18.unity实例化(上)(Instantiate)

Instantiate实例化，用於将物件生成至场景中。(参考unity手册)

适合用在复制一样的物件，大量生成。这一次主要是想用实例化来生成苹果，在场中自动放很多颗苹果!!

先来看定义

//宣告建构式
public static Object Instantiate(Object original);
public static Object Instantiate(Object original, Transform parent);
public static 
Object Instantiate(Object original, Transform parent, bool instantiateInWorldSpace);
public static Object Instantiate(Object original, Vector3 position, Quaternion rotation);
public static Object Instantiate(Object original, Vector3 position, Quaternion rotation, Transform parent);

• Object original ：生成物件，要复制的Object，可以是GameObject也可以是UI或其他物件。
• Transform parent：父物件(parent)，会将生成物件设定为该物件的子物件(child)。
• bool instantiateInWorldSpace：当生成於父物件底下时，可以选择依照世界座标(true)还是父物件座标(false)生成。
• Vector3 position：Position for the new object. 设置Position，生成於此位置座标。
• Quaternion rotation：Orientation of the new object. 设置Rotation，生成於此旋转角度。

※没有要旋转的时候，旋转向量可以填这个：Quaternion.identity

实际例子1-生成

1.先创建好要复制的物件

2.写好脚本，挂在空物件上

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

public class InstantiateApple : MonoBehaviour
{   
    //宣告生成物件
    public GameObject apple;
    //设置三个生成位置
    Vector3 position1 = new Vector3(-1.039978f,-0.330002f,0.0f);
    Vector3 position2 = new Vector3(-0.039978f,-1.330002f,0.0f);
    Vector3 position3 = new Vector3(-0.039978f,-0.330002f,0.0f);
	//设置旋转
	Quaternion rotation1 = new Quaternion(0,0,0,0);

    void Start()
    {   
        Instantiate(apple,position1, rotation1);
        Instantiate(apple,position2, new Quaternion(0,0,0,0));
        Instantiate(apple,position3, Quaternion.identity);

    }

挂完脚本之後记得将要复制的物件拖曳进去。

3.设定好之後执行

实际例子2-整理至父物件

1.做法都一样，改脚本

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

public class InstantiateApple : MonoBehaviour
{   
    //宣告要生成的物件
    public GameObject apple;
    //宣告生成物件的父物件
    public Transform appleClass;
    //三个生成位置
    Vector3 position1 = new Vector3(-1.039978f,-0.330002f,0.0f);
    Vector3 position2 = new Vector3(-0.039978f,-1.330002f,0.0f);
    Vector3 position3 = new Vector3(-0.039978f,-0.330002f,0.0f);
	//设置旋转
    Quaternion rotation1 = new Quaternion(0,0,0,0);

    void Start()
    {   
        Instantiate(apple,position1, rotation1,appleClass);
        Instantiate(apple,position2, new Quaternion(0,0,0,0),appleClass);
        Instantiate(apple,position3, Quaternion.identity,appleClass);

    }
}

2.结果