c# - 在 Unity 中检测重叠二维对象的输入碰撞

Question

我正在开发一个应用程序，其中有许多球漂浮在周围但不会相互碰撞。这意味着它们有很多重叠。我明白了，如果你点击/触摸球，它们就会被摧毁。但是，如果一个球在另一个球的后面，则在前面的球被清除之前，这个球不会被摧毁。

上图显示了我正在寻找的内容，如果用户在位置 x 处单击/触摸，则销毁所有对象，而不仅仅是最前面的对象。非常感谢任何帮助。

这是我的输入脚本:

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

public class TouchInput : MonoBehaviour {

    public LayerMask touchInputMask;
    private List<GameObject> touchList = new List<GameObject> ();
    private GameObject[] touchesOld;
    private RaycastHit2D hit;

    void Update () {


#if UNITY_EDITOR

        if (Input.GetMouseButton(0) || Input.GetMouseButtonDown(0) || Input.GetMouseButtonUp(0)) {

            touchesOld = new GameObject[touchList.Count];
            touchList.CopyTo (touchesOld);
            touchList.Clear ();


            hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero, touchInputMask);
            //Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);

            if (hit) {

                GameObject recipient = hit.transform.gameObject;
                touchList.Add (recipient);

                if (Input.GetMouseButtonDown(0)) {
                    recipient.SendMessage ("OnTouchDown",hit.point,SendMessageOptions.DontRequireReceiver);

                }
                if (Input.GetMouseButtonUp(0)) {
                    recipient.SendMessage ("OnTouchUp",hit.point,SendMessageOptions.DontRequireReceiver);

                }
                if (Input.GetMouseButton(0)) {
                    recipient.SendMessage ("OnTouchStay",hit.point,SendMessageOptions.DontRequireReceiver);

                }

            }

            foreach (GameObject g in touchesOld) {
                if (!touchList.Contains (g)) {
                    if(g!=null) {
                        g.SendMessage ("OnTouchExit", hit.point, SendMessageOptions.DontRequireReceiver);
                    }

                }
            }

        }

#endif

        if (Input.touchCount > 0) {

            touchesOld = new GameObject[touchList.Count];
            touchList.CopyTo (touchesOld);
            touchList.Clear ();

            foreach (Touch touch in Input.touches) {

                hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero, touchInputMask);

                if (hit) {

                    GameObject recipient = hit.transform.gameObject;
                    touchList.Add (recipient);

                    if (touch.phase == TouchPhase.Began) {
                        recipient.SendMessage ("OnTouchDown",hit.point,SendMessageOptions.DontRequireReceiver);

                    }
                    if (touch.phase == TouchPhase.Ended) {
                        recipient.SendMessage ("OnTouchUp",hit.point,SendMessageOptions.DontRequireReceiver);

                    }
                    if (touch.phase == TouchPhase.Stationary) {
                        recipient.SendMessage ("OnTouchStay",hit.point,SendMessageOptions.DontRequireReceiver);

                    }
                    if (touch.phase == TouchPhase.Canceled) {
                        recipient.SendMessage ("OnTouchExit",hit.point,SendMessageOptions.DontRequireReceiver);

                    }

                }

            }

            foreach (GameObject g in touchesOld) {
                if (!touchList.Contains (g)) {
                    if (g != null) {
                        g.SendMessage ("OnTouchExit", hit.point, SendMessageOptions.DontRequireReceiver);
                    }

                }
            }

        }

    }
}

在球上我只是有一个:

    void OnTouchDown() {

    KillBall ();
}

void OnTouchStay() {

    KillBall ();

}

Answer 1

@Savlon 提供的答案，非常感谢:)

private RaycastHit2D[] hits;

...

hits = Physics2D.RaycastAll(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero, touchInputMask);

        foreach(RaycastHit2D hit in hits) {

            GameObject recipient = hit.transform.gameObject;
            touchList.Add (recipient);

            if (Input.GetMouseButtonDown(0)) {
                recipient.SendMessage ("OnTouchDown",hit.point,SendMessageOptions.DontRequireReceiver);

            }
            if (Input.GetMouseButtonUp(0)) {
                recipient.SendMessage ("OnTouchUp",hit.point,SendMessageOptions.DontRequireReceiver);

            }
            if (Input.GetMouseButton(0)) {
                recipient.SendMessage ("OnTouch",hit.point,SendMessageOptions.DontRequireReceiver);

            }


        }