将该脚本添加到相机上,可实现相机在场景中的自由移动,相机具有防穿墙功能(可选)。
输入控制:
使用 W
、S
、A
、D
、E
、Q
控制相机前后左右上下移动;
使用 鼠标右键
控制视角旋转。
参数控制:
变量 minDistance
设为小于等于 0
的值时相机能够穿透碰撞体表面(设为大于0的值时,相机到碰撞体前停住时的距离会略小于设定值)。
using UnityEngine;
public class TourCamera : MonoBehaviour
{
// 在场景中游览的相机(不要给相机加碰撞器!)
public Transform tourCamera;
#region 相机移动参数
public float moveSpeed = 1.0f;
public float rotateSpeed = 90.0f;
public float shiftRate = 2.0f;// 按住Shift加速
public float minDistance = 0.5f;// 相机离不可穿过的表面的最小距离(小于等于0时可穿透任何表面)
#endregion
#region 运动速度和其每个方向的速度分量
private Vector3 direction = Vector3.zero;
private Vector3 speedForward;
private Vector3 speedBack;
private Vector3 speedLeft;
private Vector3 speedRight;
private Vector3 speedUp;
private Vector3 speedDown;
#endregion
void Start()
{
if (tourCamera == null) tourCamera = gameObject.transform;
// 防止相机边缘穿透
//if (tourCamera.GetComponent<Camera>().nearClipPlane > minDistance / 3)
//{
// tourCamera.GetComponent<Camera>().nearClipPlane /= 3;
//}
}
void Update()
{
GetDirection();
// 检测是否离不可穿透表面过近
RaycastHit hit;
while (Physics.Raycast(tourCamera.position, direction, out hit, minDistance))
{
// 消去垂直于不可穿透表面的运动速度分量
float angel = Vector3.Angle(direction, hit.normal);
float magnitude = Vector3.Magnitude(direction) * Mathf.Cos(Mathf.Deg2Rad * (180 - angel));
direction += hit.normal * magnitude;
}
tourCamera.Translate(direction * moveSpeed * Time.deltaTime, Space.World);
}
private void GetDirection()
{
#region 加速移动
if (Input.GetKeyDown(KeyCode.LeftShift)) moveSpeed *= shiftRate;
if (Input.GetKeyUp(KeyCode.LeftShift)) moveSpeed /= shiftRate;
#endregion
#region 键盘移动
// 复位
speedForward = Vector3.zero;
speedBack = Vector3.zero;
speedLeft = Vector3.zero;
speedRight = Vector3.zero;
speedUp = Vector3.zero;
speedDown = Vector3.zero;
// 获取按键输入
if (Input.GetKey(KeyCode.W)) speedForward = tourCamera.forward;
if (Input.GetKey(KeyCode.S)) speedBack = -tourCamera.forward;
if (Input.GetKey(KeyCode.A)) speedLeft = -tourCamera.right;
if (Input.GetKey(KeyCode.D)) speedRight = tourCamera.right;
if (Input.GetKey(KeyCode.E)) speedUp = Vector3.up;
if (Input.GetKey(KeyCode.Q)) speedDown = Vector3.down;
direction = speedForward + speedBack + speedLeft + speedRight + speedUp + speedDown;
#endregion
#region 鼠标旋转
if (Input.GetMouseButton(1))
{
// 转相机朝向
tourCamera.RotateAround(tourCamera.position, Vector3.up, Input.GetAxis("Mouse X") * rotateSpeed * Time.deltaTime);
tourCamera.RotateAround(tourCamera.position, tourCamera.right, -Input.GetAxis("Mouse Y") * rotateSpeed * Time.deltaTime);
// 转运动速度方向
direction = V3RotateAround(direction, Vector3.up, Input.GetAxis("Mouse X") * rotateSpeed * Time.deltaTime);
direction = V3RotateAround(direction, tourCamera.right, -Input.GetAxis("Mouse Y") * rotateSpeed * Time.deltaTime);
}
#endregion
}
/// <summary>
/// 计算一个Vector3绕旋转中心旋转指定角度后所得到的向量。
/// </summary>
/// <param name="source">旋转前的源Vector3</param>
/// <param name="axis">旋转轴</param>
/// <param name="angle">旋转角度</param>
/// <returns>旋转后得到的新Vector3</returns>
public Vector3 V3RotateAround(Vector3 source, Vector3 axis, float angle)
{
Quaternion q = Quaternion.AngleAxis(angle, axis);// 旋转系数
return q * source;// 返回目标点
}
}