如何在碰撞后删除Box2dWeb中的主体 [英] How do I remove a body in Box2dWeb after a collision

问题描述

在Update函数内部，如果2个实体发生碰撞，我想删除它们（或将它们标记为需要删除，并在时间步骤结束时删除它们）。我将如何实现这一目标？

Inside of the Update function, if 2 bodies collide I want to remove them (or mark them as needing to be removed, and remove them at the end of the time step). How would I accomplish this?

在更新功能中，我尝试

var bodyA = this.m_fixtureA.m_body;
...
bodyA.m_world.DestroyBody(bodyA);

但是，它们不会被删除。似乎当我尝试删除它们时，this.IsLocked（）设置为true。

However, they don't get deleted. It seems that when I am trying to delete them, this.IsLocked() is set to true.

推荐答案

如果world.IsLocked（）函数返回true，则世界不会删除实体。
而world.IsLocked（）将在世界迈出一步时返回true。
在步骤中删除正文可能会导致问题，因此在碰撞后销毁物体的正确方法是将它们注册到变量中，然后在步骤完成后销毁它们。

The world will not remove bodies if the world.IsLocked() function returns true. And world.IsLocked() will return true while the world is in a step. Removing a body during a step could cause issues, so the correct way of destroying bodies after collisions is to register them in a variable and then destroy them after the step is completed.

//Pseudo code:
var destroy_list = [];

// Your contact listener
var listener = function () {
  // Push the body you wish to destroy into an array
 destroy_list.push(body);
}

// The game interval function
var update = function () {
  // Destroy all bodies in destroy_list
  for (var i in destroy_list) {
    world.DestroyBody(destroy_list[i]);
  }
  // Reset the array
  destroy_list.length = 0;
}

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