去除球体

Question

我最终设法使我的程序检测到我用Java-3D创建的两个球之间的碰撞；玩家球和敌人球。现在的问题是，我不知道如何在玩家球与敌方球碰撞时将其移走。我尝试过一些简单的操作，例如objTrans.removeChild(sphere);和objRoot.removeChild(objTrans);（objTrans是我的TransformGroup，而objRoot是我的BranchGroup），在两种情况下，我都会收到此错误消息

Exception in thread "AWT-EventQueue-0" javax.media.j3d.RestrictedAccessException: Group: only a BranchGroup node may be removed

我也尝试过objRoot.detach();，但随后收到错误消息：

Exception in thread "AWT-EventQueue-0" javax.media.j3d.CapabilityNotSetException: BranchGroup: no capability to detach

我不知道有什么其他方法可以去除球。请帮助。

Answer 1

Answer 2

private BranchGroup             mapGroup = null;

public void updateModel (....)
{
    Shape3D                 shape;

    // Update 3D primitives
    if (mapGroup != null)                       // remove previous 3D model
        object.removeChild (mapGroup);      

    shape = facesTexturedShape (....);
    if (shape != null)                          // add new 3D model if non-null
    {
        mapGroup = new BranchGroup ();
        mapGroup.setCapability (BranchGroup.ALLOW_DETACH);
        mapGroup.addChild (shape);

        object.addChild (mapGroup);         
    }
}