[JAVA3D] multiple viewPlatform

[HAroldo Pereira]

Hi

  I have a problem with nultiple ViewPlatform.

  I wish to see a cube in tree different form (front, left and rigth views).

  I rotate the TransformGroup that contain the ViewPlatform object. but it
does not works.

  The code is below.

  Help me.

  Haroldo

################################

import java.awt.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.image.TextureLoader;
import com.sun.j3d.utils.universe.*;

public class MultViews extends Frame {

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0),
100.0);

    public BranchGroup createSceneGraph() {
        // Create the root of the branch graph
        BranchGroup objRoot = new BranchGroup();

        // Create the transform group node and initialize it to the
        // identity.  Enable the TRANSFORM_WRITE capability so that
        // our behavior code can modify it at runtime.  Add it to the
        // root of the subgraph.
        TransformGroup objTrans = new TransformGroup();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        objRoot.addChild(objTrans);

        Transform3D t = new Transform3D();
        t.set(0.5);
        TransformGroup objTrans2 = new TransformGroup(t);
        objTrans2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        objTrans.addChild(objTrans2);


              Transform3D yAxis1 = new Transform3D();
              yAxis1.rotZ(Math.PI);

              Alpha tickTockAlpha = new Alpha(-1, Alpha.DECREASING_ENABLE |
Alpha.INCREASING_ENABLE, 0, 0, 10000, 0, 0, 0, 0, 0);
              RotationInterpolator transInterpolator = new
RotationInterpolator(tickTockAlpha, objTrans, yAxis1, (float) Math.PI*2.0f,
(float) 0.0f);
              transInterpolator.setSchedulingBounds(bounds);
              objTrans2.addChild(transInterpolator);

        // Create a simple shape leaf node, add it to the scene graph.
        objTrans2.addChild(new ColorCube(0.4));

        // Have Java 3D perform optimizations on this scene graph.
        objRoot.compile();

        return objRoot;
    }

    BranchGroup createViewGraph(SimpleUniverse u, Canvas3D c3d, int num) {
        BranchGroup viewRoot = new BranchGroup();

        TransformGroup offTg = new TransformGroup();
        offTg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        viewRoot.addChild(offTg);

        TransformGroup offTg2 = new TransformGroup();
        offTg2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        offTg.addChild(offTg2);

        // use same view distance as main view
        Viewer viewer = u.getViewer();
        double viewDistance = viewer.getView().getFieldOfView();
        // Calculate the distance from the to the imageplate.
        viewDistance = 1.0/Math.tan(viewDistance/2.0);

        Transform3D offset = new Transform3D();

        if (num == 0) {   // VIEWPOINT 2 : LEFT VIEW
//            Vector3d vet0 = new Vector3d(0.0, 0.0, viewDistance);
//            offset.set(vet0);
            offset.rotX(Math.PI);
            offTg.setTransform(offset);
        }
        else {           // VIEWPOINT 3 : RIGHT VIEW
            offset.rotX(-Math.PI);
            offTg.setTransform(offset);
        }

        PhysicalBody physicalBody = new PhysicalBody();
        PhysicalEnvironment physicalEnvironment = new PhysicalEnvironment();
        ViewPlatform viewPlatform = new ViewPlatform();
        offTg2.addChild(viewPlatform);

        View view = new View();
        view.addCanvas3D(c3d);
        view.setPhysicalBody(physicalBody);
        view.setPhysicalEnvironment(physicalEnvironment);
        view.attachViewPlatform(viewPlatform);

        return viewRoot;
    }

    public static void main(String args[]) {
        MultViews mv = new MultViews();
        mv.setLayout(new GridLayout(2, 2, 10, 10));

        GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();

        Canvas3D suCanvas = new Canvas3D(config);
        Canvas3D viewCanvas = new Canvas3D(config);
        Canvas3D view2Canvas = new Canvas3D(config);

        // Handle the close event
        mv.addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent winEvent)
            {
                System.exit(0);
            }
        });

        SimpleUniverse u = new SimpleUniverse(suCanvas);
        BranchGroup objRoot = mv.createSceneGraph();
        BranchGroup viewRoot = mv.createViewGraph(u, viewCanvas, 0);
        BranchGroup view2Root = mv.createViewGraph(u, view2Canvas, 1);

        u.getViewingPlatform().setNominalViewingTransform();
        u.addBranchGraph(objRoot);
        u.addBranchGraph(viewRoot);
        u.addBranchGraph(view2Root);

        mv.add(suCanvas);
        mv.add(view2Canvas);
        mv.add(viewCanvas);
        mv.setTitle("Java3D");
        mv.setSize(456, 456);
        mv.show();
    }
}

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