Collision prevension using picking

Question

Hi everybody:
i am working on a java 3d game demo which uses picking as the collision avoidance utility.the code below is quite simple but in fact it cant pick anything. the problem has made me crazy for quite a long time and i still not find out the correction answer.if anyone could solve this problem ,i will be very thankful~ :)
public class TestBound extends Applet {
BranchGroup root;
public void createBranchGraph() {
root = new BranchGroup();
TransformGroup rootTG = new TransformGroup();
rootTG.addChild(new ColorCube(0.4));
root.addChild(rootTG);
//root.setPickable(true);
//root.setCapability(Node.ALLOW_BOUNDS_READ);
//root.setCapability(Node.ENABLE_PICK_REPORTING);
root.compile();
public TestBound() {
setLayout(new BorderLayout());
Canvas3D canvas = new
Canvas3D(SimpleUniverse.getPreferredConfiguration());
add("Center",canvas);
createBranchGraph();
SimpleUniverse su = new SimpleUniverse(canvas);
su.getViewingPlatform().setNominalViewingTransform();
su.addBranchGraph(root);
//System.out.println(new BoundingBoxGenerator(scene).getBounds());
public static void main (String[] args) {
TestBound tb = new TestBound();
new JMainFrame (tb,256,256).setVisible(true);
PickTool tool = new PickTool(tb.root);
tool.setShapeRay(new Point3d(1000,0,0),new Vector3d(-1,0,0));
System.out.println(tool.pickAny() == null);
the picking ray should intersect with the color cube,but in fact it cant pick anything and returns null always.

Answer 1

When you post code, please use[code] and [/code] tags as described in Formatting Help on the message entry page. It makes it much easier to read.