in the call to the constructor, the attribute bundle is initialized to Nil.
TGraphicGroup3D( TGrafBundle3D* adoptedBundle = NIL );
In addition, each graphic adopted into a group can have its own attribute bundle. The attribute bundle of the graphic overrides the attribute bundle for the group into which the graphic is adopted.
Refer to Chapter 17 for information on scene bundles for setting the scene attributes of lighting, cameras, and atmosphere for rendering 3D graphics including 3D graphic groups.