调用Forge中RCDB的PointCloudMarkUp绘制出来的标记不是动态的

Question

我因为不需要面板，所以我只引用了FCDB中的PointCloudMarkUp部分，想要用来绘制动态的标记，但是绘制出来的标记确实静态的，请问是哪里出错了吗？
var hitTest = viewer.clientToWorld(event.canvasX, event.canvasY, true);

                            const markupInfo = {
                                fragId: hitTest.fragId,
                                point: hitTest.point,
                                dbId: hitTest.dbId,
                                size: 40
                            }
                           var markup = new pointcloudmarkup(viewer, options);
                            markup.addMarkup(markupInfo);
                            markup.startAnimation();                            
                            ![图片描述][1]

Answer 1

找到原因了，缺少动画部分 `              

Answer 2

 const loop = (t) => {                                    window.requestAnimationFrame(loop)                                    this.markup.update(0.0);                                 };                                loop(0.0);                             }                             `