Hi,
I have been trying to use the PickSegment and PickRay
function in Java3D. For some reason, I can't get them
to work properly - I don't get a scene graph path
returned at all. I don't know what could be wrong ...
I have modify the HelloUniverse applet by adding a few
lines to do the test and have attached the applet with
this message. I am just trying get the PickSegment to
detect the color cube or not in this example.
Thanks in advance,
------------------------------------
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.event.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
public class HelloUniverse extends Applet {
private SimpleUniverse u = null;
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create the TransformGroup node and initialize it
to the
// identity. Enable the TRANSFORM_WRITE capability so
that
// our behavior code can modify it at run time. Add
it to
// the root of the subgraph.
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
// Create a simple Shape3D node; add it to the scene
graph.
ColorCube cube = new ColorCube(0.2);
/****************************************
* My modification
****************************************/
cube.setPickable (true);
objTrans.addChild(cube);
// Create a new Behavior object that will perform the
// desired operation on the specified transform and
add
// it into the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, 4000);
RotationInterpolator rotator =
new RotationInterpolator(rotationAlpha, objTrans,
yAxis,
0.0f, (float) Math.PI*2.0f);
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0),
100.0);
rotator.setSchedulingBounds(bounds);
objRoot.addChild(rotator);
// Have Java 3D perform optimizations on this
scene graph.
objRoot.compile();
return objRoot;
}
public HelloUniverse() {
}
public void init() {
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
add("Center", c);
// Create a simple scene and attach it to the virtual
universe
BranchGroup scene = createSceneGraph();
u = new SimpleUniverse(c);
// This will move the ViewPlatform back a bit
so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(scene);
/****************************************
* My modifications
****************************************/
SceneGraphPath closestHit = null;
PickSegment collisionPicker = new PickSegment (new
Point3d(-1,0,0), new Point3d(1,0,0));
PickRay collisionRay =new PickRay (new
Point3d(0,0.5,0), new Vector3d (0,-0.5,0));
closestHit =
collidables.pickClosest(collisionPicker);
//closestHit = scene.pickAny(collisionPicker);
//closestHit = scene.pickAny(collisionRay);
if (closestHit == null){
System.out.println ("No Intersection");
}
}
public void destroy() {
u.removeAllLocales();
}
//
// The following allows HelloUniverse to be run as
an application
// as well as an applet
//
public static void main(String[] args) {
new MainFrame(new HelloUniverse(), 256, 256);
}
}
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