All of the predefined pick and mouse behaviors operate on
TransformGroup nodes rather than shape nodes. You will need to provide
your own behaviors--using the existing behaviors as a starting point,
if you wish--that operate on the vertices of a geometry object. As
long as you set the corresponding capability bits, you can modify the
coordinates of a live geometry objects at runtime. Just use the
GeometryArray.setCoordinate method to alter the position of your
vertex. If you need to apply a transformation to the existing position
to compute the new position, you can use the Transform3D.transform
method.
--
Kevin Rushforth
Java 3D Team
Sun Microsystems
[EMAIL PROTECTED]
>Date: Fri, 12 Feb 1999 11:27:05 +0000 (GMT)
>From: Tim Needham <[EMAIL PROTECTED]>
>To: "Sean J. Miller" <[EMAIL PROTECTED]>
>cc: Java 3D Interest Group <[EMAIL PROTECTED]>
>
>Hi,
>
>Yes that's one consideration but I also wish to interact with my shapes on
>a vertex level. Roughly - each shape type has a getVertex(PickRay) or
>similar and a setVertex(Point3d, Vector3d) or similar, to get the vertex
>nearest to the ray and then to alter it by the mouse drag amount.
>
>I think this might be a question for the Java3D team though as vertex
>manipulation appears to me to have been abstracted away from the user -
>there are so many things in the way of doing it nicely or cleanly.
>
>ie - is it the case that when a shape is transformed, by say a standard
>pick behaviour, that the transform group gets all the changes and that the
>vertex information inside the shape remains constant? If so then I need to
>apply the transforms explicitly to the vertices and not to the transform
>group.
>
>Basically, I just want to stick a cube on the screen, move it around and
>then drag individual points around to change its shape.
>
>Thanks,
>
>Tim.
>
>,----------------------------------------------------------------------.
>| Tim Needham. |
>| OU Computer Society President. |\ ___,,--,_ __ |
>| [EMAIL PROTECTED] /,`--'' \`,,__,',-'|
>| http://ox.compsoc.net/~timothy |,4 ) )_ ) /~-----' |
>`------------------------------------------'---^~(_/-_)--(_/_)---------'
> Q: Why did the chicken cross the Moebius strip?
> A: To get to the other ... er, um ...
>
>On Thu, 11 Feb 1999, Sean J. Miller wrote:
>
>> Hello,
>>
>>
>> If I understand you right, you want to be able to "pick" individual
>> transforms within a Scenegraph and manipulate them by rotation, translation,
>> and zoom.
>
>---Clipped---
>
>>
>> Attached is the revamped PickRotateBehavior.
>>
>> Good luck,
>> Sean
>>
>>
>>
>>
>>
>>
>
>
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