关于unity3的中的碰撞检测

最近在研究unity3d，关于碰撞检测百度一下出来好多，都是说如下几个函数

OnTriggerEnter	OnTriggerEnter is called when the Collider other enters the trigger.
OnTriggerExit	OnTriggerExit is called when the Collider other has stopped touching the trigger.
OnTriggerStay	OnTriggerStay is called almost all the frames for every Collider other that is touching the trigger.
OnCollisionEnter	OnCollisionEnter is called when this collider/rigidbody has begun touching another rigidbody/collider.
OnCollisionExit	OnCollisionExit is called when this collider/rigidbody has stopped touching another rigidbody/collider.
OnCollisionStay	OnCollisionStay is called once per frame for every collider/rigidbody that is touching rigidbody/collider.

哎，也许是本人不才怎么搞都不走这几个函数，可能是网上的步骤太简单了。
下边我说下我的详细步骤吧，

首先假设场景中有一个椅子chair和一个默认的camera，然后建立一个脚本movecamera.js，将这个脚本附加到camera上，并且加上OnCollisionEnter函数。

然后给camera加上组件character controller，（具体怎么加，选中camera然后component－》physics－》character controller）。

再选中chair给它加上组件mesh collider（网格碰撞器）和rigidbody（具体怎么加同上）。然后播放后，移动camera到椅子那里就回走OnCollisionEnter这个函数了。