World Wind Java开发之十五——加载三维模型

ゝ一纸荒年。 2022-08-07 06:38 219阅读 0赞

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][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。

![Center][]

第二幅是也是德国地标性建筑——柏林电视塔。

![Center 1][]

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

![Center 2][]

## 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][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";
    	}
    
    }

[http_blog.csdn.net_giser_whu_article_details_43452703]: http://blog.csdn.net/giser_whu/article/details/43452703
[Center]: /images/20220805/56f3045ea86f4a899ffec8846138fb25.png
[Center 1]: /images/20220805/38c22dbf952f4b4c915a2c4858d0ceba.png
[3D City DB]: http://www.3dcitydb.net/3dcitydb/welcome/
[Center 2]: /images/20220805/f272f37c2be94526885b7f8823b15b09.png
[http_download.csdn.net_detail_liushuo_whu_8512739]: http://download.csdn.net/detail/liushuo_whu/8512739