tim/prune/threedee/Java3DWindow.java

   1 package tim.prune.threedee;
   2
   3 import java.awt.FlowLayout;
   4 import java.awt.BorderLayout;
   5 import java.awt.Font;
   6 import java.awt.GraphicsConfiguration;
   7 import java.awt.GraphicsEnvironment;
   8 import java.awt.event.ActionEvent;
   9 import java.awt.event.ActionListener;
  10 import java.awt.event.WindowAdapter;
  11 import java.awt.event.WindowEvent;
  12 import java.awt.geom.GeneralPath;
  13
  14 import javax.media.j3d.AmbientLight;
  15 import javax.media.j3d.Appearance;
  16 import javax.media.j3d.BoundingSphere;
  17 import javax.media.j3d.BranchGroup;
  18 import javax.media.j3d.Canvas3D;
  19 import javax.media.j3d.Font3D;
  20 import javax.media.j3d.FontExtrusion;
  21 import javax.media.j3d.GraphicsConfigTemplate3D;
  22 import javax.media.j3d.Group;
  23 import javax.media.j3d.Material;
  24 import javax.media.j3d.PointLight;
  25 import javax.media.j3d.Shape3D;
  26 import javax.media.j3d.Text3D;
  27 import javax.media.j3d.Transform3D;
  28 import javax.media.j3d.TransformGroup;
  29 import javax.swing.JButton;
  30 import javax.swing.JFrame;
  31 import javax.swing.JOptionPane;
  32 import javax.swing.JPanel;
  33 import javax.vecmath.Color3f;
  34 import javax.vecmath.Matrix3d;
  35 import javax.vecmath.Point3d;
  36 import javax.vecmath.Point3f;
  37 import javax.vecmath.Vector3d;
  38
  39 import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
  40 import com.sun.j3d.utils.geometry.Box;
  41 import com.sun.j3d.utils.geometry.Cylinder;
  42 import com.sun.j3d.utils.geometry.Sphere;
  43 import com.sun.j3d.utils.universe.SimpleUniverse;
  44
  45 import tim.prune.FunctionLibrary;
  46 import tim.prune.I18nManager;
  47 import tim.prune.data.Track;
  48 import tim.prune.function.Export3dFunction;
  49
  50
  51 /**
  52  * Class to hold main window for java3d view of data
  53  */
  54 public class Java3DWindow implements ThreeDWindow
  55 {
  56         private Track _track = null;
  57         private JFrame _parentFrame = null;
  58         private JFrame _frame = null;
  59         private ThreeDModel _model = null;
  60         private OrbitBehavior _orbit = null;
  61         private double _altFactor = 50.0;
  62
  63         /** only prompt about big track size once */
  64         private static boolean TRACK_SIZE_WARNING_GIVEN = false;
  65
  66         // Constants
  67         private static final double INITIAL_Y_ROTATION = -25.0;
  68         private static final double INITIAL_X_ROTATION = 15.0;
  69         private static final String CARDINALS_FONT = "Arial";
  70         private static final int MAX_TRACK_SIZE = 2500; // threshold for warning
  71
  72
  73         /**
  74          * Constructor
  75          * @param inFrame parent frame
  76          */
  77         public Java3DWindow(JFrame inFrame)
  78         {
  79                 _parentFrame = inFrame;
  80         }
  81
  82
  83         /**
  84          * Set the track object
  85          * @param inTrack Track object
  86          */
  87         public void setTrack(Track inTrack)
  88         {
  89                 _track = inTrack;
  90         }
  91
  92
  93         /**
  94          * Show the window
  95          */
  96         public void show() throws ThreeDException
  97         {
  98                 // Get the altitude exaggeration to use
  99                 Object factorString = JOptionPane.showInputDialog(_parentFrame,
 100                         I18nManager.getText("dialog.3d.altitudefactor"),
 101                         I18nManager.getText("dialog.3d.title"),
 102                         JOptionPane.QUESTION_MESSAGE, null, null, _altFactor);
 103                 if (factorString == null) return;
 104                 try {
 105                         _altFactor = Double.parseDouble(factorString.toString());
 106                 }
 107                 catch (Exception e) {} // Ignore parse errors
 108                 if (_altFactor < 1.0) {_altFactor = 1.0;}
 109
 110                 // Set up the graphics config
 111                 GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
 112                 if (config == null)
 113                 {
 114                         // Config shouldn't be null, but we can try to create a new one as a workaround
 115                         GraphicsConfigTemplate3D gc = new GraphicsConfigTemplate3D();
 116                         gc.setDepthSize(0);
 117                         config = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getBestConfiguration(gc);
 118                 }
 119
 120                 if (config == null)
 121                 {
 122                         // Second attempt also failed, going to have to give up here.
 123                         throw new ThreeDException("Couldn't create graphics config");
 124                 }
 125
 126                 // Check number of points in model isn't too big, and suggest compression
 127                 Object[] buttonTexts = {I18nManager.getText("button.continue"), I18nManager.getText("button.cancel")};
 128                 if (_track.getNumPoints() > MAX_TRACK_SIZE && !TRACK_SIZE_WARNING_GIVEN)
 129                 {
 130                         // FIXME: Change text reference from exportpov to java3d
 131                         if (JOptionPane.showOptionDialog(_parentFrame,
 132                                         I18nManager.getText("dialog.exportpov.warningtracksize"),
 133                                         I18nManager.getText("function.show3d"), JOptionPane.OK_CANCEL_OPTION,
 134                                         JOptionPane.WARNING_MESSAGE, null, buttonTexts, buttonTexts[1])
 135                                 == JOptionPane.OK_OPTION)
 136                         {
 137                                 // opted to continue, don't show warning again
 138                                 TRACK_SIZE_WARNING_GIVEN = true;
 139                         }
 140                         else {
 141                                 // opted to cancel - show warning again next time
 142                                 return;
 143                         }
 144                 }
 145
 146                 Canvas3D canvas = new Canvas3D(config);
 147                 canvas.setSize(400, 300);
 148
 149                 // Create the scene and attach it to the virtual universe
 150                 BranchGroup scene = createSceneGraph();
 151                 SimpleUniverse u = new SimpleUniverse(canvas);
 152
 153                 // This will move the ViewPlatform back a bit so the
 154                 // objects in the scene can be viewed.
 155                 u.getViewingPlatform().setNominalViewingTransform();
 156
 157                 // Add behaviour to rotate using mouse
 158                 _orbit = new OrbitBehavior(canvas, OrbitBehavior.REVERSE_ALL | OrbitBehavior.STOP_ZOOM);
 159                 BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
 160                 _orbit.setSchedulingBounds(bounds);
 161                 u.getViewingPlatform().setViewPlatformBehavior(_orbit);
 162                 u.addBranchGraph(scene);
 163
 164                 // Don't reuse _frame object from last time, because data and/or scale might be different
 165                 // Need to regenerate everything
 166                 _frame = new JFrame(I18nManager.getText("dialog.3d.title"));
 167                 _frame.getContentPane().setLayout(new BorderLayout());
 168                 _frame.getContentPane().add(canvas, BorderLayout.CENTER);
 169                 _frame.setIconImage(_parentFrame.getIconImage());
 170                 // Make panel for render, close buttons
 171                 JPanel panel = new JPanel();
 172                 panel.setLayout(new FlowLayout(FlowLayout.RIGHT));
 173                 // Add button for exporting pov
 174                 JButton povButton = new JButton(I18nManager.getText("function.exportpov"));
 175                 povButton.addActionListener(new ActionListener() {
 176                         /** Export pov button pressed */
 177                         public void actionPerformed(ActionEvent e)
 178                         {
 179                                 if (_orbit != null) {
 180                                         callbackRender(FunctionLibrary.FUNCTION_POVEXPORT);
 181                                 }
 182                         }});
 183                 panel.add(povButton);
 184                 // Add button for exporting svg
 185                 JButton svgButton = new JButton(I18nManager.getText("function.exportsvg"));
 186                 svgButton.addActionListener(new ActionListener() {
 187                         public void actionPerformed(ActionEvent e)
 188                         {
 189                                 if (_orbit != null) {
 190                                         callbackRender(FunctionLibrary.FUNCTION_SVGEXPORT);
 191                                 }
 192                         }});
 193                 panel.add(svgButton);
 194                 // Display coordinates of lat/long lines of 3d graph in separate dialog
 195                 JButton showLinesButton = new JButton(I18nManager.getText("button.showlines"));
 196                 showLinesButton.addActionListener(new ActionListener() {
 197                         public void actionPerformed(ActionEvent e)
 198                         {
 199                                 double[] latLines = _model.getLatitudeLines();
 200                                 double[] lonLines = _model.getLongitudeLines();
 201                                 LineDialog dialog = new LineDialog(_frame, latLines, lonLines);
 202                                 dialog.showDialog();
 203                         }
 204                 });
 205                 panel.add(showLinesButton);
 206                 // Close button
 207                 JButton closeButton = new JButton(I18nManager.getText("button.close"));
 208                 closeButton.addActionListener(new ActionListener()
 209                 {
 210                         /** Close button pressed - clean up */
 211                         public void actionPerformed(ActionEvent e) {
 212                                 dispose();
 213                                 _orbit = null;
 214                         }
 215                 });
 216                 panel.add(closeButton);
 217                 _frame.getContentPane().add(panel, BorderLayout.SOUTH);
 218                 _frame.setSize(500, 350);
 219                 _frame.pack();
 220                 // Add a listener to clean up when window closed
 221                 _frame.addWindowListener(new WindowAdapter() {
 222                         public void windowClosing(WindowEvent e) {
 223                                 dispose();
 224                         }
 225                 });
 226
 227                 // show frame
 228                 _frame.setVisible(true);
 229                 if (_frame.getState() == JFrame.ICONIFIED) {
 230                         _frame.setState(JFrame.NORMAL);
 231                 }
 232         }
 233
 234         /**
 235          * Dispose of the frame and its resources
 236          */
 237         public void dispose()
 238         {
 239                 if (_frame != null) {
 240                         _frame.dispose();
 241                         _frame = null;
 242                 }
 243         }
 244
 245         /**
 246          * Create the whole scenery from the given track
 247          * @return all objects in the scene
 248          */
 249         private BranchGroup createSceneGraph()
 250         {
 251                 // Create the root of the branch graph
 252                 BranchGroup objRoot = new BranchGroup();
 253
 254                 // Create the transform group node and initialize it.
 255                 // Enable the TRANSFORM_WRITE capability so it can be spun by the mouse
 256                 TransformGroup objTrans = new TransformGroup();
 257                 objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
 258
 259                 // Create a translation
 260                 Transform3D shiftz = new Transform3D();
 261                 shiftz.setScale(0.055);
 262                 TransformGroup shiftTrans = new TransformGroup(shiftz);
 263
 264                 objRoot.addChild(shiftTrans);
 265                 Transform3D rotTrans = new Transform3D();
 266                 rotTrans.rotY(Math.toRadians(INITIAL_Y_ROTATION));
 267                 Transform3D rot2 = new Transform3D();
 268                 rot2.rotX(Math.toRadians(INITIAL_X_ROTATION));
 269                 TransformGroup tg2 = new TransformGroup(rot2);
 270                 objTrans.setTransform(rotTrans);
 271                 shiftTrans.addChild(tg2);
 272                 tg2.addChild(objTrans);
 273
 274                 // Base plane
 275                 Appearance planeAppearance = null;
 276                 Box plane = null;
 277                 planeAppearance = new Appearance();
 278                 planeAppearance.setMaterial(new Material(new Color3f(0.1f, 0.2f, 0.2f),
 279                         new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.3f, 0.4f, 0.4f),
 280                         new Color3f(0.3f, 0.3f, 0.3f), 0.0f));
 281                 plane = new Box(10f, 0.04f, 10f, planeAppearance);
 282                 objTrans.addChild(plane);
 283
 284                 // N, S, E, W
 285                 GeneralPath bevelPath = new GeneralPath();
 286                 bevelPath.moveTo(0.0f, 0.0f);
 287                 for (int i=0; i<91; i+= 5) {
 288                         bevelPath.lineTo((float) (0.1 - 0.1 * Math.cos(Math.toRadians(i))),
 289                           (float) (0.1 * Math.sin(Math.toRadians(i))));
 290                 }
 291                 for (int i=90; i>0; i-=5) {
 292                         bevelPath.lineTo((float) (0.3 + 0.1 * Math.cos(Math.toRadians(i))),
 293                           (float) (0.1 * Math.sin(Math.toRadians(i))));
 294                 }
 295                 Font3D compassFont = new Font3D(
 296                         new Font(CARDINALS_FONT, Font.PLAIN, 1),
 297                         new FontExtrusion(bevelPath));
 298                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.n"), new Point3f(0f, 0f, -10f), compassFont));
 299                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.s"), new Point3f(0f, 0f, 10f), compassFont));
 300                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.w"), new Point3f(-11f, 0f, 0f), compassFont));
 301                 objTrans.addChild(createCompassPoint(I18nManager.getText("cardinal.e"), new Point3f(10f, 0f, 0f), compassFont));
 302
 303                 // create and scale model
 304                 _model = new ThreeDModel(_track);
 305                 _model.setAltitudeFactor(_altFactor);
 306                 _model.scale();
 307
 308                 // Lat/Long lines
 309                 objTrans.addChild(createLatLongs(_model));
 310
 311                 // Add points to model
 312                 objTrans.addChild(createDataPoints(_model));
 313
 314                 // Create lights
 315                 BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
 316                 AmbientLight aLgt = new AmbientLight(new Color3f(1.0f, 1.0f, 1.0f));
 317                 aLgt.setInfluencingBounds(bounds);
 318                 objTrans.addChild(aLgt);
 319
 320                 PointLight pLgt = new PointLight(new Color3f(1.0f, 1.0f, 1.0f),
 321                         new Point3f(0f, 0f, 2f), new Point3f(0.25f, 0.05f, 0.0f) );
 322                 pLgt.setInfluencingBounds(bounds);
 323                 objTrans.addChild(pLgt);
 324
 325                 PointLight pl2 = new PointLight(new Color3f(0.8f, 0.9f, 0.4f),
 326                         new Point3f(6f, 1f, 6f), new Point3f(0.2f, 0.1f, 0.05f) );
 327                 pl2.setInfluencingBounds(bounds);
 328                 objTrans.addChild(pl2);
 329
 330                 PointLight pl3 = new PointLight(new Color3f(0.7f, 0.7f, 0.7f),
 331                         new Point3f(0.0f, 12f, -2f), new Point3f(0.1f, 0.1f, 0.0f) );
 332                 pl3.setInfluencingBounds(bounds);
 333                 objTrans.addChild(pl3);
 334
 335                 // Have Java 3D perform optimizations on this scene graph.
 336                 objRoot.compile();
 337
 338                 return objRoot;
 339         }
 340
 341
 342         /**
 343          * Create a text object for compass point, N S E or W
 344          * @param text text to display
 345          * @param locn position at which to display
 346          * @param font 3d font to use
 347          * @return Shape3D object
 348          */
 349         private Shape3D createCompassPoint(String inText, Point3f inLocn, Font3D inFont)
 350         {
 351                 Text3D txt = new Text3D(inFont, inText, inLocn, Text3D.ALIGN_FIRST, Text3D.PATH_RIGHT);
 352                 Material mat = new Material(new Color3f(0.5f, 0.5f, 0.55f),
 353                         new Color3f(0.05f, 0.05f, 0.1f), new Color3f(0.3f, 0.4f, 0.5f),
 354                         new Color3f(0.4f, 0.5f, 0.7f), 70.0f);
 355                 mat.setLightingEnable(true);
 356                 Appearance app = new Appearance();
 357                 app.setMaterial(mat);
 358                 Shape3D shape = new Shape3D(txt, app);
 359                 return shape;
 360         }
 361
 362
 363         /**
 364          * Create all the latitude and longitude lines on the base plane
 365          * @param inModel model containing data
 366          * @return Group object containing cylinders for lat and long lines
 367          */
 368         private static Group createLatLongs(ThreeDModel inModel)
 369         {
 370                 Group group = new Group();
 371                 int numlines = inModel.getLatitudeLines().length;
 372                 for (int i=0; i<numlines; i++)
 373                 {
 374                         group.addChild(createLatLine(inModel.getScaledLatitudeLine(i), inModel.getModelSize()));
 375                 }
 376                 numlines = inModel.getLongitudeLines().length;
 377                 for (int i=0; i<numlines; i++)
 378                 {
 379                         group.addChild(createLonLine(inModel.getScaledLongitudeLine(i), inModel.getModelSize()));
 380                 }
 381                 return group;
 382         }
 383
 384
 385         /**
 386          * Make a single latitude line for the specified latitude
 387          * @param inLatitude latitude in scaled units
 388          * @param inSize size of model, for length of line
 389          * @return Group object containing cylinder for latitude line
 390          */
 391         private static Group createLatLine(double inLatitude, double inSize)
 392         {
 393                 Cylinder latline = new Cylinder(0.1f, (float) (inSize*2));
 394                 Transform3D horizShift = new Transform3D();
 395                 horizShift.setTranslation(new Vector3d(0.0, 0.0, -inLatitude));
 396                 TransformGroup horizTrans = new TransformGroup(horizShift);
 397                 Transform3D zRot = new Transform3D();
 398                 zRot.rotZ(Math.toRadians(90.0));
 399                 TransformGroup zTrans = new TransformGroup(zRot);
 400                 horizTrans.addChild(zTrans);
 401                 zTrans.addChild(latline);
 402                 return horizTrans;
 403         }
 404
 405
 406         /**
 407          * Make a single longitude line for the specified longitude
 408          * @param inLongitude longitude in scaled units
 409          * @param inSize size of model, for length of line
 410          * @return Group object containing cylinder for longitude line
 411          */
 412         private static Group createLonLine(double inLongitude, double inSize)
 413         {
 414                 Cylinder lonline = new Cylinder(0.1f, (float) (inSize*2));
 415                 Transform3D horizShift = new Transform3D();
 416                 horizShift.setTranslation(new Vector3d(inLongitude, 0.0, 0.0));
 417                 TransformGroup horizTrans = new TransformGroup(horizShift);
 418                 Transform3D xRot = new Transform3D();
 419                 xRot.rotX(Math.toRadians(90.0));
 420                 TransformGroup xTrans = new TransformGroup(xRot);
 421                 horizTrans.addChild(xTrans);
 422                 xTrans.addChild(lonline);
 423                 return horizTrans;
 424         }
 425
 426
 427         /**
 428          * Make a Group of the data points to be added
 429          * @param inModel model containing data
 430          * @return Group object containing spheres, rods etc
 431          */
 432         private static Group createDataPoints(ThreeDModel inModel)
 433         {
 434                 // Add points to model
 435                 Group group = new Group();
 436                 int numPoints = inModel.getNumPoints();
 437                 for (int i=0; i<numPoints; i++)
 438                 {
 439                         byte pointType = inModel.getPointType(i);
 440                         if (pointType == ThreeDModel.POINT_TYPE_WAYPOINT)
 441                         {
 442                                 // Add waypoint
 443                                 // Note that x, y and z are horiz, altitude, -vert
 444                                 group.addChild(createWaypoint(new Point3d(
 445                                         inModel.getScaledHorizValue(i), inModel.getScaledAltValue(i), -inModel.getScaledVertValue(i))));
 446                         }
 447                         else
 448                         {
 449                                 // Add colour-coded track point
 450                                 // Note that x, y and z are horiz, altitude, -vert
 451                                 group.addChild(createTrackpoint(new Point3d(
 452                                         inModel.getScaledHorizValue(i), inModel.getScaledAltValue(i), -inModel.getScaledVertValue(i)),
 453                                         inModel.getPointHeightCode(i)));
 454                         }
 455                 }
 456                 return group;
 457         }
 458
 459
 460         /**
 461          * Create a waypoint sphere
 462          * @param inPointPos position of point
 463          * @return Group object containing sphere
 464          */
 465         private static Group createWaypoint(Point3d inPointPos)
 466         {
 467                 Material mat = getWaypointMaterial();
 468                 // MAYBE: sort symbol scaling
 469                 Sphere dot = new Sphere(0.35f); // * symbolScaling / 100f);
 470                 return createBall(inPointPos, dot, mat);
 471         }
 472
 473
 474         /**
 475          * @return a new Material object to define waypoint colour / shine etc
 476          */
 477         private static Material getWaypointMaterial()
 478         {
 479                 return new Material(new Color3f(0.1f, 0.1f, 0.4f),
 480                          new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.0f, 0.2f, 0.7f),
 481                          new Color3f(1.0f, 0.6f, 0.6f), 40.0f);
 482         }
 483
 484
 485         /** @return track point object */
 486         private static Group createTrackpoint(Point3d inPointPos, byte inHeightCode)
 487         {
 488                 Material mat = getTrackpointMaterial(inHeightCode);
 489                 // MAYBE: sort symbol scaling
 490                 Sphere dot = new Sphere(0.2f);
 491                 return createBall(inPointPos, dot, mat);
 492         }
 493
 494
 495         /** @return Material object for track points with the appropriate colour for the height */
 496         private static Material getTrackpointMaterial(byte inHeightCode)
 497         {
 498                 // create default material
 499                 Material mat = new Material(new Color3f(0.3f, 0.2f, 0.1f),
 500                         new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.0f, 0.6f, 0.0f),
 501                         new Color3f(1.0f, 0.6f, 0.6f), 70.0f);
 502                 // change colour according to height code
 503                 if (inHeightCode == 1) mat.setDiffuseColor(new Color3f(0.4f, 0.9f, 0.2f));
 504                 else if (inHeightCode == 2) mat.setDiffuseColor(new Color3f(0.7f, 0.8f, 0.2f));
 505                 else if (inHeightCode == 3) mat.setDiffuseColor(new Color3f(0.3f, 0.6f, 0.4f));
 506                 else if (inHeightCode == 4) mat.setDiffuseColor(new Color3f(0.1f, 0.9f, 0.9f));
 507                 else if (inHeightCode >= 5) mat.setDiffuseColor(new Color3f(1.0f, 1.0f, 1.0f));
 508                 // return object
 509                 return mat;
 510         }
 511
 512
 513         /**
 514          * Create a ball at the given point
 515          * @param inPosition scaled position of point
 516          * @param inSphere sphere object
 517          * @param inMaterial material object
 518          * @return Group containing sphere
 519          */
 520         private static Group createBall(Point3d inPosition, Sphere inSphere, Material inMaterial)
 521         {
 522                 Group group = new Group();
 523                 // Create ball and add to group
 524                 Transform3D ballShift = new Transform3D();
 525                 ballShift.setTranslation(new Vector3d(inPosition));
 526                 TransformGroup ballShiftTrans = new TransformGroup(ballShift);
 527                 inMaterial.setLightingEnable(true);
 528                 Appearance ballApp = new Appearance();
 529                 ballApp.setMaterial(inMaterial);
 530                 inSphere.setAppearance(ballApp);
 531                 ballShiftTrans.addChild(inSphere);
 532                 group.addChild(ballShiftTrans);
 533                 // Also create rod for ball to sit on
 534                 Cylinder rod = new Cylinder(0.1f, (float) inPosition.y);
 535                 Material rodMat = new Material(new Color3f(0.2f, 0.2f, 0.2f),
 536                         new Color3f(0.0f, 0.0f, 0.0f), new Color3f(0.2f, 0.2f, 0.2f),
 537                         new Color3f(0.05f, 0.05f, 0.05f), 0.4f);
 538                 rodMat.setLightingEnable(true);
 539                 Appearance rodApp = new Appearance();
 540                 rodApp.setMaterial(rodMat);
 541                 rod.setAppearance(rodApp);
 542                 Transform3D rodShift = new Transform3D();
 543                 rodShift.setTranslation(new Vector3d(inPosition.x, inPosition.y/2.0, inPosition.z));
 544                 TransformGroup rodShiftTrans = new TransformGroup(rodShift);
 545                 rodShiftTrans.addChild(rod);
 546                 group.addChild(rodShiftTrans);
 547                 // return the pair
 548                 return group;
 549         }
 550
 551
 552         /**
 553          * Calculate the angles and call them back to the app
 554          * @param inFunction function to call (either pov or svg)
 555          */
 556         private void callbackRender(Export3dFunction inFunction)
 557         {
 558                 Transform3D trans3d = new Transform3D();
 559                 _orbit.getViewingPlatform().getViewPlatformTransform().getTransform(trans3d);
 560                 Matrix3d matrix = new Matrix3d();
 561                 trans3d.get(matrix);
 562                 Point3d point = new Point3d(0.0, 0.0, 1.0);
 563                 matrix.transform(point);
 564                 // Set up initial rotations
 565                 Transform3D firstTran = new Transform3D();
 566                 firstTran.rotY(Math.toRadians(-INITIAL_Y_ROTATION));
 567                 Transform3D secondTran = new Transform3D();
 568                 secondTran.rotX(Math.toRadians(-INITIAL_X_ROTATION));
 569                 // Apply inverse rotations in reverse order to the test point
 570                 Point3d result = new Point3d();
 571                 secondTran.transform(point, result);
 572                 firstTran.transform(result);
 573                 // Callback settings to pov export function
 574                 inFunction.setCameraCoordinates(result.x, result.y, result.z);
 575                 inFunction.setAltitudeExaggeration(_altFactor);
 576                 inFunction.begin();
 577         }
 578 }