Unity3d创建物体，寻找物体，加载物体，添加脚本

using UnityEngine;

public class GetCreateObject : MonoBehaviour {
GameObject emptyGo;
Light goLight;
GameObject goCamera;
public Camera pCamera;
public Transform goRoot;
Transform transLight;

GameObject tank;

void Start () {
//创建物体：在当前场景中创建一个GameObject
emptyGo = new GameObject("New");

//寻找物体：获取当前GameObject的Component
goLight = GetComponent<Light>();
goLight.color = Color.red;

//寻找物体：获取当前场景中其他GameObject
goCamera = GameObject.Find("Main Camera");
goCamera.transform.Translate(0, 1, -9);

//创建物体：通过public属性，在Unity中拖动控件的方式
pCamera.transform.Translate(0, 1, 12);

//寻找物体：通过工具方法找到物体
FindChild(goRoot, "Light", ref transLight);
transLight.GetComponent<Light>().color = Color.green;

Debug.Log("Test");

//添加脚本：用代码方式创建GameObject并添加脚本
tank = new GameObject("Tank");
tank.AddComponent<Tank>();
}

/// <summary>
/// 寻找物体
/// </summary>
/// <param name="trans">作为父物体的tranform</param>
/// <param name="findName">名称</param>
/// <param name="_trans">找到的物体</param>
void FindChild(Transform trans, string findName, ref Transform _trans)
{
if (trans.name.Equals(findName))
{
_trans = trans.transform;
return;
}
if (trans.childCount != 0)
{
for(int i = 0, length = trans.childCount; i < length; i++)
{
FindChild(trans.GetChild(i), findName, ref _trans);
}
}
}
}

using UnityEngine;

public class Tank : MonoBehaviour {

//加载物体：拖动方式得到预置体
public GameObject goBullet;
private GameObject bullet;

//加载物体：用资源加载方式得到预置体，这种方式下资源要放在Assets/Resources文件夹下
private GameObject mBullet;
private GameObject myBullet;

// Use this for initialization
void Start () {
mBullet = Resources.Load("Bullet") as GameObject;
}

// Update is called once per frame
void Update () {
if (Input.GetButtonDown("Fire1"))
{
//让预置体生成在场景中
bullet = Instantiate(goBullet);
bullet.transform.parent = this.transform;
} else if(Input.GetButtonDown("Fire2")) {
myBullet = Instantiate(mBullet);
myBullet.transform.parent = this.transform;
}
}
}

using UnityEngine;

public class Bullet : MonoBehaviour {

Vector3 fwd;

// Use this for initialization
void Start () {
//向前向量
fwd = transform.TransformDirection(Vector3.forward);
}

// Update is called once per frame
void Update () {
//给一个向前的力，打出去
GetComponent<Rigidbody>().AddForce(fwd * 1000);
}
}