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
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废话不多说 , 直接上代码 , 说明见代码注释
package com.java3d.dennist.loader;importjavax.media.j3d.BranchGroup;importcom.sun.j3d.loaders.Scene;importcom.sun.j3d.loaders.objectfile.ObjectFile;/** *
*
* @version ： 1.1
*
* @author ： 苏若年 <a href="mailto:DennisIT@163.com">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
*
*/publicclassObjFileReaderextendsBranchGroup{privatedoublecreaseAngle =60.0;
/** *
* 读取ObjModel文件
*
* @param filePath obj文件路径
*
*/publicObjFileReader(StringfilePath){BranchGroupbranchGroup=newBranchGroup();intflags =ObjectFile.RESIZE;ObjectFileobjFile=newObjectFile(flags, (float)(creaseAngle*Math.PI)/180);Scenescenen=null;
try {
scenen = objFile.load(filePath);
} catch(Exceptione) { 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:DennisIT@163.com">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
*
*/publicclassJavaModelObjLoaderAppextends Applet{
/** *
*/privatestaticfinallongserialVersionUID =5841679659336190804L;
public BranchGroup createSceneGraph(){
// 创建场景图分支BranchGroupgroup=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=newBoundingSphere(newPoint3d(0.0,0.0,0.0),100.0);
Color3f bgColor =newColor3f(0.05f,0.05f,0.2f);
Background bg =newBackground(bgColor); bg.setApplicationBounds(bound);group.addChild(bg);// 设置光源Color3f lightColor =newColor3f(1.0f,1.0f,0.9f);
Vector3f lightDirection =newVector3f(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(newObjFileReader("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 =newAlpha(-1,Alpha.INCREASING_ENABLE,
0,0,
4000,0,0,
0,0,0);
RotationInterpolator rotator =newRotationInterpolator(rotationAlpha, objTrans,yAxis,0.0f,(float)Math.PI*2.0f); rotator.setSchedulingBounds(bound); objTrans.addChild(rotator);group.compile();returngroup; }public JavaModelObjLoaderApp(){
setLayout(new BorderLayout());
// 创建3D场景绘制画布Canvas3D对象Canvas3D canvas =newCanvas3D(null);
add("Center",canvas);
BranchGroup scene = createSceneGraph();
SimpleUniverse universe =new SimpleUniverse(canvas);
universe.getViewingPlatform().setNominalViewingTransform();
universe.addBranchGraph(scene);
}
publicstaticvoid main(String[] args) {
newMainFrame(newJavaModelObjLoaderApp(),360,360);
}
}
实例扩展 : 实现场景中多个模型
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:DennisIT@163.com">发送邮件</a>
*
* @since ： 1.0 创建时间: 2013-5-7 下午03:46:59
*
* TODO :
*
*/publicclassJavaModelObjMultiLoaderAppextendsApplet{/** *
*/privatestaticfinallongserialVersionUID =3645520149291184985L;
publicBranchGroupcreateSceneGraph(){// 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=newBoundingSphere(newPoint3d(0.0,0.0,0.0),100.0);
Color3f bgColor =newColor3f(0.05f,0.05f,0.2f);
Background bg =new Background(bgColor);
bg.setApplicationBounds(bound);
group.addChild(bg);
// 设置光源Color3f lightColor =newColor3f(1.0f,1.0f,0.9f);
Vector3f lightDirection =newVector3f(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 =newObjFileReader("F:/guanyu.obj");
BranchGroup branchGroup2 =newObjFileReader("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 */privateGroupcreateObject(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 =newAlpha(-1,Alpha.INCREASING_ENABLE,
0,0,
time,0,0,
0,0,0);
RotationInterpolator rotator =newRotationInterpolator(rotationAlpha, sgroup,yAxis,0.0f,(float)Math.PI*2.0f);
rotator.setSchedulingBounds(bound);
objTrans.addChild(rotator);
objTrans.addChild(sgroup);
return objTrans;
}
publicJavaModelObjMultiLoaderApp(){ setLayout(new BorderLayout());
// 创建3D场景绘制画布Canvas3D对象Canvas3D canvas =newCanvas3D(null);
add("Center",canvas);
BranchGroup scene = createSceneGraph();
SimpleUniverse universe =new SimpleUniverse(canvas);
//设定用户视角Point3d userPosition =newPoint3d(0,3,6);
initUserPosition(universe,userPosition);
//universe.getViewingPlatform().setNominalViewingTransform(); universe.addBranchGraph(scene);
}
//初始化用户视角private voidinitUserPosition(SimpleUniverse universe,Point3d userPosition){ ViewingPlatform vp= universe.getViewingPlatform();
TransformGroup steerTG = vp.getViewPlatformTransform();
Transform3D t3d =new Transform3D();
steerTG.getTransform(t3d);
t3d.lookAt(userPosition, newPoint3d(0,0,0),newVector3d(0,1,0));
t3d.invert();
steerTG.setTransform(t3d);
}
public static voidmain(String[] args){newMainFrame(newJavaModelObjMultiLoaderApp(),350,210);
}
}
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