World Wind Java开发之十五——加载三维模型（转）

之前的一篇博客是关于加载粗三维模型的，见http://blog.csdn.net/giser_whu/article/details/43452703，这个地方还存在着不能加载纹理的问题，一直没呢解决。那么WW如何加载常用的三维模型格式（3ds、obj、skp）呢，通过一番搜索，了解到WW可以加载collada的dae格式的三维模型，并且还可以加载kml\kmz文件，那么WW加载三维模型的方法就出来了：首先将其他格式三维模型转换为kmz或kml文件，再加载。这里我是从su的三维模型库中下载的skp文件，在su中可以直接转换为kmz文件，通过测试，这个方法是可行的。先来看下效果图：

1.效果图

第一幅是德国标志性建筑——柏林奥林匹克体育场，可以看到效果还是可以的，不过没有使用lod技术，一旦模型数量增多，会卡顿。

 

第二幅是也是德国地标性建筑——柏林电视塔。

 

第三幅是3D City DB上的德国柏林一些collada三维模型，需要的可以去下载做下测试

2.实现方法

开头已经明确了WW加载三维模型的路线，WW又提供了加载kml/kmz文件的demo（KMLViewer），所以要实现这个是很简单的了，只需根据自己的需要改动原demo，整合到自己的工程下即可，这里我改动原demo，编写了SmartScopeKMLViewer，方法参见之前的博客。所用到的数据，整理完上传到CSDN资源，需要的可以去下载。下载地址：http://download.csdn.net/detail/liushuo_whu/8512739

3.源代码

/*
Copyright (C) 2001, 2010 United States Government
as represented by the Administrator of the
National Aeronautics and Space Administration.
All Rights Reserved.
 */

package gov.nasa.worldwindx.examples.kml;

import gov.nasa.worldwind.WorldWind;
import gov.nasa.worldwind.avlist.AVKey;
import gov.nasa.worldwind.awt.WorldWindowGLCanvas;
import gov.nasa.worldwind.layers.RenderableLayer;
import gov.nasa.worldwind.ogc.kml.KMLAbstractFeature;
import gov.nasa.worldwind.ogc.kml.KMLRoot;
import gov.nasa.worldwind.ogc.kml.impl.KMLController;
import gov.nasa.worldwind.render.Offset;
import gov.nasa.worldwind.retrieve.RetrievalService;
import gov.nasa.worldwind.util.WWIO;
import gov.nasa.worldwind.util.WWUtil;
import gov.nasa.worldwind.util.layertree.KMLLayerTreeNode;
import gov.nasa.worldwind.util.layertree.KMLNetworkLinkTreeNode;
import gov.nasa.worldwind.util.layertree.LayerTree;
import gov.nasa.worldwindx.examples.util.BalloonController;
import gov.nasa.worldwindx.examples.util.HotSpotController;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.IOException;
import java.net.URL;

import javax.swing.SwingUtilities;
import javax.xml.stream.XMLStreamException;

/**
 * 导入KML或KMZ文件，以图层形式查看，KML或KMZ文件的内容显示为一个要素树。在要素树上点击KML要素可以查看该要素
 * ，在球上点击要素可以弹出要素的描述信息框
 */
public class SmartScopeKMLViewer
{
    public static class KMLUtil
    {
        protected LayerTree layerTree; // 图层树
        protected RenderableLayer hiddenLayer; // 渲染图层（图层树）

        protected HotSpotController hotSpotController; // 热点controller
        protected KMLApplicationController kmlAppController; // KMLcontroller
        protected BalloonController balloonController; // BalloonController
        protected WorldWindowGLCanvas wwd; // ww

        public KMLUtil(WorldWindowGLCanvas worldWindowGLCanvas)
        {
            this.wwd = worldWindowGLCanvas;
            // 初始化图层树
            this.layerTree = new LayerTree(new Offset(20d, 160d, AVKey.PIXELS,
                    AVKey.INSET_PIXELS));
            // this.layerTree.getModel().refresh(this.wwd.getModel().getLayers());

            // 图层树渲染图层
            this.hiddenLayer = new RenderableLayer();
            this.hiddenLayer.addRenderable(this.layerTree);
            this.wwd.getModel().getLayers().add(this.hiddenLayer);

            // 注册图层选择和气球热点选择事件监听
            this.hotSpotController = new HotSpotController(this.wwd);
            // 注册kml事件监听
            this.kmlAppController = new KMLApplicationController(this.wwd);

            this.balloonController = new BalloonController(this.wwd)
            {
                @Override
                protected void addDocumentLayer(KMLRoot document)
                {
                    addKMLLayer(document);
                }
            };

            // 关联kml管理器和balloon管理器
            this.kmlAppController.setBalloonController(balloonController);

            // Set up to receive SSLHandshakeExceptions that occur during
            // resource retrieval.
            WorldWind.getRetrievalService().setSSLExceptionListener(
                    new RetrievalService.SSLExceptionListener()
                    {
                        public void onException(Throwable e, String path)
                        {
                            System.out.println(path);
                            System.out.println(e);
                        }
                    });
        }

        /**
         *
         * @方法名称: addKMLLayer ；
         * @方法描述: 添加KML图层： ；
         * @参数 ：@param kmlRoot
         * @返回类型: void ；
         * @创建人：bluce ;
         * @创建时间：2015年3月17日 下午7:54:40；
         * @throws
         */
        protected void addKMLLayer(KMLRoot kmlRoot)
        {
            // Create a KMLController to adapt the KMLRoot to the World Wind
            KMLController kmlController = new KMLController(kmlRoot);

            // 添加kml图层
            RenderableLayer layer = new RenderableLayer();
            layer.setName((String) kmlRoot.getField(AVKey.DISPLAY_NAME));
            layer.addRenderable(kmlController);
            this.wwd.getModel().getLayers().add(layer);

            // 添加kml图层树节点
            KMLLayerTreeNode layerNode = new KMLLayerTreeNode(layer, kmlRoot);
            this.layerTree.getModel().addLayer(layerNode);
            this.layerTree.makeVisible(layerNode.getPath());
            layerNode.expandOpenContainers(this.layerTree);

            // Listens to refresh property change events from KML network link
            // nodes. Upon receiving such an event this
            // expands any tree paths that represent open KML containers. When a
            // KML network link refreshes, its tree
            // node replaces its children with new nodes created from the
            // refreshed content, then sends a refresh
            // property change event through the layer tree. By expanding open
            // containers after a network link refresh,
            // we ensure that the network link tree view appearance is
            // consistent with the KML specification.
            layerNode.addPropertyChangeListener(
                    AVKey.RETRIEVAL_STATE_SUCCESSFUL,
                    new PropertyChangeListener()
                    {
                        public void propertyChange(
                                final PropertyChangeEvent event)
                        {
                            if (event.getSource() instanceof KMLNetworkLinkTreeNode)
                            {
                                // Manipulate the tree on the EDT.
                                SwingUtilities.invokeLater(new Runnable()
                                {
                                    public void run()
                                    {
                                        ((KMLNetworkLinkTreeNode) event
                                                .getSource())
                                                .expandOpenContainers(layerTree);
                                        wwd.redraw();
                                    }
                                });
                            }
                        }
                    });
        }
    }

    /**
     *
     * @项目名称：worldwind-1.5.0
     * @类名称：WorkerThread
     * @类描述：加载KML文件线程类
     * @创建人：bluce
     * @创建时间：2015年3月17日 下午7:58:38
     * @修改备注：
     * @版本：
     */
    public static class WorkerThread extends Thread
    {
        /**
         * 待加载kml文件，在构造函数中初始化
         */
        protected Object kmlSource;
        /**
         * kmlapp
         */
        protected KMLUtil KMLUtil;

        public WorkerThread(Object kmlSource, KMLUtil KMLUtil)
        {
            this.kmlSource = kmlSource;
            this.KMLUtil = KMLUtil;
        }

        /**
         * Loads this worker thread's KML source into a new
         * <code>{@link gov.nasa.worldwind.ogc.kml.KMLRoot}</code>, then adds
         * the new <code>KMLRoot</code> to this worker thread's
         * <code>AppFrame</code>. The <code>KMLRoot</code>'s
         * <code>AVKey.DISPLAY_NAME</code> field contains a display name created
         * from either the KML source or the KML root feature name.
         * <p/>
         * If loading the KML source fails, this prints the exception and its
         * stack trace to the standard error stream, but otherwise does nothing.
         */
        public void run()
        {
            try
            {
                KMLRoot kmlRoot = this.parse();
                // 设置文档的显示名称
                kmlRoot.setField(AVKey.DISPLAY_NAME,
                        formName(this.kmlSource, kmlRoot));

                // 启动一个任务进程加载解析的kml文件
                final KMLRoot finalKMLRoot = kmlRoot;
                SwingUtilities.invokeLater(new Runnable()
                {
                    public void run()
                    {
                        KMLUtil.addKMLLayer(finalKMLRoot);
                    }
                });
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }

        /**
         *
         * @方法名称: parse ；
         * @方法描述: 解析KML文档 ；
         * @参数 ：@return 返回KMLRoot
         * @参数 ：@throws IOException：文档不可读
         * @参数 ：@throws XMLStreamException ：文档解析出现错误
         * @返回类型: KMLRoot ；
         * @创建人：bluce  ;
         * @创建时间：2015年3月17日 下午8:02:59；
         * @throws
         */
        protected KMLRoot parse() throws IOException, XMLStreamException
        {
            // KMLRoot.createAndParse will attempt to parse the document using a
            // namespace aware parser, but if that
            // fails due to a parsing error it will try again using a namespace
            // unaware parser. Note that this second
            // step may require the document to be read from the network again
            // if the kmlSource is a stream.
            return KMLRoot.createAndParse(this.kmlSource);
        }
    }

    protected static String formName(Object kmlSource, KMLRoot kmlRoot)
    {
        KMLAbstractFeature rootFeature = kmlRoot.getFeature();

        if (rootFeature != null && !WWUtil.isEmpty(rootFeature.getName()))
            return rootFeature.getName();

        if (kmlSource instanceof File)
            return ((File) kmlSource).getName();

        if (kmlSource instanceof URL)
            return ((URL) kmlSource).getPath();

        if (kmlSource instanceof String
                && WWIO.makeURL((String) kmlSource) != null)
            return WWIO.makeURL((String) kmlSource).getPath();

        return "KML Layer";
    }

}