It looks like you may have found a bug in our stuff. It should
work they way you have it set up. BTW, we don't use the scene
graph bounds in our internal processing. We create different bounds
hierarchies.
Doug Twilleager
Sun Microsystems
>MIME-Version: 1.0
>Subject: [JAVA3D] More Bounds questions
>To: [EMAIL PROTECTED]
>
>Okay, here's another question on Bounds that I haven't figured out yet.
>
>I finally figured out that to get the bounds of a Shape3D (or any Node)
>in virtual world coordinates, to do the following:
>
>void printBounds( Node n )
>{
> Bounds b = new BoundingSphere( n.getBounds() );
> Transform3D xform = new Transform3D();
> n.getLocalToVworld( xform );
> b.transform( xform );
>
> System.out.println( "NODE " + node + " nchildren=" +
>node.numChildren() );
> System.out.println( " bounds=" + b );
>}
>
>This works to show me the true bounds of my shape. Now, I have a scene
>graph that looks like:
>
> TG (instance)
> |
> TG (pivot)
> |
> G (group)
> |
> Shape3D
>
>Since I compute the bounds of the shape in vworld coords, it include the
>2 TG's above. Thus, the bounds for each node shown in my scene graph
>SHOULD BE EXACTLY THE SAME, but it's not:
>
>NODE javax.media.j3d.TransformGroup@78aa80 nchildren=1
> bounds=Center=(37.001460210540245, 217.4887110348027,
>50.68139838796939) Radius=33.7654125608372 NODE
>javax.media.j3d.TransformGroup@1d98a nchildren=1
> bounds=Center=(8.189181655713963, 179.66457649987368,
>37.125225898632465) Radius=48.28454144558632 NODE
>javax.media.j3d.Group@712651 nchildren=1
> bounds=Center=(8.189181655713963, 179.66457649987368,
>37.125225898632465) Radius=48.28454144558632 NODE
>javax.media.j3d.Shape3D@aab40
> bounds=Center=(8.189181655713963, 179.66457649987368,
>37.125225898632465) Radius=48.28454144558632
>
>How could a transform group change the bounds if it only has one child??
>Again, the bounds computed for each node INCLUDES the transforms above
>it using the code I have shown.
>
>J. Lee Dixon
>SAIC - Celebration, FL
>321-939-7917
>[EMAIL PROTECTED] AOL: LeeOrlando
>
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