float minDistance = 1f;                    // 相机最近距离.[Header("360° Rotate")]// Alt+鼠标拖动, 360度观察[SerializeField, Range(2f, 10f)]private float rotateSensitivity = 5f;                               // 旋转灵敏度.private Vector3 lookAroundPos = Vector3.zero;// Alt+鼠标右键 放大缩小[Header("Field Of View")]private float minFov = 20f;                                         // 最小视角.private float maxFov = 135f;                                        // 最大视角.private Vector3 lastMousePosFov = Vector3.zero;[SerializeField, Range(0.01f, 0.1f)]private float fovSensitivity = 0.05f;                               // 视角灵敏度.// 选中物体聚焦private GameObject selectedObj = null;                              // 选中的物体.private float raycastMaxDistance = 1000f;private LayerMask raycastLayerMask;private RaycastHit raycastHit;[Header("Focus")][SerializeField, Range(0.1f, 5f)]private float focusSpeed = 3.0f;                                    // 聚焦的速度.[SerializeField]private float focusDistance = 3f;                                   // 聚焦时与物体的距离.private bool isFocusing = false;                                    // 相机正看向物体中.private float focusTime = 0f;                                       // 聚焦时间.private Vector3 cameraInitForward;                                  // 相机最初的前方.private Vector3 focusTargetForward;                                 // 聚焦目标前方.private Vector3 focusInitPos;                                       // 聚焦前相机初始位置.private Vector3 focusTargetPos;                                     // 聚焦目标位置.#endregion#region Unity_Methodprivate void Start(){Init();}private float mMoveSpeed = 0.2f;private void LateUpdate(){// 更新输入.UpdateInput();// 切换视角.SwitchViewType();// 拉近拉远.Zoom();// 拖动相机.Drag();// 360°查看.LookAround();// 放大缩小. 和切换视角共同使用时有Bug.Magnifier();// 聚焦.Focus();if (Input.GetKey(KeyCode.W)){m_Camera.transform.position += m_Camera.transform.forward * mMoveSpeed;}else if (Input.GetKey(KeyCode.S)){m_Camera.transform.position += -m_Camera.transform.forward * mMoveSpeed;}else if (Input.GetKey(KeyCode.A)){m_Camera.transform.position += -m_Camera.transform.right * mMoveSpeed;}else if (Input.GetKey(KeyCode.D)){m_Camera.transform.position += m_Camera.transform.right * mMoveSpeed;}}private void OnGUI(){//if (GUI.Button(new Rect(Vector2.zero, new Vector2(100, 50)), "正交"))//{//    SetViewType(ViewType._2D);//}//if (GUI.Button(new Rect(Vector2.up * 60, new Vector2(100, 50)), "透视"))//{//    SetViewType(ViewType._3D);//}//if (GUI.Button(new Rect(Vector2.up * 120, new Vector2(100, 50)), "正视图"))//{//    Front();//}//if (GUI.Button(new Rect(Vector2.up * 180, new Vector2(100, 50)), "后视图"))//{//    Back();//}//if (GUI.Button(new Rect(Vector2.up * 240, new Vector2(100, 50)), "左视图"))//{//    Left();//}//if (GUI.Button(new Rect(Vector2.up * 300, new Vector2(100, 50)), "右视图"))//{//    Right();//}//if (GUI.Button(new Rect(Vector2.up * 360, new Vector2(100, 50)), "上视图"))//{//    Top();//}//if (GUI.Button(new Rect(Vector2.up * 420, new Vector2(100, 50)), "下视图"))//{//    Down();//}}#endregion#region 初始化相关/// <summary>/// 初始化./// </summary>private void Init(){m_Camera = GetComponent<Camera>();raycastLayerMask = 1 << LayerMask.NameToLayer("Default");RecalcDistance();CalculateProjMatrix();                  // 获取相机默认矩阵.ResetLookAroundPos();                   // 重置观察中心.LoadCursorTexture();                    // 加载鼠标图标.}/// <summary>/// 重置观察中心(观察中心在相机的前方)./// </summary>private void ResetLookAroundPos(){lookAroundPos = m_Camera.transform.position + m_Camera.transform.rotation * (Vector3.forward * distance);}/// <summary>/// 加载鼠标指针图标./// </summary>private void LoadCursorTexture(){handCursorTexture = Resources.Load<Texture2D>("Textures/Hand");eyeCursorTexture = Resources.Load<Texture2D>("Textures/Eye");magnifierCursorTexture = Resources.Load<Texture2D>("Textures/Magnifier");}/// <summary>/// 设置鼠标样式./// </summary>private void SetCursor(CursorType cursorType){switch (cursorType){case CursorType.DEFAULT:Cursor.SetCursor(null, hotSpot, cursorMode);break;case CursorType.HAND:Cursor.SetCursor(handCursorTexture, hotSpot, cursorMode);break;case CursorType.EYE:Cursor.SetCursor(eyeCursorTexture, hotSpot, cursorMode);break;case CursorType.MAGNIFIER:Cursor.SetCursor(magnifierCursorTexture, hotSpot, cursorMode);break;default:Debug.LogError("未知指针类型.");break;}}/// <summary>/// 更新输入./// </summary>private void UpdateInput(){leftAltKeyDown = Input.GetKeyDown(KeyCode.LeftAlt);                            // 左Alt键-按下.rightAltKeyDown = Input.GetKeyDown(KeyCode.RightAlt);                          // 右Alt键-按下.leftAltKey = Input.GetKey(KeyCode.LeftAlt);                                    // 左Alt键-长按.rightAltKey = Input.GetKey(KeyCode.RightAlt);                                  // 右Alt键-长按.leftAltKeyUp = Input.GetKeyUp(KeyCode.LeftAlt);                                // 左Alt键-抬起.rightAltKeyUp = Input.GetKeyUp(KeyCode.RightAlt);                              // 右Alt键-抬起.rightMouseButtonDown = Input.GetMouseButtonDown((int)MouseButton.RIGHT);       // 鼠标右键-按下.leftMouseButtonDown = Input.GetMouseButtonDown((int)MouseButton.LEFT);         // 鼠标左键-按下.leftMouseButton = Input.GetMouseButton((int)MouseButton.LEFT);                 // 鼠标左键-长按.rightMouseButton = Input.GetMouseButton((int)MouseButton.RIGHT);               // 鼠标右键-长按.rightMouseButtonUp = Input.GetMouseButtonUp((int)MouseButton.RIGHT);           // 鼠标右键-抬起.middleMouseButton = Input.GetMouseButton((int)MouseButton.MIDDLE);             // 鼠标中键-按下.  middleMouseButtonUp = Input.GetMouseButtonUp((int)MouseButton.MIDDLE);         // 鼠标中键-抬起.}/// <summary>/// 计算距离./// </summary>private void RecalcDistance(){Vector3 checkFarPos = m_Camera.transform.position + m_Camera.transform.rotation * (Vector3.forward * 1000);if (Physics.Linecast(m_Camera.transform.position, checkFarPos, out raycastHit)){// 如果相机中心有物体，则以物体到相机为距离distance = raycastHit.distance;if (selectedObj == null){selectedObj = raycastHit.collider.gameObject;}}}#endregion#region 切换视角/// <summary>/// 计算投影矩阵./// </summary>private void CalculateProjMatrix(){currentProjMat = m_Camera.projectionMatrix;float aspect = m_Camera.aspect;float fov = m_Camera.fieldOfView;float size = m_Camera.orthographicSize;float far = m_Camera.farClipPlane;float near = m_Camera.nearClipPlane;float tan = Mathf.Tan(Mathf.Deg2Rad * fov * 0.5f);if (m_Camera.orthographic){// 启动时相机是正交的viewType = ViewType._2D;fov = SetFovBySize(size);}else{// 启动时相机是透视的viewType = ViewType._3D;size = SetSizeByFov(fov);}// 透视投影矩阵.defaultPersProjMat = new Matrix4x4();//defaultPersProjMat = Matrix4x4.Perspective(fov, aspect, near, far);           // 透视矩阵也可直接调用这个来计算.defaultPersProjMat.SetRow(0, new Vector4(1.0f / (tan * aspect), 0, 0, 0));defaultPersProjMat.SetRow(1, new Vector4(0, 1.0f / tan, 0, 0));defaultPersProjMat.SetRow(2, new Vector4(0, 0, -(far + near) / (far - near), -2 * far * near / (far - near)));defaultPersProjMat.SetRow(3, new Vector4(0, 0, -1, 0));// 正交投影矩阵.defaultOrthProjMat = new Matrix4x4();defaultOrthProjMat.SetRow(0, new Vector4(1.0f / (aspect * size), 0, 0, 0));defaultOrthProjMat.SetRow(1, new Vector4(0, 1.0f / size, 0, 0));defaultOrthProjMat.SetRow(2, new Vector4(0, 0, -2f / (far - near), -(far + near) / (far - near)));defaultOrthProjMat.SetRow(3, new Vector4(0, 0, 0, 1));}/// <summary>/// 切换视角./// </summary>private void SwitchViewType(){if (isChangingViewType){viewTypeLerpTime += Time.deltaTime * 2.0f;if (viewType == ViewType._2D){// 切换到正交视图.currentProjMat = Utils.Math.MatrixLerp(currentProjMat, defaultOrthProjMat, viewTypeLerpTime);}else{// 切换到透视视图.currentProjMat = Utils.Math.MatrixLerp(currentProjMat, defaultPersProjMat, viewTypeLerpTime);}m_Camera.projectionMatrix = currentProjMat;if (viewTypeLerpTime >= 1.0f){isChangingViewType = false;viewTypeLerpTime = 0f;if (viewType == ViewType._2D){m_Camera.orthographic = true;}else{m_Camera.orthographic = false;}m_Camera.ResetProjectionMatrix();}}}/// <summary>/// 设置将要切换的视角./// </summary>/// <param name="targetViewType">目标视角.</param>private void SetViewType(ViewType targetViewType){if (viewType != targetViewType){viewType = targetViewType;isChangingViewType = true;viewTypeLerpTime = 0f;}}/// <summary>/// 根据正交相机的size设置对应透视相机的fov/// </summary>/// <param name="size">正交相机高度的一半，即orthographicSize</param>private float SetFovBySize(float size){float fov = 2.0f * Mathf.Atan(size / distance) * Mathf.Rad2Deg;m_Camera.fieldOfView = fov;return fov;}/// <summary>/// 根据透视相机的fov设置对应正交相机的即orthographicSize/// </summary>/// <param name="fov">透视相机的fov</param>private float SetSizeByFov(float fov){float size = distance * Mathf.Tan(fov * 0.5f * Mathf.Deg2Rad);m_Camera.orthographicSize = size;return size;}#endregion#region 拉近拉远/// <summary>/// 拉近拉远./// </summary>/// <remarks>鼠标滚轮滚动，向上滚动拉近相机，向下滚动拉远相机</remarks>private void Zoom(){float scrollWheelValue = Input.GetAxis(MOUSESCROLLWHEEL);if (!Utils.Math.IsEqual(scrollWheelValue, 0f)){// scrollWheelValue：滚轮向上为+ 向下为-// 同时滚轮向上，拉近相机；滚轮向下，拉远相机distance -= scrollWheelValue * zoomSpeed;distance = Mathf.Clamp(distance, minDistance, maxDistance);m_Camera.transform.position = lookAroundPos - m_Camera.transform.rotation * (Vector3.forward * distance);// 相机距离改变后需同时修改fov或orthographicSize以及投影矩阵，保证正交/透视视图切换效果CalculateProjMatrix();}}#endregion#region 拖动private bool isDraging = false;private Vector3 lastMousePos;/// <summary>/// 拖动./// </summary>/// <remark>长按鼠标中键拖动</remark>private void Drag(){// 鼠标中键拖动相机.if (middleMouseButton){if (isDraging == false){isDraging = true;// 设置小手指针.SetCursor(CursorType.HAND);lastMousePos = Input.mousePosition;}else{Vector3 newMousePos = Input.mousePosition;Vector3 delta = newMousePos - lastMousePos;m_Camera.transform.position += CalcDragLength(m_Camera, delta, distance);lastMousePos = newMousePos;// 相机移动，重新设置目标位置.ResetLookAroundPos();}}if (middleMouseButtonUp){isDraging = false;// 恢复默认指针.SetCursor(CursorType.DEFAULT);}}/// <summary>/// 计算拖拽距离./// </summary>/// <param name="camera">相机</param>/// <param name="mouseDelta">鼠标移动距离</param>/// <param name="distance">相机距离观察物体的距离</param>private Vector3 CalcDragLength(Camera camera, Vector2 mouseDelta, float distance){float rectHeight = -1;float rectWidth = -1;if (camera.orthographic){rectHeight = 2 * camera.orthographicSize;//rectWidth = rectHeight / camera.aspect;}else{rectHeight = 2 * distance * Mathf.Tan(camera.fieldOfView * 0.5f * Mathf.Deg2Rad);}rectWidth = Screen.width * rectHeight / Screen.height;Vector3 moveDir = -rectWidth / Screen.width * mouseDelta.x * camera.transform.right - rectHeight / Screen.height * mouseDelta.y * camera.transform.up;return moveDir;}#endregion#region 360°旋转观察/// <summary>/// 360°旋转查看./// </summary>/// <remark>Alt+鼠标左键 或 鼠标右键</remark>private void LookAround(){if (leftAltKeyDown || rightAltKeyDown || rightMouseButtonDown){SetCursor(CursorType.EYE);angle_X = m_Camera.transform.eulerAngles.y;angle_Y = m_Camera.transform.eulerAngles.x;angle_Z = m_Camera.transform.eulerAngles.z;}if ((leftAltKey && leftMouseButton)|| (rightAltKey && leftMouseButton)|| (!leftAltKey && !rightAltKey && rightMouseButton)){float deltaX = Input.GetAxis(MOUSEX);float deltaY = Input.GetAxis(MOUSEY);// 相机朝前和朝后,与鼠标的滑动方向相反if ((angle_Y > 90f && angle_Y < 270f) || (angle_Y < -90 && angle_Y > -270f)){angle_X -= deltaX * rotateSensitivity;}else{angle_X += deltaX * rotateSensitivity;}angle_Y -= deltaY * rotateSensitivity;angle_X = Utils.Math.ClampAngle(angle_X, -365, 365);angle_Y = Utils.Math.ClampAngle(angle_Y, -365, 365);SetCameraPos();}if (leftAltKeyUp || rightAltKeyUp || rightMouseButtonUp){SetCursor(CursorType.DEFAULT);}}private void SetCameraPos(){Quaternion rotation = Quaternion.Euler(angle_Y, angle_X, angle_Z);Vector3 dir = Vector3.forward * -distance;m_Camera.transform.rotation = rotation;m_Camera.transform.position = lookAroundPos + rotation * dir;}#endregion#region 聚焦选中物体/// <summary>/// 聚焦选中物体./// </summary>private void Focus(){if (leftMouseButtonDown){Ray ray = m_Camera.ScreenPointToRay(Input.mousePosition);// Scene视图绘制射线方便测试.//Debug.DrawLine(ray.origin, ray.origin + ray.direction * raycastMaxDistance, Color.red, 3f);if (Physics.Raycast(ray, out raycastHit, raycastMaxDistance, raycastLayerMask)){selectedObj = raycastHit.collider.gameObject;}else{selectedObj = null;ResetLookAroundPos();}}if (selectedObj != null){if (Input.GetKeyDown(KeyCode.F)){isFocusing = true;focusTime = 0f;cameraInitForward = m_Camera.transform.forward;focusTargetForward = Vector3.Normalize(selectedObj.transform.position - m_Camera.transform.position);focusInitPos = m_Camera.transform.position;distance = focusDistance;focusTargetPos = selectedObj.transform.position - focusTargetForward * distance;}}if (isFocusing){focusTime += Time.deltaTime * focusSpeed;Vector3 forward = Vector3.Lerp(cameraInitForward, focusTargetForward, focusTime);m_Camera.transform.rotation = Quaternion.LookRotation(forward);m_Camera.transform.position = Vector3.Lerp(focusInitPos, focusTargetPos, focusTime);if (focusTime >= 1f){// 聚焦完毕.focusTime = 0f;isFocusing = false;m_Camera.transform.rotation = Quaternion.LookRotation(focusTargetForward);m_Camera.transform.position = focusTargetPos;// 设置观察中心.lookAroundPos = selectedObj.transform.position;}}}#endregion#region 各种视图/// <summary>/// 正视图./// </summary>private void Front(){angle_X = 180;angle_Y = 0;SetCameraPos();}/// <summary>/// 后视图./// </summary>private void Back(){angle_X = 0;angle_Y = 0;SetCameraPos();}/// <summary>/// 右视图./// </summary>private void Right(){angle_X = -90;angle_Y = 0;SetCameraPos();}/// <summary>/// 左视图./// </summary>private void Left(){angle_X = 90;angle_Y = 0;SetCameraPos();}/// <summary>/// 上视图(俯视图)./// </summary>private void Top(){angle_X = 0;angle_Y = 90;SetCameraPos();}/// <summary>/// 下视图./// </summary>private void Down(){angle_X = 0;angle_Y = -90;SetCameraPos();}#endregion#region 放大/缩小/// <summary>/// 放大缩小./// </summary>private void Magnifier(){if ((leftAltKey || rightAltKey) && rightMouseButton){if (lastMousePosFov.Equals(Vector3.zero)){lastMousePosFov = Input.mousePosition;SetCursor(CursorType.MAGNIFIER);}float deltaX = lastMousePosFov.x - Input.mousePosition.x;if (viewType == ViewType._2D){// 透视视图改sizefloat size = m_Camera.orthographicSize + deltaX * 0.01f;size = Mathf.Clamp(size, 1.0f, 8f);m_Camera.orthographicSize = size;// 调节size需同时修改相机透视模式下的fovSetFovBySize(size);}else{// 透视视图改fovfloat fov = m_Camera.fieldOfView + deltaX * fovSensitivity;fov = Mathf.Clamp(fov, minFov, maxFov);m_Camera.fieldOfView = fov;// 调节了fov需同时修改相机正交模式下的sizeSetSizeByFov(fov);}lastMousePosFov = Input.mousePosition;}if (rightMouseButtonUp){SetCursor(CursorType.DEFAULT);lastMousePosFov = Vector3.zero;// 重新计算投影矩阵.CalculateProjMatrix();}}#endregion
}

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