Eric,
Given the TransformGroup from the callback, couldn't you simply do one of
the following:
- Assign the real target shape as a userData on the TransformGroup. That
way instead of iterating through your list you simply just get the userData
and it holds the reference to your shape. Or, if that won't work:
- Walk the tree down from the TG (assumes you've set capabilities properly)
and update the object(s) appropriately.
Why maintain a separate structure when J3D is doing this and has additional
capabilities for doing this?
--Mark
At 11:38 AM 3/23/2001 -0500, you wrote:
>If you do it using the method I use, you need to look at the callback
>methods of the picking behaviors. But first, you say when someone picks
>object A, you want to change the color of object Qa. So is there a direct
>correspondence from object A to Qa and from B to Qb and from C to Qc, and
>so on and so on.
>
>The reason I ask is that if you use the callback methods of the picking
>behaviors, they return the TransformGroup of the object clicked. This
>means that you have to determine which object was picked by matching the
>correct TransformGroup.
>
>For example, if you click on say object B, and assuming object A and B and
>C ... all have separate TransformGroups, then you now have the
>TransformGroup for object B. But you don't know it is for object B, you
>just have a TransformGroup. You then need to match this TransformGroup
>with the correct TransformGroup, in this case the TransformGroup of Object
>B. Once you know it is object B, you can then say change the color of
>object Qb provided you have a one to one correspondence with (A,B,C,....)
>and (Qa,Qb,Qc,....).
>
>
>There may be a pure Java3D way to do the above but the way I implemented
>this is that I kept a link to all of my objects in a Vector java type. The
>objects in the vector aren't directly JAva3D objects either. This Vector
>kept a bunch of non-Java3D related information about the objects as well as
>the Java3D object itself.
>
>If you look at my web page closely, pay particular attention to the
>PickSelection Behavior. When someone clicks on an object, the
>PickSelection behavior triggers a Callback and from the Callback I get a
>TransformGroup for the object I clicked on. I then enumerate through all
>of my privately create objects in the vector and look at the
>TransformGroup of the Java3D object, when I find a match, I know I have the
>right object. I can then change the name of the object ( a non-Java3D
>property of my private class object).
>
>The reason i think this is necessary is that since you are clicking on one
>thing and wanting to change the color of something else that corresponds to
>that object, you will need to have a separate data structure like a lookup
>table that says when I give you A give me back Qa so i can change it's color.
>
>I have my behaviors on my web page but I am not sure that I have the
>callback class that is in my main class on the web page. I can email that
>to you if you want it. It is actually very straight forward and short.
>
>I hope this helps.
>
>
>
>At 11:31 AM 03/23/2001 +0100, you wrote:
>>Hi Eric,
>>
>>Firstly I would like to congratulate you about you homepage and work.
>>
>>Really I don't know if you could help me about a java3D issue.
>>
>>My problem is that I have a lot of 3D object, so object A, B, C, etc;
>>e.g. - I
>>need to implement a code to change the color of the object Qa, when I
>>picked the
>>object A. Perhaps it would work with WakeupBehavior, but I can't find
>>some a way
>>to link the WakeupBehavior with the pick something.
>>
>>Some hints ? ....|:0).
>>Thnx in advance. Adriano
>>--
>>+------------------------------------------------------+
>>| Adriano Cavalcanti Silva |
>>| Research Assistant |
>>| |
>>| Fraunhofer Institute - Computer Graphic Center |
>>| Graphic Information System Group / A5 |
>>| Rundeturmstr. 6 Darmstadt |
>>| Germany |
>>| |
>>| Tel: +49-6151-155-409 Fax: +49-6151-155-444 |
>>| http://www.igd.fhg.de email: [EMAIL PROTECTED] |
>>+------------------------------------------------------+
>
>***********************************************************************
>Eric N. Reiss
>MEMS Manager
>Swanson Center for Product Innovation
>Department of Mechanical Engineering
>School of Engineering - University of Pittsburgh
>
>3700 O'Hara Street
>647 Benedum Hall
>Pittsburgh, Pennsylvania 15261
>Phone: 412-624-9696
>FAX: 412-624-7701
>Email: [EMAIL PROTECTED]
>http://www.sigda.acm.org/Eric/
>***********************************************************************
>
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