I have a canvas with several 3D spheres generated from my own Sphere3d class
which itself is a BranchGroup and has a translation TransformGroup attached
to it and then a Primitive of the Sphere attached to it. I want to select
the individual spheres and tell my program which sphere it is...using the
code below I implemented the MousePickBehavior but found that I have a lot
of inconsistency in picking the objects. Sometimes I click on a sphere and
I pick it, other times I getting nothing at all...if I rotate the scene
around
then sometime I can get the sphere again. It seems like the picking is
going very well. I tried also using PRIMITIVE instead of SHAPE3D for
my 'pickResult.getNode(PickResult.SHAPE3D)' but with similar results.
Additionally I tried using the BRANCH_GROUP but I could not select anything
at all.
My questions are:
1) Have any of you found inconsistency in your picking?
2) How can I get the BRANCH_GROUP pickResult to work so that I can
directly get the node instead of using User defined data attached to
the Sphere?
3) Do you think using a VirtualUniverse, instead of SimpleUniverse
affects
the results? I tested this but could not find an issue.
4) Does anyone have a better picking system/code or simply can give me
insight on how to fix the one I have...by the way, the code below is
entirely from the java3D demos and I only added some print lines.
thanks,
Mario
-------------------------------------------------------------------------
PickHighlightBehavior pickBeh = new PickHighlightBehavior(canvas3D,
objRoot, bounds);
-------------------------------------------------------------------------
/*
* @(#)PickHighlightBehavior.java 1.15 02/04/01 15:03:24
*
* Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
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*
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* notice, this list of conditions and the following disclaimer.
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* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
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* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
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import javax.media.j3d.*;
import com.sun.j3d.utils.picking.PickTool;
import com.sun.j3d.utils.picking.PickResult;
import com.sun.j3d.utils.picking.behaviors.PickMouseBehavior;
import java.util.*;
import java.awt.*;
import java.awt.Event;
import java.awt.AWTEvent;
import java.awt.event.MouseEvent;
import javax.vecmath.*;
import com.sun.j3d.utils.picking.PickIntersection;
public class PickHighlightBehavior extends PickMouseBehavior {
Appearance savedAppearance = null;
Shape3D oldShape = null;
Appearance highlightAppearance;
public PickHighlightBehavior(Canvas3D canvas, BranchGroup root, Bounds
bounds) {
super(canvas, root, bounds);
this.setSchedulingBounds(bounds);
root.addChild(this);
Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
Color3f black = new Color3f(0.0f, 0.0f, 0.0f);
Color3f highlightColor = new Color3f(0.0f, 1.0f, 0.0f);
Material highlightMaterial = new Material(highlightColor, black,
highlightColor, white,
80.0f);
highlightAppearance = new Appearance();
highlightAppearance.setMaterial(new Material(highlightColor, black,
highlightColor, white,
80.0f));
pickCanvas.setMode(PickTool.BOUNDS);
}
public void updateScene(int xpos, int ypos) {
PickResult pickResult = null;
Shape3D shape = null;
pickCanvas.setShapeLocation(xpos, ypos);
Point3d eyePos = pickCanvas.getStartPosition();
System.out.println("EYE: "+eyePos);
pickResult = pickCanvas.pickClosest();
if (pickResult != null) {
shape = (Shape3D) pickResult.getNode(PickResult.SHAPE3D);
System.out.println(" Shape: "+shape);
}
if (oldShape != null){
oldShape.setAppearance(savedAppearance);
}
try {
if (shape != null) {
savedAppearance = shape.getAppearance();
oldShape = shape;
shape.setAppearance(highlightAppearance);
}
} catch ( Exception e ) { System.out.println(" Caught E ");}
}
}
-------------------------------------------------------------------------
Mario
Mariusz Zaczek
NASA - Johnson Space Center
Automated Vehicles and Orbit Analysis / DM35
Flight Design and Dynamics Division
Mission Operations Directorate
Bldg: 30A Room: 3040A
Disclaimer: "The opinions, observations and comments expressed in my email
are strictly my own and do not necessarily reflect those of
NASA."
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