Elisabeth,
Most likely you are seeing the difference between the branchgroup being
"live" vs not live. From the code you sent it does appear that you set
the capabilities to allow the transform to be written but it's not clear
exactly when this occurs (i.e. is the "test" branchgroup attached to a
live scene before you call any of these routines?).
You state that "setLabel()" works fine, that would indicate that your
branchgroup is not live when setLabel() is called. With a quick look at
your code I don't see anything specifically wrong.
- John Wright
Starfire Research
Elisabeth Thorsen wrote:
>
> Hi,
> I would like to change the position of a (Raster) label (by changing Transform3D,
>see method updateLabel() below), but setTransform makes the old label vanish and
>there is no label at the new position.
> However, if I detach the Branchgroup, change the transform exactly the same way as
>before, and then add the Branchgroup to its parent again, it works fine. (The label
>is created using the RasterTextLabel class from j3d.org).
> As you can see from the submitted "code" the calculation of scale and translate
>vector for Transform3D is exactly the same in the two cases described above (see
>updateTransform3D() method).
>
> Group (parent)
> |
> BranchGroup (being detached)
> |
> TransformGroup (where I would like to change the
> Transform3D by using setTransform)
> |
> RasterTextLabel (Shape3D)
>
> Does anyone know why this happens?
>
> Thanks in advance!
>
> Elisabeth Thorsen
>
> public class test extends Branchgroup {
>
> blah blah
> ...
>
> publid test(){
> blah blah blah
> setLabel();
> }
>
> // this works fine
> private void setLabel() {
> _labelShape =
> new RasterTextLabel(text,Color.white, false, true, x, y, z);
> _transGroup = new TransformGroup();
> _transGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
> _transGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
> _transGroup.setTransform(updateTransform3D());
> _transGroup.addChild(_labelShape);
> addChild(_transGroup);
> }
> }
>
> private void updateLabel(){
> detach(); // ** if this is commented out setTransform
> // only makes the label at the old position vanish
>
> _labelShape.crop();
> _labelShape.getRaster().setPosition(newPosition);
> _labelShape.setText(newText);
>
> // this has no effect if the branchgroup to which it is
> // attached isn't detached from its parent
> _transGroup.setTransform(updateTransform3D());
>
> _parent.addChild(this); // see **
> }
>
> public Transform3D updateTransform3D(){
>
> Transform3D trans = new Transform3D();
> double dist = (double) newDistance;
> double scale = 0.01d*(dist/7.5d);
> Vector3d tmpVector = new Vector3d();
> tmpVector.set((1.0d-scale)*x,(1.0d-scale)*y,(1.0d-scale)*.z);
> trans.set(scale, tmpVector);
> System.err.println(scale + ", " +tmpVector);
> return trans;
> }
>
> and more methods..
>
> }
>
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