Unity3D学习笔记2－应用脚本控制物体运动

在Assert/Script下创建新的C# Script，命名后会自动生成类，自动继承于MonoBehaviour类。增加简单的代码实现物体移动：
TestPlayer.cs

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

public class TestPlayer : MonoBehaviour {

    //公有类成员变量，将会显示在Unity的Inspector界面中
    public float walkSpeed = 2f;

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {
        WalkForward();
        return;
    }

    void FixedUpdate()
    {
        //和时间无关，所以移动需要把Time.deltaTime去掉，walkSpeed取值0.1即可
        //transform.position = transform.position + walkSpeed * transform.forward;
    }

    void WalkForward()
    {
        transform.position = transform.position + walkSpeed * transform.forward * Time.deltaTime;
    }
}

然后将此TestPlayer.cs拖入相应物体(比如player)的Onspector界面中，你会看到可以控制改变类的公有变量walkSpeed值。运行即可看到物体player移动。

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下面用一下LateUpdate实现一下 摄像机跟随的功能
创建TestSceneCamera.cs拖到Main Camera的Inspector中

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

public class TestSceneCamera : MonoBehaviour {

    public GameObject player;

    // Use this for initialization
    void Start () {

    }

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

    }

    void LateUpdate()
    {
        if(player != null)
            this.transform.LookAt (player.transform.position);
    }
}

TestPlayer.cs的Start()函数中将自己指向 TestSceneCamera类中的player变量

……//省略代码见最上面TestPlayer.cs

public class TestPlayer : MonoBehaviour {

    //公有类成员变量，将会显示在Unity的Inspector界面中
    public float walkSpeed = 2f;

    // Use this for initialization
    void Start () {
        //将自己指给TestSceneGame类中的player;
        GameObject.Find("Main Camera").GetComponent().player = this.gameObject;
    }

……

}

这样物体player移动的时候，摄像机一直望向（LookAt）player

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总结笔记来自于视频教程：http://www.imooc.com/video/7334