【解决办法】参考代码：
//监听场景打开
Application.getActiveApplication().getMainFrame().getFormManager().addFormShownListener(new FormShownListener() {
@Override
public void formShown(FormShownEvent formShownEvent) {
System.out.println("++++++++++++++++++++++++");
System.out.println(formShownEvent.getForm().getWindowType().getName());
if("ELLIPSOIDSCENE".equals(formShownEvent.getForm().getWindowType().getName())){
System.out.println(((IFormScene)formShownEvent.getForm()).getLayer3Ds());
}else {
}
System.out.println("++++++++++++++++++++++++");
}
});
