Unity实现第三人称角色控制

摄像机的控制：（挂载在摄像机的第一个父物体上）

public class CameraCtrl : MonoBehaviour

{

    public GameObject rotateY;

    public GameObject rotateX;

    private Quaternion targetTransY;

    private Quaternion targetTransX;

    private float mouseY;

    private float mouseX;

    private float YAngleChange;

    private float XAngleChange;

    private float smoothSpeed = 10f;

    void LateUpdate()

    {

        //if (Input.GetMouseButton(0))

        //{

        mouseX = Input.GetAxis("Mouse X");

        mouseY = Input.GetAxis("Mouse Y");

        RotateByX(mouseY);

        RotateByY(mouseX);

        //}

    }

    void RotateByY(float xValue)

    {

        YAngleChange += xValue * smoothSpeed * Time.deltaTime * 90;

        targetTransY = Quaternion.Euler(0, YAngleChange, 0);

        rotateY.transform.localRotation = Quaternion.Slerp(rotateY.transform.localRotation, targetTransY, 2);

    }

    void RotateByX(float yValue)

    {

        XAngleChange -= yValue * smoothSpeed * Time.deltaTime * 90;

        XAngleChange = Mathf.Clamp(XAngleChange, -70f, 40f);

        targetTransX = Quaternion.Euler(XAngleChange, 0, 0);

        rotateX.transform.localRotation = Quaternion.Slerp(rotateX.transform.localRotation, targetTransX, 2);
    }

}

人物控制：（挂载在人物身上）

public class MoveCtrl : MonoBehaviour

{

    private Vector3 offset;

    public GameObject mainCameraFa;

    public Camera mainCamera;

    private float smooth = 5f;

    private float speed = 5f;

    void Start()

    {

        offset = mainCameraFa.transform.position - transform.position;

    }

    void Update()

    {

        mainCameraFa.transform.position = Vector3.Lerp(mainCameraFa.transform.position, transform.position + offset, Time.deltaTime * smooth);

// Vector3.ProjectOnPlane( Vector3 vector，Vector3 planeNormal)
//得到投影向量 为vector到以planeNormal为法向量的平面上。

        Vector3 forward = Vector3.ProjectOnPlane(mainCamera.transform.forward, Vector3.up).normalized;

        Vector3 right = Vector3.ProjectOnPlane(mainCamera.transform.right, Vector3.up).normalized;

        if (Input.GetKey(KeyCode.W))

        {

            transform.position += forward * speed * Time.deltaTime;

        }

        if (Input.GetKey(KeyCode.S))

        {

            transform.position -= forward * speed * Time.deltaTime;

        }

        if (Input.GetKey(KeyCode.D))

        {

            transform.position += right * speed * Time.deltaTime;

        }

        if (Input.GetKey(KeyCode.A))

        {

            transform.position -= right * speed * Time.deltaTime;

        }

    }

}