jme学习笔记例13---创建地形
?本程序介绍JME的的地形实用工具类。您将学习如何使用ProceduralTextureGenerator，ImageBasedHeightMap，MidPointHeightMap和TerrainBlock对象。
这一切都将允许看毫不费力地创建地形。
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import com.jme.app.SimpleGame;import com.jme.terrain.TerrainBlock;import com.jme.terrain.util.MidPointHeightMap;import com.jme.terrain.util.ImageBasedHeightMap;import com.jme.terrain.util.ProceduralTextureGenerator;import com.jme.math.Vector3f;import com.jme.bounding.BoundingBox;import com.jme.scene.state.TextureState;import com.jme.util.TextureManager;import com.jme.image.Texture;import java.net.URL;import javax.swing.*;/*** Started Date: Aug 19, 2004<br><br>** This program introduces jME's terrain utility classes and how* they are used. It* goes over ProceduralTextureGenerator,* ImageBasedHeightMap, MidPointHeightMap, and* TerrainBlock.** @author Jack Lindamood*/public class HelloTerrain extends SimpleGame {public static void main(String[] args) {HelloTerrain app = new HelloTerrain();app.setDialogBehaviour(SimpleGame.ALWAYS_SHOW_PROPS_DIALOG);app.start();}protected void simpleInitGame() {// First a hand made terrainhomeGrownHeightMap();// Next an automatically generated terrain with a texturegeneratedHeightMap();// Finally a terrain loaded from a greyscale image with// fancy textures on it.complexTerrain();}private void homeGrownHeightMap() {// The map for our terrain. Each value is a height on the terrainint[] map=new int[]{1,2,3,4,892,1,2,3,3,2,1,2,4,3,2,1};// Create a terrain block. Our integer height values will// scale on the map 2x larger x,// and 2x larger z. Our map's origin will be the regular// origin, and it won't create an// AreaClodMesh from it.TerrainBlock tb=new TerrainBlock("block",4,new Vector3f(2,1,2),map,new Vector3f(0,0,0),false);// Give the terrain a bounding box.tb.setModelBound(new BoundingBox());tb.updateModelBound();// Attach the terrain TriMesh to our rootNoderootNode.attachChild(tb);}private void generatedHeightMap() {// This will be the texture for the terrain.URL grass=HelloTerrain.class.getClassLoader().getResource("jmetest/data/texture/grassb.png");// Use the helper class to create a terrain for us. The// terrain will be 64x64MidPointHeightMap mph=new MidPointHeightMap(64,1.5f);// Create a terrain block from the created terrain map.TerrainBlock tb=new TerrainBlock("midpoint block",mph.getSize(),new Vector3f(1,.11f,1),mph.getHeightMap(),new Vector3f(0,-25,0),false);// Add the textureTextureState ts=display.getRenderer().createTextureState();ts.setTexture(TextureManager.loadTexture(grass,Texture.MM_LINEAR,Texture.FM_LINEAR,true));tb.setRenderState(ts);// Give the terrain a bounding box.tb.setModelBound(new BoundingBox());tb.updateModelBound();// Attach the terrain TriMesh to rootNoderootNode.attachChild(tb);}private void complexTerrain() {// This grayscale image will be our terrainURL grayscale = HelloTerrain.class.getClassLoader(). getResource("jmetest/data/texture/bubble.jpg");// These will be the textures of our terrain.URL waterImage=HelloTerrain.class.getClassLoader().getResource("jmetest/data/texture/water.png");URL dirtImage=HelloTerrain.class.getClassLoader().getResource("jmetest/data/texture/dirt.jpg");URL highest=HelloTerrain.class.getClassLoader(). getResource("jmetest/data/texture/highest.jpg");// Create an image height map based on the gray scale of our image.ImageBasedHeightMap ib=new ImageBasedHeightMap( new ImageIcon(grayScale).getImage());// Create a terrain block from the image's grey scaleTerrainBlock tb=new TerrainBlock("image icon",ib.getSize(),new Vector3f(.5f,.05f,.5f),ib.getHeightMap(), new Vector3f(0,0,0),false); // Create an object to generate textured terrain from the// image based height map.ProceduralTextureGenerator pg=new ProceduralTextureGenerator(ib);// Look like water from height 0-60 with the strongest// "water look" at 30pg.addTexture(new ImageIcon(waterImage),0,30,60);// Look like dirt from height 40-120 with the strongest// "dirt look" at 80pg.addTexture(new ImageIcon(dirtImage),40,80,120); // Look like highest (pure white) from height 110-256// with the strongest "white look" at 130 pg.addTexture(new ImageIcon(highest),110,130,256);// Tell pg to create a texture from the ImageIcon's it has recieved.pg.createTexture(256);TextureState ts=display.getRenderer().createTextureState();// Load the texture and assign it.ts.setTexture(TextureManager.loadTexture(pg.getImageIcon().getImage(),Texture.MM_LINEAR_LINEAR,Texture.FM_LINEAR,true, true )); tb.setRenderState(ts);// Give the terrain a bounding box tb.setModelBound(new BoundingBox());tb.updateModelBound();// Move the terrain in front of the cameratb.setLocalTranslation(new Vector3f(0,0,-50));// Attach the terrain to our rootNode. rootNode.attachChild(tb); } }这个程序演示了jme的地形如何工作，所有的地形来自基类TerrainBlock。这个类也是一个TriMesh,此类用一个整数数组创建地形，这个程序创建了3个不同类型的地形，第一个始手工的，第2个使用工具创建，第3个是从某地形文件创建，我们开始第一个先// The map for our terrain. Each value is a height on the terrainint[] map=new int[]{1,2,3,4,2,1,2,3,3,2,1,2,4,3,2,1};// Create a terrain block. Our integer height values will// scale on the map 2x larger x,// and 2x larger z. Our map's origin will be the regular// origin, and it won't create an// AreaClodMesh from it.TerrainBlock tb=new TerrainBlock("block",4,new Vector3f(2,1,2),map,new Vector3f(0,0,0),false);这个地图数组就是整数值，每个整数代表一个高度这地形是一个正方形，如果你用map数组创建每个高度他看起来就是这样的，这就是在terrainblock如何生成的TerrainBlock第一个参数是地形块的名字（每个spatial对象必须有名字），接着块的尺寸是4*4.3rd是地形的scale值,我们定义了地形的整数值但如果我们要浮点的高度，scale值把地形沿x和z轴拉长了两倍。通过这个值可以控制地形的大小，最后两个参数是地形的原点（0，0，00如果我们要用areaclodmesh创建地形，地形将占用更大的内存可是会有更快的刷新率 下面，看这个地形的生成// Use the helper class to create a terrain for us. The// terrain will be 64x64MidPointHeightMap mph=new MidPointHeightMap(64,1.5f);// Create a terrain block from the created terrain map.TerrainBlock tb=new TerrainBlock("midpoint block",mph.getSize(),new Vector3f(1,.11f,1),mph.getHeightMap(),new Vector3f(0,-25,0),false);这里我们使用midpointheightmap去生成一个地形，地形是64*64的，我们给他的粗糙度是1.5,这个值让地形变得平滑，你可以把它设成你期望的效果，terrainblock对象从midpointheightmap中读取地形大小。 最后我们创建一个灰色图片的地形。你要注意地形图片的明暗度，imagebasedheightmap创建的地形从高到低由亮到暗，// Create an image height map based on the gray scale of our image.ImageBasedHeightMap ib=new ImageBasedHeightMap(new ImageIcon(grayScale).getImage() );我必须传递imagebasedheightmap一个图片对象，为此我创建imageicon获取url资源的图片，在height map和terrainblock创建之后，下一步是创建strange地形，首先，看这三个地形第一个是water，第2个是dirt最后一个是highest.jpg注意highest.jpg是相似白，现在另一个要关注的是复杂地形的尺寸// Create an object to generate textured terrain from the// image based height map.ProceduralTextureGenerator pg=new ProceduralTextureGenerator(ib);// Look like water from height 0-60 with the strongest// "water look" at 30pg.addTexture(new ImageIcon(waterImage),0,30,60);// Look like dirt from height 40-120 with the strongest// "dirt look" at 80pg.addTexture(new ImageIcon(dirtImage),40,80,120);// Look like highest (pure white) from height 110-256// with the strongest "white look" at 130pg.addTexture(new ImageIcon(highest),110,130,256);当我创建pd时传递它一个height map(实际height map对象不是int[]数组)，它使用height map创建纹理下面我传递3个图片给地形的3个部分，让我们看其中一个另外两个是同样的道理// Look like water from height 0-60 with the strongest// "water look" at 30pg.addTexture(new ImageIcon(waterImage),0,30,60);这个方法调用pg从高0-60存放water图片,water图片融合0-30之间，这个融合的最大强度是30，同样处理其他两个纹理，通知pg需要创建纹理// Tell pg to create a texture from the ImageIcon's it has recieved.pg.createTexture(256);你将注意当我创建纹理对象需要使用texturestate,我从pg获得textureTextureState ts=display.getRenderer().createTextureState();// Load the texture and assign it.ts.setTexture(TextureManager.loadTexture(pg.getImageIcon().getImage(),Texture.MM_LINEAR_LINEAR,Texture.FM_LINEAR,true,true));全部的工作完成了，一个terrain类创建地形并把它拆分到不同的约束盒所以你看不到地形被包裹?