物理
Unity3D中简单的碰撞检测实现详解
http://blog.csdn.net/huang9012/article/details/23033129
http://blog.csdn.net/zooen2011/article/details/12245529
http://blog.csdn.net/haohan_meng/article/details/18010329
基于层的碰撞检测 Layer-Based Collision Detection.
http://game.ceeger.com/Components/LayerBasedCollision.html
力距
http://baike.baidu.com/link?url=8HADvdAWKeTENyqFqjliFpkojrt6XuT4JCMCagEMiBETyNk2AQ7426uIPhkpp9g77yDHs7MWfH0tpsW2uSBlqK
Unity3D让物体惯性的旋转
http://www.linuxidc.com/Linux/2012-04/59391.htm
UNITY3D物理引擎Rigidbody,Collider,PhysicMaterial的整理
http://blog.csdn.net/jbjwpzyl3611421/article/details/12780823