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Box2d-绳索和距离关节特征之间的折衷

[英]Box2d - compromise between rope and distance joint features

原文 2013-04-20 16:02:52 4 1 java/ box2d

I am struggling with this issue since few weeks, I am making game using BOX2D physics engine (latest version) where I got crane, I needed rope, so at beginning I used distance joint, with anchor points set between hook of the crane, and its arm, it works quite okay. 几个星期以来，我一直在努力解决这个问题，我使用BOX2D物理引擎（最新版本）制作游戏，在那里我需要起重机，我需要绳索，因此开始时我使用了距离关节，在起重机的吊钩之间设置了锚点，并且它的手臂，效果还不错。

I just draw line between those two anchor points, so it looks like a rope. 我只是在这两个锚点之间画线，所以它看起来像一根绳子。

Distance Joint: 距离关节：

Pros: 优点：

Little bit elastic look, looks and behaves more realistic. 有点弹性的外观，外观和行为更逼真。
I can modify length of my rope on the runtime. 我可以在运行时修改绳子的长度。

Cons: 缺点：

there is a minimal distance, so it often start to behave strange (trying to keep minimal distance) while rope is to long. 有一个最小的距离，因此当绳索很长时，它通常会开始表现出奇怪的行为（试图保持最小的距离）。
- can lift only light objects 只能举起轻的物体

Rope Joint: 绳接头：

Pros: 优点：

can lift any object, no matter how heavy it is 可以举起任何物体，无论它有多重
there is no minimal distance, so it does not get crazy trying to keep minimal distance 没有最小距离，因此保持最小距离不会发疯

Cons: 缺点：

is not flexible at all, so not really realistic. 根本不灵活，所以不是很现实。

Is there any way to combine them, achieving good result, where: 有什么方法可以将它们结合起来，取得良好的结果，其中：

can pick any load (no matter how heavy it is) 可以拾取任何负载（无论它有多重）
can adjust elastics slightly to give it more realistic feel 可以稍微调整松紧带，使其更真实
no minimal distance 没有最小距离

Thanks in advance for any help. 在此先感谢您的帮助。

1 个解决方案

What is the rope joint connected to at the top? 顶部的绳索接头连接到什么位置？ Maybe you could make the top body a little bit moveable eg. 也许您可以使顶部主体移动一些，例如。 make it dynamic, and connect it to a static body with a soft joint like a weld joint (and probably another rope joint to stop it moving too far). 使其动态，然后通过软接头（如焊接接头）将其连接到静态物体（可能还有另一个绳索接头以阻止其移动太远）。