1.场景搭建
主要包含相机、地形、代表玩家的方块，相机需要跟随该方块。
由于需要接收触屏事件，因此需要设置模拟器
将代表玩家的方块的Tag设置为Player，用于之后相机碰撞检测过滤。
2.编写脚本
新建脚本，命名为TPSCamera
首先编写常用的属性，将其挂载到Main Camera上。
将Cube绑定到followTarget上，Main Camera绑定到controlCamera上
public class TPSCamera : MonoBehaviour{public Transform followTarget = null; // 相机拍摄的物体public Vector2 rotate; // 相机的转动角度（绕着x轴和y轴）public float rotateSpeed = 0.6f; // 相机的转向速度public float moveSpeed = 10; // 相机的移动速度public float maxY = 80; // 相机向下移动的最大角度public float minY = -80; // 相机向下移动的最小角度public float viewSize = 60; // 相机的视野public float defaultAngle = -135; // 默认角度public float radius = 5; // 相机与目标物体的距离public float height = 0.8f; // 焦点与目标物体的高度差private Camera controlCamara; // 目标相机void Start(){controlCamara = this.GetComponent<Camera>();Input.multiTouchEnabled = true;}}
实现触屏移动视角的代码，这里我们找到接触到右半边屏幕的手指，并记录它的位置。
private int lastfingerId = -1;void FixedUpdate(){for (int i = 0; i < Input.touchCount; i++){Touch touch = Input.GetTouch(i);// 找到接触到右半边的手指if (touch.position.x < UnityEngine.Screen.width / 2)continue;if (lastfingerId != touch.fingerId && lastfingerId != -1)continue;switch (touch.phase){case TouchPhase.Began:lastfingerId = touch.fingerId;break;case TouchPhase.Moved:rotate.x += touch.deltaPosition.x * rotateSpeed;rotate.y += touch.deltaPosition.y * rotateSpeed;if (rotate.y < -60){rotate.y = -60;}else if (rotate.y > 45){rotate.y = 45;}break;case TouchPhase.Ended:lastfingerId = -1;break;}break;}}
同步相机位置并实现相机的碰撞检测
void LateUpdate(){if (followTarget == null) return;Transform self = controlCamera.transform;Vector3 startPosition = self.position;Vector3 endPosition;Vector3 targetPos = followTarget.position;targetPos.y += height;Vector2 v1 = CalcAbsolutePoint(rotate.x, radius);endPosition = targetPos + new Vector3(v1.x, 0, v1.y);Vector2 v2 = CalcAbsolutePoint(rotate.x + defaultAngle, 1);Vector3 viewPoint = new Vector3(v2.x, 0, v2.y) + targetPos;float dist = Vector3.Distance(endPosition, viewPoint);Vector2 v3 = CalcAbsolutePoint(rotate.y, dist);endPosition += new Vector3(0, v3.y, 0);RaycastHit hit;if (Physics.Linecast(targetPos, endPosition, out hit)){string name = hit.collider.gameObject.tag;// 将玩家的Tag设置为Playerif (!(name == "MainCamera" || name.StartsWith("Player"))){endPosition = hit.point - (endPosition - hit.point).normalized * 0.2f;}}self.position = Vector3.Lerp(startPosition, endPosition, Time.deltaTime * moveSpeed);Quaternion rotateQ = Quaternion.LookRotation(viewPoint - endPosition);self.rotation = Quaternion.Slerp(transform.rotation, rotateQ, Time.deltaTime * moveSpeed);}public static Vector2 CalcAbsolutePoint(float angle, float dist){float radian = -angle * (Mathf.PI / 180);float x = dist * Mathf.Cos(radian);float y = dist * Mathf.Sin(radian);return new Vector2(x, y);}
