1. 3D-Online Product Configuration by Java3D
Fachhochschule Stralsund
University of Applied Science
Prof.Dr.-Ing. Christine Wahmkow
Department of Mechanical Engineering
only Phylosophy of Java3D
and an easy example

2. Philosophy of Java3D – think in Scenegraph
3D-Online Product Configuration by Java3D
Philosophy of Java3D – think in Scenegraph
Virtual universe as the root
The virtual universe is described by a scenegraph
Each scenegraph has always only one rrot
The virrtual universe can have a lot of local objects.
Normally a 3D program has only one licale objekt
The locale object is a startpoint to which the virtual object get their position
A branchgroup is the root of a subgraph of the local tree
In maintenance there are 2 branchs: content and view branch
Content branch: describes the 3D virtual world (Geometry, Light Behavior, outfit of the objects)
View Branch: specifys how the world is showing
Here you can select options for thedifferent output devices
for normal PC‘s you can use default values
canvas3D : the surface where the object are rendered
Content Branch: is lived when he is hanging under the locale node
The developer has to describe the objects
Objects are living, if you set the necessary capabilities

3. Philosophy of Java3D – think in Scenegraph
3D-Online Product Configuration by Java3D
Philosophy of Java3D – think in Scenegraph
View Branch:
Very complex and complicated
But:
Java3D offers a utility class
The developer can concentrate on the virtual world

4. An easy recipe to produce a Java3D-application
3D-Online Product Configuration by Java3D
An easy recipe to produce a Java3D-application
create a subclass of class Applet public class HelloJava3D extends Applet
create a constructor for the subclass which then builds the virtual world public HelloJava3D()
define a method to create the Content branch public BranchGroup createSceneGraph()
call the applet in a MainFrame object in the main method of the applet public static void main(String[] args){ Frame frame=new MainFrame(new HelloJava3D(),400,400); }

5. An easy recipe to produce a constructor (scenegraph)
3D-Online Product Configuration by Java3D
An easy recipe to produce a constructor (scenegraph)
Create a Canvas3D object Canvas3D canvas3D=new Canvas3D(null);
Create a SimpleUniverse object, which has a reference to the canvas3D SimpleUniverse simpleU=new SimpleUniverse(canvas3D); simpleU.getViewingPlatform().setNominalViewingTransform();
Create the Content branch BranchGroup scene=createScenegraph();
Compile the Content branch scene.compile();
Add the Content branch to the locale object of the SimpleUniverse simpleU.addBranchgraph(scene); 2 5 1 4 3

6. 3D-Online Product Configuration by Java3D
The constructor
public class HelloJava3D1 extends Applet {
public HelloJava3D1() {
setLayout(new BorderLayout());
Canvas3D canvas3D = new Canvas3D(null);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph();
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
// This will move the ViewPlatform back a bit so the objects in the scene can be viewed.
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
} // end of HelloJava3D1 (constructor)

7. 3D-Online Product Configuration by Java3D
The content branch
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
objRoot.compile();
return objRoot;
} // end of CreateSceneGraph method of HelloJava3D1
// The following allows this to be run as an applicationas well as an applet
public static void main(String[] args) {
Frame frame = new MainFrame(new HelloJava3D1(), 256, 256);
} // end of main (method of HelloJava3D1)

8. 3D-Online Product Configuration by Java3D
import java.applet.Applet import java.awt.BorderLayout; import java.awt.Frame; import java.awt.event.*; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.universe.*; import com.sun.j3d.utils.geometry.ColorCube; import javax.media.j3d.*; import javax.vecmath.*;

9. 3D-Online Product Configuration by Java3D
The expanded content branch
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
objRoot.compile();
return objRoot;
} // end of CreateSceneGraph method of HelloJava3D1
objRoot.addChild(new ColorCube(0.4));

10. Mouse behavior BranchGroup objRoot = new BranchGroup();
TransformGroup objTransform = new TransformGroup();
objTransform.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTransform.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objRoot.addChild(objTransform);
objTransform.addChild(new ColorCube(0.4));
MouseRotate myMouseRotate = new MouseRotate();
myMouseRotate.setTransformGroup(objTransform);
myMouseRotate.setSchedulingBounds(new BoundingSphere());
objTransform.addChild(myMouseRotate);
MouseTranslate myMouseTranslate = new MouseTranslate();
myMouseTranslate.setTransformGroup(objTransform);
myMouseTranslate.setSchedulingBounds(new BoundingSphere());
objTransform.addChild(myMouseTranslate);
MouseZoom myMouseZoom = new MouseZoom();
myMouseZoom.setTransformGroup(objTransform);
myMouseZoom.setSchedulingBounds(new BoundingSphere());
objTransform.addChild(myMouseZoom); objRoot.compile(); return objRoot;
Add the packages:
import com.sun.j3d.utils.behaviors.mouse.*;
import java.awt.event.*;
import java.util.Enumeration;

11. AWT-Interaction- example to change the background color
Additional packeges:
import java.awt.*;
import java.awt.event.*;
import java.util.Enumeration;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
Background define in the Content branch
bg=new Background();
bg.setCapability(bg.ALLOW_COLOR_READ);
bg.setCapability(bg.ALLOW_COLOR_WRITE);
bg.setColor(0.0f,0.0f,0.0f); //black
bg.setApplicationBounds(new BoundingSphere());
objTransform.addChild(bg);
AWT Interaction by an additional method
public void actionPerformed(ActionEvent e ) {
if (e.getSource()==Backg){
bg.setColor(0.0f,0.0f,0.8f); //blue }

12. AWT-Interaction- example to change the rotation speed of the cube
Alpha define // Alpha as an object of time
Alpha rotationAlpha;
rotationAlpha=new Alpha(-1,rottime);
RotationInterpolator rotator= new RotationInterpolator(rotationAlpha,objTransform);
BoundingSphere bounds=new BoundingSphere();
rotator.setSchedulingBounds(bounds);
objTransform.addChild(rotator);
public void actionPerformed(ActionEvent e ) {
if (e.getSource()==RottimeP){
rottime=rottime+2000;
rotationAlpha.setIncreasingAlphaDuration(rottime); }
if (e.getSource()==Rotstop){
rotationAlpha.setLoopCount(0); }