如何统一移动游戏预制件

Question

Below is my code but I don't know why when the _lazerPrefab spawns it doesn't move, even though _lazerSpeed != 0 . I dont't know where the problem is.

if (Input.GetKeyDown(KeyCode.Space))
{
    Instantiate(_lazerPrefab, transform.position, Quaternion.identity);
    _lazerPrefab.transform.Translate(Vector3.up * _lazerSpeed * Time.deltaTime);
}

Answer 1

You cannot move the prefab itself, as prefabs are like "blueprints" that are used to construct real object instances, hence the name. You can indeed move those instances. Instantiate() will return the reference to the newly created copy/instance!

if (Input.GetKeyDown(KeyCode.Space))
{
    GameObject new_lazer = Instantiate(_lazerPrefab, transform.position, Quaternion.identity);
    new_lazer.transform.Translate(Vector3.up * _lazerSpeed * Time.deltaTime);
}

But this code will always spawn a new instance when you press Space. And once you spawned a 2nd, you will no longer move the first as the Translate call for the first instance is not done anymore.

So you need to adapt your logic. Either put a "move/accelerate forward" script on the lazers, or keep the references returned from Instantiate() in a list and maintain them and their lifetime.

Answer 2

You are only moving the _lazerprefab when Input.GetKeyDown(KeyCode.Space) is true.

If you want to move the gameObject more than once after you press space you would need to add the move code into the gameObjects Update() Method itself.

You would need to attach this script to the _lazerprefab GameObject.

Example Script:

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

public class MoveObstacles : MonoBehaviour {
    [SerializeField]
    private float _lazerSpeed = 10f;

    private void FixedUpdate() {
        gameObject.transform.Translate(Vector3.up * _lazerSpeed * Time.deltaTime);
    }
}

---

We are now able to just call the Instantiate() Function and the instantiated GameObject will move automatically each frame.

Example Move Call:

if (Input.GetKeyDown(KeyCode.Space)) {
    Instantiate(_lazerPrefab, transform.position, Quaternion.identity);
}