OnTriggerStay不会在每一帧都调用 [英] OnTriggerStay not called every frame

问题描述

我有2个相同的GameObjects(弹坑-预制件)和2个需要包装箱的位置.当玩家将第一个板条箱推到位置1时，该板条箱所附脚本中的OnTriggerStay会激活并一直执行该工作(在控制台中打印).问题是，当第二个板条箱到达第二个位置时，它会工作20-30次(打印)然后停止，那么我只需触摸它(稍微移动一下)，然后它又会工作20-30次并停止./p>

以下是附在包装箱上的脚本:

public class Block : MonoBehaviour
{
    public BlockType blockType;
    public int blockId;

    // Use this for initialization
    void Start ()
    {

    }

    // Update is called once per frame
    void Update ()
    {

    }

    private void OnTriggerStay2D(Collider2D col)
    {
        if (gameObject.GetComponent<Block>() != null)
        {
            if (col.GetComponent<Block>().blockType == BlockType.Crate && gameObject.GetComponent<Block>().blockType == BlockType.Point)
                {
                float distance = Vector3.Distance(this.transform.position, col.transform.position);

                Debug.Log(col.GetComponent<Block>().blockId + ": " + distance); //for testing, distance is <= 0.05 and it doesn't display

                if (distance <= 0.05)
                {
                    PlayScene.CrateOnPoint(col.GetComponent<Block>().blockId);
                    Debug.Log("On place: " + col.GetComponent<Block>().blockId);
                }
            }
        }
    }
}

解决方案

OnTriggerStay用于检测GameObject何时仍一次与另一个GameObject接触.您不应将其用作检测GameObjects是否触摸每一帧的方法，因为有时它只会被调用几次.

执行此操作的最佳方法是使用带有布尔变量的Update，OnTriggerEnterXXX和OnTriggerExitXXX函数.在OnTriggerEnterXXX中调用时，将其设置为true；在OnTriggerExitXXX中调用时，将其设置为false.然后，您可以在Update函数的每一帧中检查此布尔变量.

bool triggered = false;

private void Update()
{
    if (triggered)
    {
        //Do something!
    }
}

void OnTriggerEnter2D(Collider2D collision)
{
    Debug.Log("Entered");
    if (collision.gameObject.CompareTag("SomeObject"))
    {
        triggered = true;
    }
}

void OnTriggerExit2D(Collider2D collision)
{

    Debug.Log("Exited");
    if (collision.gameObject.CompareTag("SomeObject"))
    {
        triggered = false;
    }
}

I have 2 identical GameObjects (crates - prefabs) and 2 spots where that crates need to get. When player push first crate to spot 1, OnTriggerStay in script attached to that crate activate and do the job all time (print in console). Problem is that when second crate get to second spot, it do job 20-30 times (print) and then stop, then I need to just touch it (move a little) and again it does job 20-30 times and stop.

Here is script attached to crates:

public class Block : MonoBehaviour
{
    public BlockType blockType;
    public int blockId;

    // Use this for initialization
    void Start ()
    {

    }

    // Update is called once per frame
    void Update ()
    {

    }

    private void OnTriggerStay2D(Collider2D col)
    {
        if (gameObject.GetComponent<Block>() != null)
        {
            if (col.GetComponent<Block>().blockType == BlockType.Crate && gameObject.GetComponent<Block>().blockType == BlockType.Point)
                {
                float distance = Vector3.Distance(this.transform.position, col.transform.position);

                Debug.Log(col.GetComponent<Block>().blockId + ": " + distance); //for testing, distance is <= 0.05 and it doesn't display

                if (distance <= 0.05)
                {
                    PlayScene.CrateOnPoint(col.GetComponent<Block>().blockId);
                    Debug.Log("On place: " + col.GetComponent<Block>().blockId);
                }
            }
        }
    }
}

解决方案

OnTriggerStay is used to detect when a GameObject is still touching with another GameObject once. You should not use it as a way to detect if GameObjects are touching every frame because sometimes, it is only called few times.

The best way to do this is with the Update, OnTriggerEnterXXX and the OnTriggerExitXXX functions with a boolean variable. You set it to true when in the OnTriggerEnterXXX is called then to false when OnTriggerExitXXX is called. You then check this boolean variable every frame in the Update function.

bool triggered = false;

private void Update()
{
    if (triggered)
    {
        //Do something!
    }
}

void OnTriggerEnter2D(Collider2D collision)
{
    Debug.Log("Entered");
    if (collision.gameObject.CompareTag("SomeObject"))
    {
        triggered = true;
    }
}

void OnTriggerExit2D(Collider2D collision)
{

    Debug.Log("Exited");
    if (collision.gameObject.CompareTag("SomeObject"))
    {
        triggered = false;
    }
}

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