Collision.contacts

# [Collision](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collision.html).contacts

public ContactPoint[] **contacts** ;

## 描述

物理引擎生成的接触点。应避免使用它，因为它会产生内存垃圾。改用 [GetContact](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collision.GetContact.html) 或 [GetContacts](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collision.GetContacts.html)。

每个接触均包含一个接触点、法线和碰撞的两个碰撞体（请参阅 [ContactPoint](https://docs.unity3d.com/cn/2019.4/ScriptReference/ContactPoint.html)）。 从内部 [OnCollisionStay](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collider.OnCollisionStay.html) 或 [OnCollisionEnter](https://docs.unity3d.com/cn/2019.4/ScriptReference/Collider.OnCollisionEnter.html)，能够 始终确保 `contacts` 至少有一个元素。

```
using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    void OnCollisionStay(Collision collision)
    {
        foreach (ContactPoint contact in collision.contacts)
        {
            print(contact.thisCollider.name + " hit " + contact.otherCollider.name);
            // Visualize the contact point
            Debug.DrawRay(contact.point, contact.normal, Color.white);
        }
    }
}
```

```
// A grenade
// - instantiates an explosion Prefab when hitting a surface
// - then destroys itself

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Transform explosionPrefab;
    void OnCollisionEnter(Collision collision)
    {
        ContactPoint contact = collision.contacts[0];
        Quaternion rot = Quaternion.FromToRotation(Vector3.up, contact.normal);
        Vector3 pos = contact.point;
        Instantiate(explosionPrefab, pos, rot);
        Destroy(gameObject);
    }
}
```