Unity3D第三人称摄像机

首先，在场景中导入人物模型，将其放在世界坐标的原点处。 创建一个名为CameraBase的空物体，把该物体移动至人物模型的上半身的中央处，世界坐标为（0, 1.35, 0），这个物体相当于是摄像机的基准点。随后我把摄像机设为CameraBase的子物体，把摄像机拖到人物模型的后方，局部坐标为（0, 0, -2）。然后再创建一个名为CameraFollow的空物体，设为人物模型的子物体，局部坐标为（0, 1.35, 0）。

把以下脚本挂载到CameraBase上

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraFollow : MonoBehaviour {

    private float CameraMoveSpeed = 120.0f;
    public GameObject CameraFollowObj;
    Vector3 FollowPOS;
    public float ClampAngle = 80.0f;
    public float InputSensitivity = 150.0f;
    public GameObject CameraObj;
    public GameObject PlayerObj;
    public float camDistanceXtoPlayer;
    public float camDistanceYtoPlayer;
    public float camDistanceZtoPlayer;
    public float mouseX;
    public float mouseY;
    public float finalInputX;
    public float finalInputZ;
    public float smoothX;
    public float smoothY;
    private float rotY = 0.0f;
    private float rotX = 0.0f;


    // Use this for initialization
    void Start () {
        Vector3 rot = transform.localRotation.eulerAngles;
        rotY = rot.y;
        rotX = rot.x;
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
	}
	
	// Update is called once per frame
	void Update () {

        float inputX = Input.GetAxis("RightStickHorizontal");
        float inputZ = Input.GetAxis("RightStickVertical");
        mouseX = Input.GetAxis("Mouse X");
        mouseY = Input.GetAxis("Mouse Y");
        finalInputX = inputX + mouseX;
        finalInputZ = inputZ + mouseY;

        rotY += finalInputX * InputSensitivity * Time.deltaTime;
        rotX += finalInputZ * InputSensitivity * Time.deltaTime;

        rotX = Mathf.Clamp(rotX, -ClampAngle, ClampAngle);

        Quaternion localRotation = Quaternion.Euler(rotX, rotY, 0.0f);
        transform.rotation = localRotation;
    }

    void LateUpdate()
    {
        CameraUpdater();
    }

    void CameraUpdater()
    {
        Transform target = CameraFollowObj.transform;

        float step = CameraMoveSpeed * Time.deltaTime;
        transform.position = Vector3.MoveTowards(transform.position, target.position, step);
    }
}

将以下脚本挂载到摄像机上

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraCollision : MonoBehaviour {

    public float minDistance = 0.2f;
    public float maxDistance = 2.0f;
    public float smooth = 5.0f;
    Vector3 dollyDir;
    public Vector3 dollyDirAdjusted;
    public float distance;

    void Awake()
    {
        dollyDir = transform.localPosition.normalized;
        distance = transform.localPosition.magnitude;
    }

    // Update is called once per frame
    void Update () {

        Vector3 desiredCameraPos = transform.parent.TransformPoint(dollyDir * maxDistance);
        RaycastHit hit;

        if (Physics.Linecast(transform.parent.position, desiredCameraPos, out hit))
        {
            distance = Mathf.Clamp(hit.distance * 0.85f, minDistance, maxDistance);
        }
        else
        {
            distance = maxDistance;
        }

        transform.localPosition = Vector3.Lerp(transform.localPosition, dollyDir * distance, Time.deltaTime * smooth);
	}
}