修改模型高度

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>修改模型高度</title>
        <link href="./css/widgets.css" rel="stylesheet">
        <link href="./css/bootstrap.min.css" rel="stylesheet">
        <link href="./css/pretty.css" rel="stylesheet">
        <script src="./js/jquery.min.js"></script>
        <script src="./js/bootstrap.min.js"></script>
        <script src="./js/bootstrap-select.min.js"></script>
        <script src="./js/require.min.js" data-main="js/main"></script>
        <script src="./js/config.js"></script>
    </head>
    <body>
        
        <div id="container" style="width: 100%; height: 100%;"></div>
        
        <script>
        
            function onload(Cesium) {
                
                var viewer = new Cesium.Viewer('container');
                var myurl = "http://localhost:8090/"
                
                viewer.imageryLayers.addImageryProvider(new Cesium.TiandituImageryProvider({
                    token: URL_CONFIG.TOKEN_TIANDITU
                }));
                
                viewer.imageryLayers.addImageryProvider(new Cesium.TiandituImageryProvider({
                    mapStyle : Cesium.TiandituMapsStyle.CIA_C,
                    token: URL_CONFIG.TOKEN_TIANDITU
                }));
            
                var scene = viewer.scene;
                var widget = viewer.cesiumWidget;
                
                try {
                    
                    var promise = scene.open(myurl + "iserver/services/3D-xxx/rest/realspace");
                   
                    Cesium.when(promise,function(layers){
                       
                       ''' 修改模型高度 '''
                       for(var i=0; i < layers.length; i++){
                            var style3D = new Cesium.Style3D();
                            ''' 可调节此数值，然后依次查看是否合适'''
                            style3D.bottomAltitude = -100;
                            layers[i].style3D = style3D;
                            layers[i].refresh();
                        };
                        
                        scene.camera.setView({
                            destination: 
                                new Cesium.Cartesian3.fromDegrees(x, y, z), 
                        });
                            
                }, 
                function(e){
                    if (widget._showRenderLoopErrors) {
                        var title = '加载SCP失败，请检查网络连接状态或者url地址是否正确？';
                        widget.showErrorPanel(title, undefined, e);
                    }
                });
                }
                catch(e){
                    if (widget._showRenderLoopErrors) {
                        var title = '渲染时发生错误，已停止渲染。';
                        widget.showErrorPanel(title, undefined, e);
                    }
                };
            
            };
      
        </script>
            
    </body>
</html>