有些游戏在场景中保留恒定数量的对象,但是在游戏运行过程中创建和删除角色、宝藏和其他对象是很常见的做法。在 Unity 中,可以使用 Instantiate 函数来创建游戏对象。该函数可以生成现有对象的新副本:
public GameObject enemy;
void Start() {
for (int i = 0; i < 5; i++) {
Instantiate(enemy);
}
}
请注意,进行复制的源对象不必存在于场景中。更常见的做法是在 Editor 中使用从 Project 面板拖动到公共变量的预制件。此外,实例化游戏对象将复制原始对象中存在的所有组件。
此外,还有一个 Destroy 函数。该函数将在帧更新完成后或选择在短时间延迟后销毁对象:
void OnCollisionEnter(Collision otherObj) {
if (otherObj.gameObject.tag == "Missile") {
Destroy(gameObject,.5f);
}
}
请注意,Destroy 函数可以在不影响游戏对象本身的情况下销毁个别组件。一个常见的错误就是编写如下代码:
Destroy(this);
…这种情况下实际只会销毁调用该函数的脚本组件,而不是销毁附加脚本的游戏对象。
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