I am playing with Node.getBounds() (for doing run-time transparency
ordering), and was expecting a different behavior out of the getBounds()
call. For example, if I make a 2x2x2 cube, I expect a bounding box to
be (-1,-1,-1) to (1,1,1). But then if I put a TransformGroup above the
shape with a translation transform of (50, 75, 0), I would expect the TG
to have the same size bounds, except translated. This is not what I
get.
Looking at the below output and code, can someone (at Sun?) help me with
this? It looks like it's the bounds of the child, not the node itself.
I understand the change from bounding box to bounding sphere, but not
why the TG bounds are located at 0,0,0.
BTW, how would (could) culling operations work successfully with this?
I don't think this is right at all... ;)
The output
---------------------------------------------------------
COLOR CUBE: bounds=Bounding box: Lower=-1.0 -1.0 -1.0 Upper=1.0 1.0 1.0
COLOR CUBE XFORM: bounds=Center=(0.0, 0.0, 0.0)
Radius=1.7320508075688772
GROUP: bounds=Center=(50.0, 75.0, 0.0) Radius=1.7320508075688772
The code
----------------------------------------------------------
// The color cube (2x2x2) centered at 0,0,0
Shape3D s = new com.sun.j3d.utils.geometry.ColorCube();
System.out.println("COLOR CUBE: bounds=" + s.getBounds() );
// A transform to move the cube to 50,75
Transform3D sxform = new Transform3D();
sxform.setTranslation(new Vector3f(50f, 75f, 0f));
TransformGroup sgrp = new TransformGroup( sxform );
sgrp.addChild( s );
System.out.println("COLOR CUBE XFORM: bounds=" + sgrp.getBounds() );
// Put the TG in a group (shouldn't have to do this)
Group g2 = new Group();
g2.addChild( sgrp );
System.out.println("GROUP: bounds=" + g2.getBounds() );
J. Lee Dixon
SAIC - Celebration, FL
321-939-7917
[EMAIL PROTECTED] AOL: LeeOrlando
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