[JAVA3D] Problem with grouping several objects

[Steve Grenier]

Hi All,   I'm wondering if anyone out there has some insight on this.  I created a class which defines several different custom Shape3D objects.  All of these objects in the class are add to a single 'Group' object, and the getShape() of this class returns the Group object.  This is so that I can add the single large group of objects as "one" Shape to the scene graph and transformations on that group will affect the entire object.   My problem is that for some reason, when I create one of these objects and add it to my scene,  some of the "individual" Shape3D objects from the original class seem to "overlap" each other.  The group as a whole still transforms as one object, but the individual pieces that make up the group this problem.  For example,  a large cube-like object seems to cover a plane-like object, even though the plane is closer to the viewer (z-buffer).  Does anyone know why this might happen?  Any help would be appreciated.   Steve Grenier