A SIMPLE JAVA 3D PROGRAM CODE

Here are code fragments from a simple program, hello.java that creates a cube and a Rotation Interpolator behavior object that rotates the cube at a constant rate of /2 radians per second.

creating the hello class
The Hello class creates the branch graph that includes the cube and the Rotation Interpolator behavior. It then adds this branch graph to the Locale object generated by the Universe Builder utility.

public class hello extends Applet {

    public BranchGroup createSceneGraph() {

        // Create the root of the branch graph

        BranchGroup objRoot = new BranchGroup();

        // Create the TransformGroup node and initialize it to the
        // identity. Enable the TRANSFORM_WRITE capability so that
        // our behavior code can modify it at run time. Add it to
        // the root of the subgraph.

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

        // Create a simple Shape3D node; add it to the scene graph.

        objTrans.addChild(new ColorCube().getShape());

        // Create a new Behavior object that will perform the
        // desired operation on the specified transform and add
        // it into the scene graph.

        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);
        BoundingSphere bounds =
            new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
        rotator.setSchedulingBounds(bounds);
        objTrans.addChild(rotator);

        return objRoot;
    }

    public hello() {
        setLayout(new BorderLayout());
        Canvas3D c = new Canvas3D(graphicsConfig);
        add("Center", c);

        // Create a simple scene and attach it to the virtual
        // universe

        BranchGroup scene = createSceneGraph();
        UniverseBuilder u = new UniverseBuilder(c);
        u.addBranchGraph(scene);
    }

}

UniverseBuilder Class
The UniverseBuilder class establishes and initializes Java 3D's virtual universe, Locale, and viewing objects, and constructs the view platform branch graph. The example code shown below is a simplified version of the UniverseBuilder that will be supplied as part of the Java 3D utility package.

public class UniverseBuilder extends Object {

    // User-specified canvas

    Canvas3D canvas;


    // Scene graph elements to which the user may want access

    VirtualUniverse                        universe;
    Locale                        locale;
    TransformGroup                        vpTrans;
    View                        view;

    public UniverseBuilder(Canvas3D c) {
        this.canvas = c;


        // Establish a virtual universe that has a single
        // hi-res Locale

        universe = new VirtualUniverse();
        locale = new Locale(universe);


        // Create a PhysicalBody and PhysicalEnvironment object

        PhysicalBody body = new PhysicalBody();
        PhysicalEnvironment environment =
                                            new PhysicalEnvironment();


        // Create a View and attach the Canvas3D and the physical
        // body and environment to the view.

        view = new View();
        view.addCanvas3D(c);
        view.setPhysicalBody(body);
        view.setPhysicalEnvironment(environment);


        // Create a BranchGroup node for the view platform

        BranchGroup vpRoot = new BranchGroup();


        // Create a ViewPlatform object, and its associated
        // TransformGroup object, and attach it to the root of the
        // subgraph. Attach the view to the view platform.

        Transform3D t = new Transform3D();
        t.set(new Vector3f(0.0f, 0.0f, 2.0f));
        ViewPlatform vp = new ViewPlatform();
        vpTrans = new TransformGroup(t);

        vpTrans.addChild(vp);
        vpRoot.addChild(vpTrans);

        view.attachViewPlatform(vp);


        // Attach the branch graph to the universe, via the
        // Locale. The scene graph is now live!

        locale.addBranchGraph(vpRoot);
    }

    public void addBranchGraph(BranchGroup bg) {
        locale.addBranchGraph(bg);
    }

}




ColorCube Class
The ColorCube Class creates a Shape3D node that contains the geometry for an unlit, colored cube.




public class ColorCube extends Object {

    private static final float[] verts = {

    // front face

         1.0f, -1.0f,  1.0f,                             1.0f,  1.0f,  1.0f,
        -1.0f,  1.0f,  1.0f,                            -1.0f, -1.0f,  1.0f,

    // back face

        -1.0f, -1.0f, -1.0f,                            -1.0f,  1.0f, -1.0f,
         1.0f,  1.0f, -1.0f,                             1.0f, -1.0f, -1.0f,

    // right face

         1.0f, -1.0f, -1.0f,                             1.0f,  1.0f, -1.0f,
         1.0f,  1.0f,  1.0f,                             1.0f, -1.0f,  1.0f,

    // left face

        -1.0f, -1.0f,  1.0f,                            -1.0f,  1.0f,  1.0f,
        -1.0f,  1.0f, -1.0f,                            -1.0f, -1.0f, -1.0f,

    // top face

         1.0f,  1.0f,  1.0f,                             1.0f,  1.0f, -1.0f,
        -1.0f,  1.0f, -1.0f,                            -1.0f,  1.0f,  1.0f,

    // bottom face

        -1.0f, -1.0f,  1.0f,                            -1.0f, -1.0f, -1.0f,
         1.0f, -1.0f, -1.0f,                             1.0f, -1.0f,  1.0f,
    };
    private static final float[] colors = {

    // front face (red)

        1.0f, 0.0f, 0.0f,                            1.0f, 0.0f, 0.0f,
        1.0f, 0.0f, 0.0f,                            1.0f, 0.0f, 0.0f,

    // back face (green)

        0.0f, 1.0f, 0.0f,                            0.0f, 1.0f, 0.0f,
        0.0f, 1.0f, 0.0f,                            0.0f, 1.0f, 0.0f,

    // right face (blue)

        0.0f, 0.0f, 1.0f,                            0.0f, 0.0f, 1.0f,
        0.0f, 0.0f, 1.0f,                            0.0f, 0.0f, 1.0f,

    // left face (yellow)

        1.0f, 1.0f, 0.0f,                            1.0f, 1.0f, 0.0f,
        1.0f, 1.0f, 0.0f,                            1.0f, 1.0f, 0.0f,

    // top face (magenta)

        1.0f, 0.0f, 1.0f,                            1.0f, 0.0f, 1.0f,
        1.0f, 0.0f, 1.0f,                            1.0f, 0.0f, 1.0f,

    // bottom face (cyan)

        0.0f, 1.0f, 1.0f,                            0.0f, 1.0f, 1.0f,
        0.0f, 1.0f, 1.0f,                            0.0f, 1.0f, 1.0f,
    };

    private Shape3D shape;

    public ColorCube() {
        QuadArray cube = new QuadArray(24,
                        QuadArray.COORDINATES | QuadArray.COLOR_3);

        cube.setCoordinates(0, verts);
        cube.setColors(0, colors);

        shape = new Shape3D(cube, new Appearance());
    }

    public Shape3D getShape() {
        return shape;
    }

}