ufo/Assets/Script/CameraFollow.cs

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

public class CameraFollow : MonoBehaviour
{

    public Transform playerPos;
    public float smooth = 8;

    private Vector3 offsetPos;

    private Vector3 originPos;
    private Quaternion originRot;

    public float shake_decay;
    public float shake_intensity;

    // Use this for initialization
    void Start()
    {
        offsetPos = transform.position - playerPos.position;
    }

    // Update is called once per frame
    void Update()
    {
        if (playerPos != null)
        {
            Vector3 camNewPos = playerPos.position + offsetPos;
            transform.position = Vector3.Lerp(transform.position, camNewPos, Time.deltaTime * smooth);
        }

        if (shake_intensity > 0)
        {
            transform.position = originPos + Random.insideUnitSphere * shake_intensity;
            transform.rotation = new Quaternion(
            originRot.x + Random.Range(-shake_intensity, shake_intensity) * 0.2f,
            originRot.y + Random.Range(-shake_intensity, shake_intensity) * 0.2f,
            originRot.z + Random.Range(-shake_intensity, shake_intensity) * 0.2f,
            originRot.w + Random.Range(-shake_intensity, shake_intensity) * 0.2f);
            shake_intensity -= shake_decay;
        }


    }

    public void Shake()
    {
        originPos = transform.position;
        originRot = transform.rotation;
        shake_intensity = 0.08f;
        shake_decay = 0.002f;

    }
}