Unity 中的碰撞
想在 Unity 中实现碰撞来选择物体，所以先研究一下碰撞。[*]新建两个cube
[*]其中一个的 Box Collider 选上 IsTrigger
[*]添加上代码，写下 OnTriggerEnter Event
[*]让它们碰撞起来
public class BumpIntoSomething : MonoBehaviour
{
public float speed = 2000;
// Start is called before the first frame update
void Start()
{
}
// Update is called once per frame
void Update()
{
transform.Translate(Vector3.forward * Time.deltaTime * speed);
}
private void OnTriggerEnter(Collider other) {
Debug.Log( other.name );
}
}
即使碰撞发生，但是 OnTriggerEnter 并没有被调用。
Collider vs Rigidbody
发现不行，然后回头去看官方文档Collider.OnTriggerEnter(Collider)，原来：
Both GameObjects must contain a Collider component. One must have Collider.isTrigger enabled, and contain a Rigidbody. If both GameObjects have Collider.isTrigger enabled, no collision happens. The same applies when both GameObjects do not have a Rigidbody component.一定要有 Rigidbody 这个 component，再搜了一下:
No, at least one must have a rigidbody attached.两个物体之间必须要有一个 Rigidbody，至于原理，大概是因为碰撞是物理的，和 physics system 相关，所以一定要 Rigidbody，尝试把 Rigidbody 添加到两个物体上面任意一个，都 work。
随意的给另一个物体添加了代码：
public class ChangeColorWhenCollide : MonoBehaviour
{
private void OnTriggerEnter(Collider other) {
Debug.Log( "cube being collided" );
var renderer = GetComponent<Renderer>();
renderer.material.SetColor(&#34;_Color&#34;, Color.red);
}
}
参考：
[*]Collider.OnTriggerEnter(Collider)
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