Question

var drawAreaAction;
var drawBuild = function(){
    //设置控件的当前操作为面积量算
    var measureAreaAction = new SuperMap.Web.UI.Action3Ds.MeasureArea(sceneControl);
    sceneControl.set_sceneAction(measureAreaAction);
    //给面积量算事件和量算结束事件注册回调函数
    sceneControl.addEvent("measureAreaFinished", drawFinish);
};

var drawFinish = function(dArea, line3D){
    //量算结束后显示总的面积信息
    
    var geoRegion = new SuperMap.Web.Core.GeoRegion3D();
    var points = new SuperMap.Web.Core.Point3Ds();
    for (var i = 0; i < line3D.get_partCount() ; i++) {
        var point3Ds = line3D.getPart(i);
        for (var j = 0; j < point3Ds.get_count() ; j++) {
            var point3D = point3Ds.get_item(j);
            points.add(point3D);
            var geoPoint = new SuperMap.Web.Core.GeoPoint3D(point3D);
            var feature3D = new SuperMap.Web.Core.Feature3D();
            var style3D = new SuperMap.Web.Core.Style3D();
            feature3D.set_geometry(geoPoint);
            //定义节点颜色
            style3D.set_markerColor(new SuperMap.Web.Core.Color(255, 0, 255, 225));
            style3D.set_markerScale(5);
            feature3D.set_style3D(style3D);
            scene.get_trackingLayer3D().add(feature3D, 'p');
        }
        
    }
    geoRegion.addPart(points);
    
    var feature3d = new SuperMap.Web.Core.Feature3D();
    feature3d.set_geometry(geoRegion);
    
    var style3d = new SuperMap.Web.Core.Style3D();
     
    feature3d.set_style3D(style3d);
    //设置跟踪图层可见
    scene.get_trackingLayer3D().set_isVisible(true);
    //将feature3D加入跟踪图层
    scene.get_trackingLayer3D().add(feature3d, "p1");
    lashenModal();
};

function lashenModal(){
    var feature = scene.get_trackingLayer3D().get_item("p1");
    var style3d = feature.get_style3D();
    style3d.set_fillForeColor(new SuperMap.Web.Core.Color(255, 255, 0, 255));              
    style3d.set_altitudeMode(SuperMap.Web.Realspace.AltitudeMode.RELATIVE_TO_GROUND);
    style3d.set_extendHeight(100000);
    style3d.set_bottomAltitude(5000);
    feature.set_style3D(style3d);     
    scene.get_trackingLayer3D().refresh();
};

用这个代码画出来的图形拉伸之后没有出现拉伸的效果，而且图形消失