一段有用的java3d代码，演示了java3d鼠标滑过对象事件。

 -------------------MouseOverBehavior.java--------------------


import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.media.j3d.*;
import javax.vecmath.*;

import com.sun.j3d.utils.picking.*;

public class MouseOverBehavior extends Behavior {

private PickCanvas pickCanvas;
private PickResult pickResult;
private Appearance pickedShapeOldApp, cyanApp;
private Node pickedNode;
private boolean isObjectSelectedBefore = false;
private Shape3D pickedShape;
private Shape3D oldPickedNode = new Shape3D ();
private BranchGroup dataBranchGroup;
private Cursor savedCursor;
private Canvas3D canvas;
private boolean overAnObject = false;

private BranchGroup shapeLabelBG = new BranchGroup ();

public MouseOverBehavior (Canvas3D canvas, BranchGroup dataBranchGroup) {
this.canvas = canvas;
this.dataBranchGroup = dataBranchGroup;

pickCanvas = new PickCanvas (canvas, dataBranchGroup);
pickCanvas.setTolerance (1.0f);
pickCanvas.setMode (PickCanvas.GEOMETRY_INTERSECT_INFO);

Color3f objColor = new Color3f (0.8f, 0.8f, 0.0f);
Color3f black = new Color3f (0.0f, 0.0f, 0.0f);
Color3f white = new Color3f (1.0f, 1.0f, 1.0f);

cyanApp = new Appearance ();
objColor = new Color3f (0.0f, 0.8f, 0.8f);
cyanApp.setMaterial (new Material (objColor, black, objColor, white, 10.0f));
cyanApp.setTransparencyAttributes (new TransparencyAttributes (TransparencyAttributes.NICEST, 0.3f));

}

public void initialize () {
wakeupOn (new WakeupOnAWTEvent (MouseEvent.MOUSE_MOVED));
}

public void processStimulus (Enumeration criteria) {
WakeupCriterion wakeup;
AWTEvent[] event;
int eventId;

while (criteria.hasMoreElements ()) {
wakeup = (WakeupCriterion) criteria.nextElement ();

if (wakeup instanceof WakeupOnAWTEvent) {
event = ((WakeupOnAWTEvent) wakeup).getAWTEvent ();

for (int ii = 0; ii < event.length; ii++) {
eventId = event[ii].getID ();

if (eventId == MouseEvent.MOUSE_MOVED) {
int x = ((MouseEvent) event[ii]).getX ();
int y = ((MouseEvent) event[ii]).getY ();

pickCanvas.setShapeLocation (x, y);

try {
pickResult = pickCanvas.pickClosest ();

if (pickResult != null) {
pickedNode = ((Shape3D) pickResult.getNode (PickResult.SHAPE3D));
pickedShape = ((Shape3D) pickedNode);

//I will need this part in the future for
// details of the MouseOver shape.
// pickedNode.getLocalToVworld (testTransform);
// testTransform.get (objectPosToVW);
// System.out.println (testTransform);

if (isObjectSelectedBefore) {
if (oldPickedNode == null) {
oldPickedNode = pickedShape;
pickedShapeOldApp = pickedShape.getAppearance ();
canvas.setCursor (Cursor.getPredefinedCursor (Cursor.CROSSHAIR_CURSOR));
System.out.println ("Mouse Over - object is selected before");

} else {
((Shape3D) oldPickedNode).setAppearance (pickedShapeOldApp);
oldPickedNode = pickedShape;
pickedShapeOldApp = ((Shape3D) pickedNode).getAppearance ();
((Shape3D) pickedNode).setAppearance (cyanApp);
canvas.setCursor (Cursor.getPredefinedCursor (Cursor.CROSSHAIR_CURSOR));
overAnObject = true;
System.out.println ("Mouse Over - object is not selected before");

}
}
isObjectSelectedBefore = true;
} else if (overAnObject) {
canvas.setCursor (Cursor.getPredefinedCursor (Cursor.DEFAULT_CURSOR));
oldPickedNode.setAppearance (pickedShapeOldApp);
System.out.println ("pickResult is null");
overAnObject = false;
}
} catch (CapabilityNotSetException e) {
e.printStackTrace ();

}
}
}
}
}
wakeupOn (new WakeupOnAWTEvent (MouseEvent.MOUSE_MOVED));
}
}