Hi, I have the following code to read in values from �cube.obj� and output a
cube from this.
import com.sun.j3d.loaders.*;
import com.sun.j3d.loaders.objectfile.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.*;
import java.awt.event.*;
public class ObjectLoader extends Frame implements ActionListener {
protected Canvas3D myCanvas3D = new Canvas3D(null);
protected Button myButton = new Button("Exit");
protected String filename = null;
// String[] InputFile = new String[cube.obj];
protected BranchGroup buildViewBranch(Canvas3D c) {
BranchGroup viewBranch = new BranchGroup();
Transform3D viewXfm = new Transform3D();
viewXfm.set(new Vector3f(0.0f,0.0f,10.0f));
TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
ViewPlatform myViewPlatform = new ViewPlatform();
PhysicalBody myBody = new PhysicalBody();
PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
viewXfmGroup.addChild(myViewPlatform);
viewBranch.addChild(viewXfmGroup);
View myView = new View();
myView.addCanvas3D(c);
myView.attachViewPlatform(myViewPlatform);
myView.setPhysicalEnvironment(myEnvironment);
return viewBranch;
}
protected void addLights(BranchGroup b) {
BoundingSphere bounds = new
BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
Color3f ambientColour = new Color3f(1.0f, 1.0f, 1.0f);
AmbientLight ambLight = new AmbientLight(ambientColour);
ambLight.setInfluencingBounds(bounds);
b.addChild(ambLight);
}
protected BranchGroup buildContentBranch (Node shape) {
BranchGroup contentBranch = new BranchGroup();
Transform3D rotateCube = new Transform3D();
rotateCube.set(new AxisAngle4d(1.0,1.0,0.0,Math.PI/4.0));
TransformGroup rotationGroup = new TransformGroup(rotateCube);
contentBranch.addChild(rotationGroup);
rotationGroup.addChild(shape);
addLights(contentBranch);
return contentBranch;
}
protected Node buildCube() {
ObjectFile f = new ObjectFile();
Scene s = null;
try {
s = f.load(filename);
}catch(Exception e) {
System.exit(1);
}
return s.getSceneGroup();
}
public void actionPerformed(ActionEvent e) {
dispose();
System.exit(0);
}
public ObjectLoader(String args[]) {
if (args.length > 0) {
filename = args[0];
VirtualUniverse myUniverse = new VirtualUniverse();
Locale myLocale = new Locale(myUniverse);
myLocale.addBranchGraph(
buildViewBranch(myCanvas3D));
myLocale.addBranchGraph(
buildContentBranch(buildCube()));
setTitle("ObjectLoader");
setSize(400,400);
setLayout(new BorderLayout());
add("Center", myCanvas3D);
myButton.addActionListener(this);
add("South", myButton);
setVisible(true);
}
}
public static void main (String[] args) {
String[] InputFile = {"cube.obj"};
ObjectLoader sw = new ObjectLoader(InputFile);
}
}
The input file is a normal txt file called �cube.obj�, it contains the
following
v 1.0 1.0 1.0
v -1.0 1.0 1.0
v -1.0 -1.0 1.0
v 1.0 -1.0 1.0
v 1.0 1.0 -1.0
v -1.0 1.0 -1.0
v -1.0 -1.0 -1.0
v 1.0 -1.0 -1.0
f 1 2 3 4
f 8 7 6 5
f 1 4 8 5
f 6 7 3 2
f 1 5 6 2
f 7 8 4 3
But when I try to run the program I get the following error
java.lang.IllegalStateException: PhysicalBody is null
at javax.media.j3d.View.checkView(View.java:2782)
at
javax.media.j3d.ViewPlatformRetained.setLive(ViewPlatformRetained.java:280)
at javax.media.j3d.GroupRetained.childDoSetLive(GroupRetained.java:2083)
etc
When I compile the code I do not get an error. Do you know what could be
the reason for this, is it because of the format of the file I am reading
in. Also do you know how I could read colour values from the file and then
set the cube equal to this colour.
Any help would be appreciated.
Thanks.
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