3dflyover.txt

This example creates a 3D fly-over of the city of Boston

  /**
   * Override Behavior's stimulus method to handle the event.
   */
  public void processStimulus(Enumeration criteria) {
    WakeupCriterion genericEvt;

    while (criteria.hasMoreElements()) {
      genericEvt = (WakeupCriterion) criteria.nextElement();

      if (genericEvt instanceof WakeupOnCollisionEntry) {
        m_Owner.onCollide(true);
      } else if (genericEvt instanceof WakeupOnCollisionExit) {
        m_Owner.onCollide(false);
      }
    }

    // Set wakeup criteria for next time
    wakeupOn(wakeupCondition);
  }
}

//creates a 2x2x2 cuboid with its base at y=0

class Cuboid extends ComplexObject {
  public Cuboid(Component comp, Group g, int nFlags) {
    super(comp, g, nFlags);
  }

  protected Group createGeometryGroup(Appearance app, Vector3d position,
      Vector3d scale, String szTextureFile, String szSoundFile) {
    int nFlags = GeometryArray.COORDINATES | GeometryArray.NORMALS;

    if ((m_nFlags & TEXTURE) == TEXTURE)
      nFlags |= GeometryArray.TEXTURE_COORDINATE_2;

    QuadArray quadArray = new QuadArray(24, nFlags);

    quadArray.setCoordinates(0, verts, 0, 24);

    for (int n = 0; n < 24; n++)
      quadArray.setNormal(n, normals[n / 4]);

    if ((m_nFlags & TEXTURE) == TEXTURE) {
      quadArray.setTextureCoordinates(0, 0, tcoords, 0, 24);
      setTexture(app, szTextureFile);
    }

    Shape3D shape = new Shape3D(quadArray, app);

    BranchGroup bg = new BranchGroup();
    bg.addChild(shape);
    return bg;
  }

  private static final float[] verts = {
  // front face
      1.0f, 0.0f, 1.0f, 1.0f, 2.0f, 1.0f, -1.0f, 2.0f, 1.0f, -1.0f, 0.0f,
      1.0f,
      // back face
      -1.0f, 0.0f, -1.0f, -1.0f, 2.0f, -1.0f, 1.0f, 2.0f, -1.0f, 1.0f,
      0.0f, -1.0f,
      // right face
      1.0f, 0.0f, -1.0f, 1.0f, 2.0f, -1.0f, 1.0f, 2.0f, 1.0f, 1.0f, 0.0f,
      1.0f,
      // left face
      -1.0f, 0.0f, 1.0f, -1.0f, 2.0f, 1.0f, -1.0f, 2.0f, -1.0f, -1.0f,
      0.0f, -1.0f,
      // top face
      1.0f, 2.0f, 1.0f, 1.0f, 2.0f, -1.0f, -1.0f, 2.0f, -1.0f, -1.0f,
      2.0f, 1.0f,
      // bottom face
      -1.0f, 0.0f, 1.0f, -1.0f, 0.0f, -1.0f, 1.0f, 0.0f, -1.0f, 1.0f,
      0.0f, 1.0f, };

  private static final float[] tcoords = {
  // front
      1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f,
      // back
      1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f,
      //right
      1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f,
      // left
      1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f,
      // top
      1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f,
      // bottom
      0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };

  private static final Vector3f[] normals = { new Vector3f(0.0f, 0.0f, 1.0f), // front
      // face
      new Vector3f(0.0f, 0.0f, -1.0f), // back face
      new Vector3f(1.0f, 0.0f, 0.0f), // right face
      new Vector3f(-1.0f, 0.0f, 0.0f), // left face
      new Vector3f(0.0f, 1.0f, 0.0f), // top face
      new Vector3f(0.0f, -1.0f, 0.0f), // bottom face
  };
}

class Helicopter extends ComplexObject
{  
  public static final float    WIDTH = 2.0f;
  public static final float    HEIGHT = 2.0f;
  public static final float    LENGTH = 2.0f;

  public Helicopter( Component comp, Group g, int nFlags )
  {
    super( comp, g, nFlags );    
  }

  protected Group createGeometryGroup( Appearance app, Vector3d position, Vector3d scale, String szTextureFile, String szSoundFile )
  {            
    TransformGroup tg = new TransformGroup( );

    // we need to flip the helicopter model
    // 90 degrees about the X axis
    Transform3D t3d = new Transform3D( );
    t3d.rotX( Math.toRadians( -90 ) );
    tg.setTransform( t3d );

    try
    {
      tg.addChild( loadGeometryGroup( "heli.obj", app ) );

      // create an Alpha object for the Interpolator
      Alpha alpha = new Alpha( -1,
        Alpha.INCREASING_ENABLE | Alpha.DECREASING_ENABLE,
        (long) Utils.getRandomNumber( 0, 500 ),
        (long)Utils.getRandomNumber( 0, 500 ),
        (long)Utils.getRandomNumber( 20000, 5000 ),
        4000,
        100,
        (long) Utils.getRandomNumber( 20000, 5000 ),
        5000,
        50 );

      attachSplinePathInterpolator( alpha, 
        new Transform3D( ),
        new URL( ((Java3dApplet) m_Component).getWorkingDirectory( ), "heli_spline.xls" ) );
    }
    catch( Exception e )
    {
      System.err.println( e.toString( ) );
    }

    return tg;
  }

  protected int getSoundLoop( boolean bCollide )
  {
    return -1;
  }

  protected float getSoundPriority( boolean bCollide )
  {
    return 1.0f;
  }

  protected float getSoundInitialGain( boolean bCollide )
  {
    return 3.0f;
  }

  protected Point2f[] getSoundDistanceGain( boolean bCollide )
  {
    Point2f[] gainArray = new Point2f[2];

    gainArray[0] = new Point2f( 2, 0.2f );
    gainArray[1] = new Point2f( 20, 0.05f );

    return gainArray;
  }

  protected boolean getSoundInitialEnable( boolean bCollide )
  {
    return true;
  }

  protected boolean getSoundContinuousEnable( boolean bCollide )
  {
    return false;
  }

  protected Bounds getSoundSchedulingBounds( boolean bCollide )
  {
    return new BoundingSphere( new Point3d( 0,0,0 ), 20 );
  }

  protected boolean getSoundReleaseEnable( boolean bCollide )
  {
    return true;
  }
}
//heli.obj

/*

# Mon Jun 21 15:53:56 1993
#
#

g
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