FollowingCocpit_2.cs

using UnityEngine;
using System.Collections;

public class FollowingCocpit_2 : MonoBehaviour {

    private Transform _followedTarget;//<! 追従対象
    private Transform _cockpitPosTra;//<! コクピット収納位置
    private Transform _dummyTarget;//<! 追従対象のダミー（ダメージモーション等のとき、本来の頭の位置に設置する）
    private Transform _player;
    private float _t = 0f;

    [SerializeField] private float _limitRot = 0f;
    [SerializeField] private float _accelerationInLimitRot = 5f;
    [SerializeField] private float _rotSpeed = 1f;
    [SerializeField] private float _posSpeed = 0.3f;

    void Start()
    {
        // プレイヤーからアクセスできるよう自身を登録
        _player = GameObject.FindWithTag("Player").transform;
        _player.GetComponent<MSManager>().SetCockpitFollowing(this);
        // コクピット収納位置
        _cockpitPosTra = _player.GetComponent<MSManager>().msData.GetCockpitPositionTransform();
        transform.position = _cockpitPosTra.position;
        // 最初はコクピット収納位置に追従
        _followedTarget = _cockpitPosTra;
        //ダミーを複製しておく
        _dummyTarget = Object.Instantiate(_cockpitPosTra.gameObject).transform;
        _dummyTarget.name = _cockpitPosTra.gameObject.name + " Dummy";
        JoinToRealHead();
    }
    
    void Update()
    {
        if (_followedTarget == null) return;
        ControlRotation();
        ControlPosition();//アニメーション適用後なので、IKにより位置が変わると差異が生まれる
        Debug.DrawLine(_dummyTarget.position, _followedTarget.position,Color.red);
    }
    
    void ControlPosition()
    {
        if (transform.position == _cockpitPosTra.position && _t == 1) return;
        _t = Mathf.Clamp01(_t + Time.deltaTime * _posSpeed);
        Debug.Log(_t);
        Vector3 goal = Vector3.Lerp(_dummyTarget.position, _cockpitPosTra.position, _t);//_dummyTarget.position が _cockpitPosTra.positionと同値の場合、_tは無関係
        transform.position = goal;
    }

    void ControlRotation()
    {
        //回転の追従
        float angle = Quaternion.Angle(transform.rotation, _followedTarget.rotation);
        float amp = 1 + Mathf.InverseLerp(_limitRot, 180, angle) * _accelerationInLimitRot;
        transform.rotation = Quaternion.Slerp(transform.rotation, _followedTarget.rotation, Time.deltaTime * _rotSpeed * amp);
    }

    //! Animatorから呼び出す
    public void LeaveFromRealHead()
    {
        _t = 0;
        if (_followedTarget == _dummyTarget) return;
        Debug.Log("Leave");
        //! 呼ばれた時点での頭の座標と向きをコピー
        _dummyTarget.position = _cockpitPosTra.position;
        _dummyTarget.rotation = _cockpitPosTra.rotation;
        //親を変える
        _dummyTarget.parent = _player.transform;
        //! 追従対象を変える
        _followedTarget = _dummyTarget;
    }

    //! Animatorから呼び出す
    public void JoinToRealHead()
    {
        Debug.Log("Join");
        //! 呼ばれた時点での頭の座標と向きをコピー
        _dummyTarget.position = _cockpitPosTra.position;
        _dummyTarget.rotation = _cockpitPosTra.rotation;
        //親を変える
        _dummyTarget.parent = _cockpitPosTra.transform;
        //! 追従対象を変える
        _followedTarget = _cockpitPosTra;
    }
}