Question

private void initialize() {
		try {
			
//			WorkspaceConnectionInfo conInfo = new WorkspaceConnectionInfo("../../SampleData/OlympicGreenSCV/OlympicGreen.sxwu");
			WorkspaceConnectionInfo conInfo = new WorkspaceConnectionInfo("E:\\test\\cloud_zb_1.smwu");
            conInfo.setType(WorkspaceType.SMWU);
            m_workspace.open(conInfo);

            m_sceneControl.getScene().setWorkspace(m_workspace);

//            m_sceneControl.getScene().open("OlympicGreen");
            m_sceneControl.getScene().open("cloud_zb");
			
			m_sceneControl.getScene().setCrossVisible(false);

//			Layer3D olympicGreenLayer = m_sceneControl.getScene().getLayers().get("Ground@OlympicGreen");
			Layer3D olympicGreenLayer = m_sceneControl.getScene().getLayers().get("cloud_zb");
            m_sceneControl.getScene().ensureVisible(olympicGreenLayer.getBounds(), 1000);
	        
	        for(int i= 0;i<m_sceneControl.getScene().getLayers().getCount();i++)
	        {
	        	Layer3D layer = m_sceneControl.getScene().getLayers().get(i);
	        	layer.setSelectable(false);
	        }
	        //============构造圆柱体start============
	        // 构造  GeoCylinder 对象
	        GeoCylinder geoBox = new GeoCylinder();
            // 设置圆柱体的上下底面的半径
            geoBox.setBottomRadius(5);
            geoBox.setTopRadius(5);
            // 设置圆柱体的高度
            geoBox.setHeight(50);
            // 设置圆柱体所在的位置
            geoBox.setPosition(new Point3D(4.831761,36.217446,0));
            //设置圆柱的颜色和透明度
            GeoStyle3D style = new GeoStyle3D();
            style.setFillForeColor(new Color(255, 255, 255, 100));
            geoBox.setStyle3D(style);
            // 返回按 GeoModel 的方式重新构建的模型对象
            GeoModel geoModel = geoBox.getGeoModel(100, 100);
            // 向跟踪图层上添加圆柱体
            m_sceneControl.getScene().getTrackingLayer().add(geoModel, "geoBox");
            // 飞行定位到该圆柱体对象
//            m_sceneControl.getScene().fly(geoModel, FlyingMode.FLYINGTO);
	        //===========结束==================
            
            //===========根据起始点，方位角，距离计算终止点
            GlobalCoordinates startPoint = new GlobalCoordinates(36.217446, 4.831761);
            GeodeticCalculator cal = new GeodeticCalculator();
            GlobalCoordinates endPoint = cal.calculateEndingGlobalCoordinates(Ellipsoid.WGS84, startPoint, 0, 5);
            System.out.println(endPoint);
            //===========end========
            
            //=======在终止点处画一个点
            GeoPoint3D geoPoint3D = new GeoPoint3D(endPoint.getLongitude(), endPoint.getLatitude(), 5);
            GeoStyle3D style2 = new GeoStyle3D();
            style2.setAltitudeMode(AltitudeMode.ABSOLUTE);
            style2.setMarkerColor(Color.BLUE);
            style2.setMarkerSize(10);
            geoPoint3D.setStyle3D(style2);
            m_sceneControl.getScene().getTrackingLayer().set(0, geoPoint3D);
            //========end=========
            
             m_point3Ds = new Point3Ds();
             m_point3DsAll = new Point3Ds();
             m_geoLine3D = new GeoLine3D();
             m_geoLine3D.setStyle3D(setLineGeoStyle3D());
             m_pointName = "Point";
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		}
	}

如上，如果不画三维点，圆柱体能显示，可是加上画三维点的代码，运行以后就只能显示三维点了，圆柱看不见，这是什么原因呢。

Answer 1

m_sceneControl.getScene().getTrackingLayer().set(0, geoPoint3D);

你添加点的时候用的是set的方法，set表示替换跟踪图层中对应索引的对象，所以当然就看不见圆柱了，因为圆柱已经被替换到了，用add添加