Re: VRML Loader

[Jie Zhang]

Here are step getting vrml loader.

1.  Getting vrml97.jar from
        www.vrml.org/workinggoups/vrml-java3d/
     you can get a zip file(vrml97.zip) ,which can be changed to jar file.
2. if your jdk1.2 is in c:\jdk1.2
      then you can arrange vrml97.jar to c:\jdk1.2\lib
  and write a line in autoexec.bat file:
     SET CLASSPATH=%CLASSPATH%;C:\JDK1.2\LIB\VRML97.jar
 restart your computer ,  then you can use it.

Here is a sample file which use vrml97.jar( two file, one is used to load vrml
, one is a main file.)
----------------------Vrml2.java-----------
//Vrml2.java

import java.applet.Applet;
import java.awt.BorderLayout;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.objectfile.ObjectFile;

public class Vrml2 extends Applet {
    public BranchGroup createSceneGraph()  {
  BranchGroup objRoot = new BranchGroup();
      TransformGroup objScale = new TransformGroup();
        Transform3D t3d = new Transform3D();
        t3d.setScale(0.3);
        objScale.setTransform(t3d);
        objRoot.addChild(objScale);

     BoundingSphere bounds =
   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(bounds);
 objRoot.addChild(bg);


        Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f);
        Vector3f light1Direction  = new Vector3f(4.0f, -7.0f, -12.0f);



        DirectionalLight light1
            = new DirectionalLight(light1Color, light1Direction);
        light1.setInfluencingBounds(bounds);
        objRoot.addChild(light1);

 TransformGroup objTrans = new TransformGroup();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
   objScale.addChild(objTrans);

        BranchGroup b1 = new  vrmlLoad("7.wrl");
           objTrans.addChild(b1);

        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(bounds);
        objTrans.addChild(rotator);

        objRoot.compile();
 return objRoot;
    }

    public Vrml2(String args[]) {
      setLayout(new BorderLayout());
 Canvas3D c = new Canvas3D(null);
 add("Center", c);
 BranchGroup scene = createSceneGraph();
 SimpleUniverse u = new SimpleUniverse(c);
        u.getViewingPlatform().setNominalViewingTransform();
        u.addBranchGraph(scene);
    }

    public static void main(String[] args) {
        new MainFrame(new Vrml2(args), 400,400);
    }
}
//end of Vrml2.java
---------------------vrmlLoad.java--------

//vrmlLoad.java

import javax.media.j3d.*;
import java.io.*;
import com.sun.j3d.loaders.vrml97.VrmlLoader;
import com.sun.j3d.loaders.Scene;

public class vrmlLoad extends BranchGroup{

   public  vrmlLoad(String filename)  {
            BranchGroup obj = new BranchGroup( );

   VrmlLoader loader = new VrmlLoader();
        Scene s = null;
 try {
       s = loader.load(filename);
     } catch (Exception e) {
       System.err.println(e);
       System.exit(1);
     }

        obj.addChild(s.getSceneGroup( ) );
        this.addChild(obj);
                 }
}
//end of vrmlLoad.java
---------------------end of two files------

Yi Zhuang wrote:

> I heard there are serveral VRML Loader. Anyone tell me which is better and
> where to download.
> Thanks
> Andy