Only Daniel Selman sent an answer. I want to ask a question, could anyone tell me, is it a bug for PickTranslateBehavior?Am I write a new "PickTranslateBehavior" class like Selman did? nagehan
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John,
I discuss this very problem in my book, and have coded some replacements for the SUN mouse behaviors.
You can grab the source from the Manning website. They are called TornadoMouseRotate, TornadoMouseTranslate etc. The example to run is called MouseNavigateTest:
/**
* This example illustrates the mouse behaviors defined in the
* org.selman.java3d.book package. These improved mouse
* behaviors:
* - handle TransformGroups above the target TG properly <br>
* - can be applied to any object, not just TGs <br>
* - support interface reporting to give easy feedback on all manipulations
<br>
* - better motion speed control <br>
* - range validation to clamp scales and translation between limits <br>
*/
public class MouseNavigateTest extends Java3dApplet
implements ScaleChangeListener, RotationChangeListener,
TranslationChangeListener...
Sincerely,
Daniel Selman
Author - "Java 3D Programming" http://www.manning.com/selman
-----Original Message----- From: Discussion list for Java 3D API [mailto:[EMAIL PROTECTED] Behalf Of John O'Hara Sent: Tuesday, March 19, 2002 5:06 PM To: [EMAIL PROTECTED] Subject: PickTranslationBehavior and Building 3D Surfaces
Hello all,
I was hoping someone good give me some direction in dealing with the PickTranslateBehavior in Java3D.
I have a 3D scene graph with a 16 spheres (representing control points on a surface). To this I have attached a pickTranslateBehavior on the root, so I can move any of the spheres.
However, in the scene graph, I also have a MouseRotate and MouseZoom behavior attached to the root graph to allow the user to view the surface from any angle.
My problem is as follows:
If I rotate around the scene so I am looking at the scene from somewhere other than the XY plane, the PickTranslateBehavior does not adjust itself. For example. In its initial state, I can grab a sphere and move it up, down, left, right, and it will follow the mouse, as expected. However, if I rotate the scene 180 degrees and flip, the translation does not adjust. In this case, picking a sphere and dragging the mouse right will move the sphere left. Dragging up moves the sphere down, etc.
Is there a way I can configure the PickTranslateBehavior to always move the selected object in a plane which is parallel to the view?
Thanks for your help,
John O'Hara
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