Unity 2D平台在碰撞中展示

Question

How can I make a group of platforms appear when colliding with it's trigger?

I would like to walk into the trigger, which will turn on the 'StarPlatforms' in the inspector, revealing every thing that is a child of it. I have only got it to do the exact opposite:

Before collision

After Collision

Children of StarPlatfroms

The script on the StarPlatforms :

public class AppearTrigger : MonoBehaviour {

    private GameObject StarPlatforms;

    void Start() {
        StarPlatforms = GameObject.Find("StarPlatforms");
        StarPlatforms.gameObject.SetActive (true);
    }

    void OnTriggerStay2D (Collider2D col) {
        if (col.gameObject.tag == "Player") {
            StarPlatforms.gameObject.SetActive (false);

        }               
    }
}

I have tried swapping the .SetActives too false then true and it unchecks in the inspector on Play but stays hidden on collision with the trigger.

Thank you for your time.

ps: this is my first go at Unity & C#

Answer 1

SetActive just sets whether it is part of the main game loop or not. To make a platform invisible or visible use it's Renderer component and deactivate that instead.

gameObject.GetComponent<SpriteRenderer>().enabled = false;

Answer 2

I would like to walk into the trigger, which will turn on the 'StarPlatforms' in the inspector. I have tried swapping the .SetActives too false then true

You seem to be guessing which one works. This is how SetActive work:

To turn on or activate an object, pass true to SetActive . To turn it off or deactivate it, pass false to it. Also, this should be done in the OnTriggerEnter2D function not OnTriggerStay2D .

The OnTriggerStay2D function is called when collision each frame collision is still touching. The OnTriggerEnter2D function is called when there is a collision. OnTriggerExit2D is called when there is no longer a collision.

void OnTriggerEnter2D (Collider2D col) 
{
    if (col.CompareTag("Player")) 
    {
        StarPlatforms.gameObject.SetActive (true);
    } 
}

If you also want to turn it of or de-activate it when they no longer touch, pass false to the SetActive function in the OnTriggerExit function.

void OnTriggerExit2D(Collider2D col)
{
    if (col.CompareTag("Player")) 
    {
        StarPlatforms.gameObject.SetActive (false);
    } 
}

Not related to your issue but it's a good practice to use CompareTag instead of gameObject.tag .

Answer 3

This is what worked:

public class AppearTrigger : MonoBehaviour {

GameObject[] StarPlatfromArray;

void Start() {
    StarPlatfromArray = GameObject.FindGameObjectsWithTag("Cave");
    for (int i = 0; i < StarPlatfromArray.Length; i=i+1) {
        StarPlatfromArray [i].gameObject.GetComponent<BoxCollider2D> ().enabled = false;
        StarPlatfromArray [i].gameObject.GetComponent<SpriteRenderer> ().enabled = false;
    }
}

void OnTriggerEnter2D (Collider2D col) {
    StarPlatfromArray = GameObject.FindGameObjectsWithTag("Cave");
    for (int i = 0; i < StarPlatfromArray.Length; i++) {
        StarPlatfromArray [i].gameObject.GetComponent<BoxCollider2D> ().enabled = true;
        StarPlatfromArray [i].gameObject.GetComponent<SpriteRenderer> ().enabled = true;
    }

}

}