unity笔记 0 - 添加物体，预制体；施加力；移动物体，旋转物体；相机跟随；禁用物体

添加物体

GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube);
cube.AddComponent<Rigidbody>();
cube.transform.position = new Vector3(x, y, z);

添加预制体

    public Transform brick;
    // Use this for initialization
    void Start()
    {
         Instantiate(brick, new Vector3(x, y, z), Quaternion.identity);
    }

给物体施加一个力

    Rigidbody rigidbody;
    // Use this for initialization
    void Start () {
        rigidbody = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void Update () {
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

        rigidbody.AddForce(movement * 10f);
    }

移动物体

    // Update is called once per frame
    void Update () {
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
        this.transform.Translate(movement * 0.04F, Space.Self);
        //transform.Translate(Vector3.forward * 0.04F,Space.Self);
    }

旋转物体

    // Update is called once per frame
    void Update () {
        transform.Rotate(new Vector3(15, 30, 45) * Time.deltaTime);
        //Time.deltaTime为上一帧到这一帧的时间
        //乘上Time.deltaTime程序从每帧变化变成每秒变化
    }

关于deltaTime的解释

deltaTime是你这一帧到上一帧经历的时间。
假设一秒走10帧，每帧不太稳定，间隔时间不一样，用 t0，t1，t2…t9来表示，他们们满足 t0 + t1 + t2 + … + t9 = 1
现在你定义了一个速度 V=5，意思是想要1秒走5米，现在设每帧所走的路程是 s0，s1，s2，…s9
满足 s0=V*t0，s1=V*t1，s2=V*t2，…s9=V*t9
那么看看1秒走了多少路程：
S = s0+s1+s2+…s9
= V*(t0+t1+t2+…+t9)
=V*1
=V
=5
引用自百度贴吧- Cairne愷恩（本贴3L）

相机跟随

    public GameObject player;
    private Vector3 offset;
    // Use this for initialization
    void Start () {
        offset =  transform.position - player.transform.position;
    }

    // Update is called once per frame
    void Update () {
        transform.position = player.transform.position + offset;
    }

禁用物体

this.gameObject.SetActive(false);

unity笔记 0 - 添加物体，预制体；施加力；移动物体，旋转物体；相机跟随；禁用物体

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