Adding multiple objects

Question

Hi.
I'm trying to add multiple objects to my universe, but i'm not sure how to do it. What i was thinking was to create a for loop and create the object within it.The z value refers to the z vector point.The code is below.I'm new to java 3D so if anyone could help me, that would be great.
Thanks
Sharon.      
for (float z = 0f; z < 20f; z = z + 2){
          Cylinder cylinder = new Cylinder( 0.8f,10f );
          Color3f col = new Color3f(8f, .15f, .15f);
          ColoringAttributes ca = new ColoringAttributes (col,ColoringAttributes.NICEST);
          app.setColoringAttributes(ca);
          cylinder.setAppearance(app);
          Transform3D transform = new Transform3D();
          Vector3f vector = new Vector3f(0f, 0f, z);
          transform.setTranslation(vector);
          tg.setTransform(transform);
          tg.addChild( cylinder );
          bg.addChild( tg );
}

Answer 1

Hi.
I have two programs, BGroup.java, which creates a rotating sphere and coloring attributes etc. and some1Canvas3D.java which creates a canvas and simple universe and panel with buttons and works on the BGroup.java program by adding it as a branchgraph to the simple universe "simpleU.addBranchGraph(new BGroup());". what i'd like to do is that if one of the buttons in some1Canvas3D.java is pressed then i want to decrease/increase the radius size of the sphere in BGroup.java. and see this within the canvas.
I'm not sure how this will work.
If anyone has any ideas how to do this, that'd be great.
The code for the two programs is below . i'm quite new to Java3D so i hope it makes sense.
Thanks for you help.
Sharon
/********BGroup.java****************
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.image.TextureLoader;
public class BGroup extends BranchGroup
public BGroup()
/*create the transformGroup and set the capability to write.needed for rotation*/
TransformGroup someGroup = new TransformGroup();
someGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
//add the transform group to the branchgroup
this.addChild(someGroup);
//create the sphere and add it to the scene
Sphere mysphere = new Sphere(0.5f);
someGroup.addChild(mysphere);
// Create a light that shines for 100m from the origin
Color3f light1Color = new Color3f(7f, 2.6f, 4.1f);
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
Vector3f light1Direction = new Vector3f(9.0f, -7.0f, 5.0f);
DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction);
light1.setInfluencingBounds(bounds);
someGroup.addChild(light1);
Transform3D yAxis = new Transform3D();
     Alpha rotationAlpha = new Alpha(-1, 4000);
     RotationInterpolator rotator =
     new RotationInterpolator(rotationAlpha, someGroup, yAxis,
                    0.0f, (float) Math.PI*2.0f);
     rotator.setSchedulingBounds(bounds);
     someGroup.addChild(rotator);
this.compile();
*********************some1Canvas3D.java******************/
import java.awt.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import java.applet.*;
import java.awt.event.*;
import java.awt.event.WindowAdapter;
public class some1Canvas3D extends Applet {
private Button go = new Button ("Forward");
private Button go2 = new Button ("Left");
private Button go3 = new Button ("Right");
private Button go4 = new Button ("Back");
private Button go5 = new Button ("Do it for me !!!");
public void init()
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
Canvas3D c1 = new Canvas3D(config);
c1.setSize(256,256);
add("Center", c1);
SimpleUniverse simpleU = new SimpleUniverse(c1);
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(new BGroup());
Panel p = new Panel();
p.add(go);
p.add(go2);
p.add(go3);
p.add(go4);
p.setBackground(Color.blue);
p.setForeground(Color.red);
add("North",p);
Panel p2 = new Panel();
p2.add(go5);
p2.setBackground(Color.blue);
p2.setForeground(Color.red);
add("South",p2);
public void start() {
public void destroy() {
public void run() {
//Explains what happens when the Mouse is clicked on the Applet
public void actionPerformed(ActionEvent e) {
     if (e.getSource()==go ) {
/*when this button is pressed i want to be able to decrease the radius size of the sphere in BGroup.java*/
public static void main(String []args)
System.out.println("Program Started");
new MainFrame(new some1Canvas3D(), 750,500);
Thanks again.
Sharon.