Hi Mario
I have not done a huge amount of work with picking but I have noticed some
funny things going on. much the same as others on here. I have found that
there are diffrences between:
pickCanvas.setMode(PickTool.BOUNDS);
and
pickCanvas.setMode(PickTool.GEOMETRY_INTERSECT_INFO);
or
pickCanvas.setMode(PickTool.GEOMETRY);
especially when using pickClosest();
have you looked into the diffrences with these three modes of picking?
I am using a pickMouseBehavior to selected imported Vrml shapes and adding or
deleting them from my scene eventually build a larger shape. and find that
at diffrent times I have to use PickTool.BOUNDS and at other times I have to
use PickTool.GEOMETRY_INTERSECT_INFO!!! I do not undersatnd why this is but
assume it is something to do with the way the closest is calculated!
I hope this helps though I doubt it will! I sure others on this list can
explain better than I.
C YA Phil :)
>===== Original Message From Discussion list for Java 3D API
<[EMAIL PROTECTED]> =====
>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.
> *
> * Redistribution and use in source and binary forms, with or without
> * modification, are permitted provided that the following conditions
> * are met:
> *
> * - Redistributions of source code must retain the above copyright
> * notice, this list of conditions and the following disclaimer.
> *
> * - 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.
> *
> * 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
> * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
> * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
> * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
> * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
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> * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
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> * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
> * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE,
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> * You acknowledge that Software is not designed,licensed or intended
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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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Philip J Colbert
Software Engineer
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