这次作业主要在上次的基础上，增加了一个mode用来adapt不同的物理模式，增加了一个FhysicsActionManager来管理物理运动的模式，在开始前有两个按钮可以选择Kinematic或Physics模式，在物理模式下，在创建disk时给物体增加一个刚体属性，并给其一个初速度，因重力作用会有抛物线运动，而且会与地面产生碰撞。
演示视频链接：http://v.youku.com/v_show/id_XMzU2MjM3MDk5Mg==.html?spm=a2h0k.8191407.0.0&from=s1.8-1-1.2
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