Coordinate axis

Question

how can I draw a coordinate axis in java3d? I want to draw a 3 lines but there's a problem with displaying it on screen.
It's only part of my code:
.... {...      LineArray line = new LineArray(4,GeometryArray.COORDINATES);
        line.setCoordinate( 2, new Point3f(0.0f, 0.2f, 0.0f));
        shape.setGeometry(line);
        root.addChild(objTrans);}....and that's ok, there's a line and everything is ok but....if I add another line
LineArray line2 = new LineArray(4,GeometryArray.COORDINATES);
        line2.setCoordinate( 2, new Point3f(0.0f, 0.2f, 0.0f));
         shape.setGeometry(line2);
        LineArray line = new LineArray(4,GeometryArray.COORDINATES);
        line.setCoordinate( 2, new Point3f(0.2f, 0.0f, 0.0f));
        shape.setGeometry(line);
        root.addChild(objTrans);I can see only one line :/
I don't know if I use this objects well :/. Anybody know what's wrong?
PS. I'm not good enough at Java3d (I've just started and I have to write this program to school for 2 days:/)
Thanks in advance

Answer 1

You have not gone throught the Chapter2 of Java3D for Creating Geometry.
[http://java.sun.com/developer/onlineTraining/java3d/j3d_tutorial_ch2.pdf]
In the link below, there are samples , you can read those.
[http://java.sun.com/developer/onlineTraining/java3d/index.html]
*      Axis.java 1.0 98/11/25
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
* Getting Started with the Java 3D API
* written in Java 3D
* This program demonstrates:
*   1. writing a visual object class
*      In this program, Axis class defines a visual object
*      This particular class extends Shape3D
*      See the text for a discussion.
*   2. Using LineArray to draw 3D lines.
import javax.media.j3d.*;
import javax.vecmath.*;
    public class Axis extends Shape3D{
     // create axis visual object
     public Axis() {
         this.setGeometry(createGeometry());
     private Geometry createGeometry(){
         // create line for X axis
            IndexedLineArray axisLines = new IndexedLineArray(18, GeometryArray.COORDINATES, 30);
         axisLines.setCoordinate( 0, new Point3f(-1.0f, 0.0f, 0.0f));
         axisLines.setCoordinate( 1, new Point3f( 1.0f, 0.0f, 0.0f));
         axisLines.setCoordinate( 2, new Point3f( 0.9f, 0.1f, 0.1f));
         axisLines.setCoordinate( 3, new Point3f( 0.9f,-0.1f, 0.1f));
         axisLines.setCoordinate( 4, new Point3f( 0.9f, 0.1f,-0.1f));
         axisLines.setCoordinate( 5, new Point3f( 0.9f,-0.1f,-0.1f));
         axisLines.setCoordinate( 6, new Point3f( 0.0f,-1.0f, 0.0f));
         axisLines.setCoordinate( 7, new Point3f( 0.0f, 1.0f, 0.0f));
         axisLines.setCoordinate( 8, new Point3f( 0.1f, 0.9f, 0.1f));
         axisLines.setCoordinate( 9, new Point3f(-0.1f, 0.9f, 0.1f));
         axisLines.setCoordinate(10, new Point3f( 0.1f, 0.9f,-0.1f));
         axisLines.setCoordinate(11, new Point3f(-0.1f, 0.9f,-0.1f));
         axisLines.setCoordinate(12, new Point3f( 0.0f, 0.0f,-1.0f));
         axisLines.setCoordinate(13, new Point3f( 0.0f, 0.0f, 1.0f));
         axisLines.setCoordinate(14, new Point3f( 0.1f, 0.1f, 0.9f));
         axisLines.setCoordinate(15, new Point3f(-0.1f, 0.1f, 0.9f));
         axisLines.setCoordinate(16, new Point3f( 0.1f,-0.1f, 0.9f));
         axisLines.setCoordinate(17, new Point3f(-0.1f,-0.1f, 0.9f));
            axisLines.setCoordinateIndex( 0, 0);
            axisLines.setCoordinateIndex( 1, 1);
            axisLines.setCoordinateIndex( 2, 2);
            axisLines.setCoordinateIndex( 3, 1);
            axisLines.setCoordinateIndex( 4, 3);
            axisLines.setCoordinateIndex( 5, 1);
            axisLines.setCoordinateIndex( 6, 4);
            axisLines.setCoordinateIndex( 7, 1);
            axisLines.setCoordinateIndex( 8, 5);
            axisLines.setCoordinateIndex( 9, 1);
            axisLines.setCoordinateIndex(10, 6);
            axisLines.setCoordinateIndex(11, 7);
            axisLines.setCoordinateIndex(12, 8);
            axisLines.setCoordinateIndex(13, 7);
            axisLines.setCoordinateIndex(14, 9);
            axisLines.setCoordinateIndex(15, 7);
            axisLines.setCoordinateIndex(16,10);
            axisLines.setCoordinateIndex(17, 7);
            axisLines.setCoordinateIndex(18,11);
            axisLines.setCoordinateIndex(19, 7);
            axisLines.setCoordinateIndex(20,12);
            axisLines.setCoordinateIndex(21,13);
            axisLines.setCoordinateIndex(22,14);
            axisLines.setCoordinateIndex(23,13);
            axisLines.setCoordinateIndex(24,15);
            axisLines.setCoordinateIndex(25,13);
            axisLines.setCoordinateIndex(26,16);
            axisLines.setCoordinateIndex(27,13);
            axisLines.setCoordinateIndex(28,17);
            axisLines.setCoordinateIndex(29,13);
            return axisLines;
     } // end of Axis createGeometry()
    } // end of class Axis