一个主体或多个主体上的多个固定装置?

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问题描述

假设我想在屏幕上创建 1000 甚至 5000 条静态身体线条.我想知道的是，将所有这些线(夹具)连接到一个单一的身体上，或者将每个夹具放在自己的身体上有什么区别.两种方法之间是否存在性能差异，或者一种方法是否提供更多功能或对另一种方法的控制?

Let's say I wanted to create 1000, or maybe even 5000 static body lines on the screen. What I am wondering is, what is the difference between attaching all of these lines (fixtures) onto a single body, or placing each fixture onto its own body. Is there a performance difference between the two methods, or does one method provide more functionality or control over the other method?

下面显示了这两种方法的区别.

Below shows the difference between both methods.

将每一行附加到一个主体上:

Attaching each line onto a single body:

    // Create our body definition
    BodyDef groundBodyDef = new BodyDef();
    groundBodyDef.type = BodyType.StaticBody;

    // Create a body from the defintion and add it to the world
    Body groundBody = world.createBody(groundBodyDef);

    for (int i = 0; i < 1000; i++) {
        // Create our line
        EdgeShape ground = new EdgeShape();
        ground.set(x1, y1, x2, y2);
        groundBody.createFixture(ground, 0.0f);
        ground.dispose();
    }

将每一行附加到自己的身体上:

Attaching each line to their own body:

    // Create our body definition
    BodyDef groundBodyDef = new BodyDef();
    groundBodyDef.type = BodyType.StaticBody;

    for (int i = 0; i < 1000; i++) {
        // Create a body from the defintion and add it to the world
        Body groundBody = world.createBody(groundBodyDef);

        // Create our line
        EdgeShape ground = new EdgeShape();
        ground.set(x1, y1, x2, y2);
        groundBody.createFixture(ground, 0.0f);
        ground.dispose();
    }

此代码示例专门用于 libGDX，但我认为这是一个相当基本的 box2D 概念，即使没有 libGDX 经验也可以回答.

This code example is specifically in libGDX, however I imagine this is a fairly basic box2D concept and could be answered even without libGDX experience.

一个可能的功能差异的例子是，如果所有的行都附加到一个单一的身体，我们要调用 world.destroyBody(groundBody);，它也会破坏所有的线，但是如果每条线都连接到不同的主体，我们只会销毁一条线.

One example of a possible functionality difference is that if all of the lines are attached to a single body and we were to call world.destroyBody(groundBody);, it would also destroy all of the lines, however if each line is attached to a different body, we would only destroy one line.

即使这样也有很大的不同吗?我们可以简单地调用 groundBody.destroyFixture(fixture); 来销毁一行，如果它们都附加到一个主体上.

Does even this make a substantial difference though? We can simply call groundBody.destroyFixture(fixture); to destroy a single line if they are all attached to a single body.

一个主体或多个主体上的多个固定装置?

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