OBJ文件是Alias|Wavefront公司为它的一套基于工作站的3D建模和动画软件"Advanced Visualizer"开发的一种标准3D模型文件格式，很适合用于3D软件模型之间的互导，也可以通过Maya读写。比如你在3dsMax或LightWave中建了一个模型，想把它调到Maya里面渲染或动画，导出OBJ文件就是一种很好的选择。目前几乎所有知名的3D软件都支持OBJ文件的读写，不过其中很多需要通过插件才能实现。Java3D内置了OBJ文件的相关操作.
实例比较简单,制作的效果是模型加载后绕Y轴旋转.我们可以通过模型动态展示观察3D效果
OBJ文件读取工具类代码如下:[在使用前别忘了添加Java3D驱动包,这块信息可以看这篇: http://www.cnblogs.com/dennisit/archive/2013/05/06/3063042.html ]
废话不多说,直接上代码,说明见代码注释
实例一：加载obj文件到场景
package com.java3d.dennist.loader; import javax.media.j3d.BranchGroup; import com.sun.j3d.loaders.Scene; import com.sun.j3d.loaders.objectfile.ObjectFile; /** * * * @version ： 1.1 * * @author ： 苏若年 <a href="mailto:[email protected]">发送邮件</a> * * @since ： 1.0 创建时间: 2013-5-7 下午02:13:43 * * TODO : Java3D读取OBJ文件 * */ public class ObjFileReader extends BranchGroup{ private double creaseAngle = 60.0; /** * * 读取ObjModel文件 * * @param filePath obj文件路径 * */ public ObjFileReader(String filePath){ BranchGroup branchGroup = new BranchGroup(); int flags = ObjectFile.RESIZE; ObjectFile objFile = new ObjectFile(flags, (float)(creaseAngle*Math.PI)/180); Scene scenen = null; try { scenen = objFile.load(filePath); } catch (Exception e) { e.printStackTrace(); System.out.println("OBJ模型加载失败" + e.getMessage()); } branchGroup.addChild(scenen.getSceneGroup()); this.addChild(branchGroup); } }
Java加载OBJ模型到应用场景
package com.java3d.dennist.loader; import java.applet.Applet; import java.awt.BorderLayout; import javax.media.j3d.Alpha; import javax.media.j3d.Background; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.DirectionalLight; import javax.media.j3d.RotationInterpolator; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Vector3f; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.universe.SimpleUniverse; /** * * * @version ： 1.1 * * @author ： 苏若年 <a href="mailto:[email protected]">发送邮件</a> * * @since ： 1.0 创建时间: 2013-5-7 下午02:21:18 * * TODO : Java3D 实例 OBJ模型加载 展示 * */ public class JavaModelObjLoaderApp extends Applet{ /** * */ private static final long serialVersionUID = 5841679659336190804L; public BranchGroup createSceneGraph(){ // 创建场景图分支 BranchGroup group = new BranchGroup(); // 几何变换组节点 TransformGroup transGroup = new TransformGroup(); // 几何变换 Transform3D trans3d = new Transform3D(); // 缩放变换 trans3d.setScale(0.8); //将几何变换节点对象添加到节点组 transGroup.setTransform(trans3d); //将几何变化组添加到场景 group.addChild(transGroup); // 球体作用范围边界对象 BoundingSphere bound= new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0); Color3f bgColor = new Color3f(0.05f,0.05f,0.2f); Background bg = new Background(bgColor); bg.setApplicationBounds(bound); group.addChild(bg); // 设置光源 Color3f lightColor = new Color3f(1.0f,1.0f,0.9f); Vector3f lightDirection = new Vector3f(4.0f,-7.0f,-12.0f); //设置定向光的颜色和影响范围 DirectionalLight light = new DirectionalLight(lightColor, lightDirection); light.setInfluencingBounds(bound); //将光源添加到场景 group.addChild(light); //几何变换组节点 - 加载外部模型 TransformGroup objTrans = new TransformGroup(); objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); //加载Obj格式的模型文件 objTrans.addChild(new ObjFileReader("F:/guanyu.obj")); //将模型添加到变换组节点 transGroup.addChild(objTrans); //设置几何变化,绕Y轴中心旋转 Transform3D yAxis = new Transform3D(); Alpha rotationAlpha = new Alpha(-1,Alpha.INCREASING_ENABLE, 0,0, 4000,0,0, 0,0,0); RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, objTrans,yAxis,0.0f,(float)Math.PI*2.0f); rotator.setSchedulingBounds(bound); objTrans.addChild(rotator); group.compile(); return group; } public JavaModelObjLoaderApp(){ setLayout(new BorderLayout()); // 创建3D场景绘制画布Canvas3D对象 Canvas3D canvas = new Canvas3D(null); add("Center",canvas); BranchGroup scene = createSceneGraph(); SimpleUniverse universe = new SimpleUniverse(canvas); universe.getViewingPlatform().setNominalViewingTransform(); universe.addBranchGraph(scene); } public static void main(String[] args) { new MainFrame(new JavaModelObjLoaderApp(), 360,360); } }
实例二：实现场景中多个模型
效果图:
<!--EndFragment-->实例代码:
package com.java3d.dennist.loader; import java.applet.Applet; import java.awt.BorderLayout; import javax.media.j3d.Alpha; import javax.media.j3d.Background; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.DirectionalLight; import javax.media.j3d.Group; import javax.media.j3d.RotationInterpolator; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Vector3d; import javax.vecmath.Vector3f; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.universe.SimpleUniverse; import com.sun.j3d.utils.universe.ViewingPlatform; /** * * * @version ： 1.1 * * @author ： 苏若年 <a href="mailto:[email protected]">发送邮件</a> * * @since ： 1.0 创建时间: 2013-5-7 下午03:46:59 * * TODO : * */ public class JavaModelObjMultiLoaderApp extends Applet{ /** * */ private static final long serialVersionUID = 3645520149291184985L; public BranchGroup createSceneGraph(){ // 创建场景图分支 BranchGroup group = new BranchGroup(); // 几何变换组节点 TransformGroup transGroup = new TransformGroup(); // 几何变换 Transform3D trans3d = new Transform3D(); // 缩放变换 trans3d.setScale(0.8); //将几何变换节点对象添加到节点组 transGroup.setTransform(trans3d); //将几何变化组添加到场景 group.addChild(transGroup); // 球体作用范围边界对象 BoundingSphere bound= new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0); Color3f bgColor = new Color3f(0.05f,0.05f,0.2f); Background bg = new Background(bgColor); bg.setApplicationBounds(bound); group.addChild(bg); // 设置光源 Color3f lightColor = new Color3f(1.0f,1.0f,0.9f); Vector3f lightDirection = new Vector3f(4.0f,-7.0f,-12.0f); //设置定向光的颜色和影响范围 DirectionalLight light = new DirectionalLight(lightColor, lightDirection); light.setInfluencingBounds(bound); //将光源添加到场景 group.addChild(light); BranchGroup branchGroup1 = new ObjFileReader("F:/guanyu.obj"); BranchGroup branchGroup2 = new ObjFileReader("F:/guanyu.obj"); group.addChild(createObject(branchGroup1,bound, -1.3f, 0.0f, 0.0f,3000)); group.addChild(createObject(branchGroup2,bound, 1.3f, 0.0f, 0.0f ,4000)); group.compile(); return group; } /** * * Description: 创建模型行为 绕Y轴旋转 * @param group 模型结点 * @param bound 模型作用范围边界 * @param xpos 模型展示左边X轴位置 * @param ypos 模型展示左边y轴位置 * @param zpos 模型展示左边z轴位置 * @param time 模型转动速度 * @return */ private Group createObject(BranchGroup group,BoundingSphere bound, float xpos, float ypos,float zpos, int time){ Transform3D trans3d = new Transform3D(); trans3d.setTranslation(new Vector3f(xpos, ypos, zpos)); TransformGroup objTrans = new TransformGroup(trans3d); TransformGroup sgroup = new TransformGroup(); sgroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); sgroup.addChild(group); //设置几何变化,绕Y轴中心旋转 Transform3D yAxis = new Transform3D(); Alpha rotationAlpha = new Alpha(-1,Alpha.INCREASING_ENABLE, 0,0, time,0,0, 0,0,0); RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, sgroup,yAxis,0.0f,(float)Math.PI*2.0f); rotator.setSchedulingBounds(bound); objTrans.addChild(rotator); objTrans.addChild(sgroup); return objTrans; } public JavaModelObjMultiLoaderApp(){ setLayout(new BorderLayout()); // 创建3D场景绘制画布Canvas3D对象 Canvas3D canvas = new Canvas3D(null); add("Center",canvas); BranchGroup scene = createSceneGraph(); SimpleUniverse universe = new SimpleUniverse(canvas); //设定用户视角 Point3d userPosition = new Point3d(0,3,6); initUserPosition(universe,userPosition); //universe.getViewingPlatform().setNominalViewingTransform(); universe.addBranchGraph(scene); } //初始化用户视角 private void initUserPosition(SimpleUniverse universe,Point3d userPosition){ ViewingPlatform vp = universe.getViewingPlatform(); TransformGroup steerTG = vp.getViewPlatformTransform(); Transform3D t3d = new Transform3D(); steerTG.getTransform(t3d); t3d.lookAt(userPosition, new Point3d(0,0,0), new Vector3d(0,1,0)); t3d.invert(); steerTG.setTransform(t3d); } public static void main(String[] args) { new MainFrame(new JavaModelObjMultiLoaderApp(), 350,210); } }
实例二:模型行为变换 实现鼠标触控360度空间旋转
package com.java3d.dennist.loader; import java.applet.Applet; import java.awt.BorderLayout; import javax.media.j3d.Background; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.DirectionalLight; import javax.media.j3d.Transform3D; import javax.media.j3d.TransformGroup; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Vector3f; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.behaviors.mouse.MouseRotate; import com.sun.j3d.utils.behaviors.mouse.MouseTranslate; import com.sun.j3d.utils.behaviors.mouse.MouseWheelZoom; import com.sun.j3d.utils.universe.SimpleUniverse; /** * * * @version ： 1.1 * * @author ： 苏若年 <a href="mailto:[email protected]">发送邮件</a> * * @since ： 1.0 创建时间: 2013-5-7 下午02:21:18 * * TODO : Java3D 实例 OBJ模型加载 展示,360度空间旋转 * */ public class JavaModelObjLoader extends Applet { /** * */ private static final long serialVersionUID = 5841679659336190804L; public BranchGroup createSceneGraph() { // 创建场景图分支 BranchGroup group = new BranchGroup(); // 几何变换组节点 TransformGroup transGroup = new TransformGroup(); // 几何变换 Transform3D trans3d = new Transform3D(); // 缩放变换 trans3d.setScale(0.8); // 将几何变换节点对象添加到节点组 transGroup.setTransform(trans3d); // 将几何变化组添加到场景 group.addChild(transGroup); // 球体作用范围边界对象 BoundingSphere bound = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); Color3f bgColor = new Color3f(0.05f, 0.05f, 0.2f); Background bg = new Background(bgColor); bg.setApplicationBounds(bound); group.addChild(bg); // 设置光源 Color3f lightColor = new Color3f(1.0f, 1.0f, 0.9f); Vector3f lightDirection = new Vector3f(4.0f, -7.0f, -12.0f); // 设置定向光的颜色和影响范围 DirectionalLight light = new DirectionalLight(lightColor, lightDirection); light.setInfluencingBounds(bound); // 将光源添加到场景 group.addChild(light); // 几何变换组节点 - 加载外部模型 TransformGroup objTrans = new TransformGroup(); objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); // 加载Obj格式的模型文件 objTrans.addChild(new ObjFileReader("F:/a.obj")); // 将模型添加到变换组节点 transGroup.addChild(objTrans); // 设置模型行为,鼠标触控360度空间旋转 MouseRotate behavior = new MouseRotate(); behavior.setTransformGroup(objTrans); objTrans.addChild(behavior); behavior.setSchedulingBounds(bound); MouseTranslate tr = new MouseTranslate(); tr.setTransformGroup(objTrans); objTrans.addChild(tr); tr.setSchedulingBounds(bound); MouseWheelZoom tr1 = new MouseWheelZoom(); tr1.setTransformGroup(objTrans); objTrans.addChild(tr1); tr1.setSchedulingBounds(bound); group.compile(); return group; } public JavaModelObjLoader() { setLayout(new BorderLayout()); // 创建3D场景绘制画布Canvas3D对象 Canvas3D canvas = new Canvas3D(null); add("Center", canvas); BranchGroup scene = createSceneGraph(); SimpleUniverse universe = new SimpleUniverse(canvas); universe.getViewingPlatform().setNominalViewingTransform(); universe.addBranchGraph(scene); } public static void main(String[] args) { new MainFrame(new JavaModelObjLoader(), 360, 360); } }
说明:
sun公司的Java3D市场当年没有火起来,最近要用才开始找资料学习,不然 哎！！哪来心思整这玩意儿, 网上搜了下 都是学院派的东东,什么毕业设计啦 什么虚拟校园的啦 老生长谈 , 看来学院派真的很out了, 老跟不上技术发展 用这没人用的东西! 小小抱怨一下, 自己学习整理一下 以备后来者被逼用过时技术的时候直接copy, 省出些时间,泡妹纸的泡妹纸, 宅技术的宅技术(新技术 IT行业的潮流 嘿嘿)
转载请注明出处:[http://www.cnblogs.com/dennisit/archive/2013/05/07/3065126.html]
