从box2d.world.getParticlePositionBuffer（）中删除粒子

Question

如何在屏幕离开时从box2d.world中删除粒子？

目前，我的代码来自Nature of Code - LiquidFunTest示例：

Vec2[] positionBuffer = box2d.world.getParticlePositionBuffer();
if (positionBuffer != null) {
  for (int i = 0; i < positionBuffer.length; i++) {
    Vec2 pos = box2d.coordWorldToPixels(positionBuffer[i]);
    pg.stroke(255);
    pg.strokeWeight(3);
    pg.point(pos.x, pos.y);
  }
}

我已将代码更改为：

Vec2[] positionBuffer = box2d.world.getParticlePositionBuffer();
if (positionBuffer != null) {

  for (int i = 0; i < positionBuffer.length; i++) {
    Vec2 pos = box2d.coordWorldToPixels(positionBuffer[i]);
    if(pos.y > height){
      box2d.world.destroyParticle(i);
    } else {
      pg.stroke(255);
      pg.strokeWeight(3);
      pg.point(pos.x, pos.y);
    }
  }
}

但destroyParticle()方法与getParticlePositionBuffer()

的索引不同