Hi,
I have 2 polygons, each uses GeometryInfo to generate its indexedGeometryArray. A
BranchGroup is created to add both Shape3D objects into it. There are some problems:
(please see my code attached, you can try)
1. if I just add either of the 2 Shape3D objects into the BranchGroup, the bounding
center is just the same as I add all of them into the group, so I guess the Java3D
class calculate the bounding center using all of the vertices instead of only the
vertices the Geometry object refers to.
2. when I just add one of the polygons into the group, the picking for this polygon is
correct, but if I add both of them into the group, the picking for the first one is
not correct, the second one is correct.
3. Even when I just add one polygon into the group, if I use
PickCanvas.setShape(PickPoint, startPoint) before I use pickAllSorted(). I got a
Runtime exception: java.lang.RuntimeException: PointArray0
Could you please try my code? Did I have sth wrong or else? Thank you very much!
white
/*
* PickAllTest.java
*
* Created on July 23, 2002, 10:15 AM
*/
/**
*
* @author
*/
import javax.vecmath.*;
import javax.media.j3d.*;
import com.sun.j3d.utils.picking.PickTool;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
import java.awt.*;
public class PickAllTest extends javax.swing.JFrame {
/** Creates new form PickAllTest */
public PickAllTest() {
initComponents();
initGraphics();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
private void initComponents() {
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
}
});
pack();
java.awt.Dimension screenSize =
java.awt.Toolkit.getDefaultToolkit().getScreenSize();
setSize(new java.awt.Dimension(640, 480));
setLocation((screenSize.width-640)/2,(screenSize.height-480)/2);
}
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
}
private void initGraphics(){
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
canvas = new Canvas3D(config);
u = new SimpleUniverse(canvas);
imagePanel = new javax.swing.JPanel(new java.awt.BorderLayout());
getContentPane().add(imagePanel, java.awt.BorderLayout.CENTER);
imagePanel.add(canvas, java.awt.BorderLayout.CENTER);
BranchGroup scene = createSceneGraph();
ViewingPlatform viewingPlatform = u.getViewingPlatform();
Transform3D t = new Transform3D();
Point3d cp = new Point3d();
bounds.getCenter(cp);
System.out.println("The bounding center is "+cp.x+", "+cp.y+", "+cp.z);
t.set(new Vector3d(cp.x, cp.y, cp.z+2.5*bounds.getRadius()));
(viewingPlatform.getViewPlatformTransform()).setTransform(t);
u.addBranchGraph(scene);
imagePanel.updateUI();
}
private BranchGroup createSceneGraph(){
double vertices[] = {-2,-1,0, -1,-2,0, 0,-1,0, 0,1,0, -2,1,0, 2,-1,-1,
2,1,0};
Shape3D part1 = new Shape3D();
int []part1Index = {0, 1, 2, 3, 4};
int []stripCounts1 = new int[1];
int []stripCounts2 = new int[1];
stripCounts1[0] = part1Index.length;
GeometryInfo gi1 = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
gi1.setCoordinates(vertices);
gi1.setCoordinateIndices(part1Index);
gi1.setStripCounts(stripCounts1);
Stripifier st1 = new Stripifier();
st1.stripify(gi1);
IndexedGeometryArray ga1 = gi1.getIndexedGeometryArray();
ga1.setUserData("left polygon");
part1.setGeometry(ga1);
Appearance myApp1 = new Appearance();
ColoringAttributes colorAttr1 = new ColoringAttributes(0.5f, 0.4f, 0.0f,
ColoringAttributes.SHADE_GOURAUD);
myApp1.setColoringAttributes(colorAttr1);
part1.setAppearance(myApp1);
part1.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
part1.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
part1.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
PickTool.setCapabilities(part1, PickTool.INTERSECT_FULL);
Shape3D part2 = new Shape3D();
int []part2Index = {2, 5, 6, 3};
GeometryInfo gi2 = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
gi2.setCoordinates(vertices);
gi2.setCoordinateIndices(part2Index);
stripCounts2[0] = part2Index.length;
gi2.setStripCounts(stripCounts2);
Stripifier st2 = new Stripifier();
st2.stripify(gi2);
IndexedGeometryArray ga2 = gi2.getIndexedGeometryArray();
ga2.setUserData("right polygon");
part2.setGeometry(ga2);
Appearance myApp2 = new Appearance();
ColoringAttributes colorAttr2 = new ColoringAttributes(0.2f, 0.7f, 0.0f,
ColoringAttributes.SHADE_GOURAUD);
myApp2.setColoringAttributes(colorAttr2);
part2.setAppearance(myApp2);
part2.setCapability(Shape3D.ALLOW_APPEARANCE_READ);
part2.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE);
part2.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
PickTool.setCapabilities(part2, PickTool.INTERSECT_FULL);
BranchGroup group = new BranchGroup();
//Here is the interesting thing, try to comment out one of them or change the
order of them
//group.addChild(part2);
group.addChild(part1);
bounds = new BoundingSphere(group.getBounds());
PickAllMouseBehavior pick = new PickAllMouseBehavior(group, canvas, bounds);
pick.setEnable(true);
group.addChild(pick);
group.compile();
return group;
}
public static void main(String args[]) {
new PickAllTest().show();
}
// Variables declaration - do not modify
// End of variables declaration
private BoundingSphere bounds;
private SimpleUniverse u;
private Canvas3D canvas;
private javax.swing.JPanel imagePanel;
}
/*
* PickAllMouseBehavior.java
*
* Created on July 23, 2002, 1:26 PM
*/
/**
*
* @author
* @version
*/
import javax.vecmath.*;
import javax.media.j3d.*;
import com.sun.j3d.utils.picking.behaviors.PickMouseBehavior;
import com.sun.j3d.utils.picking.PickResult;
import com.sun.j3d.utils.picking.PickIntersection;
public class PickAllMouseBehavior extends PickMouseBehavior {
/** Creates new PickAllMouseBehavior */
public PickAllMouseBehavior(BranchGroup root, Canvas3D canvas, Bounds bounds) {
super(canvas, root, bounds);
this.setSchedulingBounds(bounds);
}
public void updateScene(int xpos, int ypos) {
if (!mevent.isMetaDown() && !mevent.isAltDown()){
pickCanvas.setShapeLocation(xpos, ypos);
PickResult pr = pickCanvas.pickClosest();
if(pr != null ){
GeometryArray g = pr.getGeometryArray();
String str = (String)(g.getUserData());
if(str != null)
System.out.println("This is the \""+str+"\" part!");
if(pr.numIntersections() > 0){
PickIntersection pi = pr.getIntersection(0);
if(pi != null){
Point3d localPt = pi.getClosestVertexCoordinates();
PickPoint pp = new PickPoint(localPt);
pickCanvas.setShape(pp, localPt);
}
PickResult[] pra = pickCanvas.pickAllSorted();
if(pra == null)
return;
System.out.println("The number of GeometryArrays picked is:
"+pra.length);
GeometryArray[] ga = new GeometryArray[pra.length];
}
}
}
}
}
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