Add your cone to a TransformGroup, set the capabilities of the TransformGroup
 
tg.setCabability(TransformGroup.ALLOW_TRANSFORM_WRITE);
 
And then, when the branchgroup becomes live, you can use something like:
 
Transform3D t=new Transform3D();
tg.getTransform(t);
t.setScale(....float...);
tg.setTransform(t);
 
Cristian
 
 
 
<<Hi, dear all:

Is there any way to change the size of a Cone object in a live scene
without using detaching/retaching BranchGroup?
I mean like using Geometry By  Reference, you can change vertex corrdinates
on fly without adding the object under a BranchGroup, here I want to change
the height and radius of the cone.

I would like to confirm this conclusion. So that I will start another
approach to model my objects.

Thanks much in advance!>>

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