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为什么还要使用运动机构？ Box2D的

[英]Why even use kinematic bodies? box2d

原文 2017-03-06 20:32:56 4 1 c++/ box2d

Why should you even use kinematic bodies instead of dynamic bodies with no gravity? 为什么还要使用运动物体代替没有重力的动态物体？ I mean a dynamic body can also collide with static bodies and have some other adjustable parameters that kinematic bodies do not have, right. 我的意思是，动态物体还可以与静态物体碰撞，并且具有运动物体没有的其他一些可调参数，对。 Therefore, I would really love to hear why you would want to do this and if it even can be lead to some advantages. 因此，我真的很想听听您为什么要这样做，甚至可以带来一些好处。

Your time is much appreciated! 感谢您的宝贵时间！

1 个解决方案

It's a matter of what you want b2World::Step to do to the body. 这b2World::Step您想要b2World::Step对身体做的事情。 Basically this method's body related post-conditions are as follows: 基本上，此方法与身体相关的后置条件如下：

Static bodies are unmoved. 静态物体不动。
Kinetic bodies are moved based on their previous velocities. 动体根据其先前的速度移动。
Dynamic bodies are moved based on their previous velocities, gravity, applied forces, applied impulses, masses, damping, and the restitution and friction values of their fixtures when they experience collisions. 动体会根据其先前的速度，重力，所施加的力，所施加的脉冲，质量，阻尼以及遇到碰撞时其固定装置的恢复和摩擦值进行移动。

So kinematic bodies can be useful when the only thing that you want to have happen to the body is to have it moved based on a velocity you'd given it. 因此，当您要发生在身体上的唯一事情是根据给定的速度移动身体时，运动身体可能会很有用。