[JAVA3D] modelclip problem

[Olivier Tassy]

Hello, I have several transparent objects with their names inside (some OrientedShape3D). I use a ModelClip with 6 planes to slice objects but not their name ( I used the ModelClip.addScope(objects) method ). I want each name disappear only when it's object has completely disappear.  so I used a BoundingPolytope, dynamically defined with the modelclip plane equations, and the BoundingPolytope.intersect() method ( or a collision detection behavior ) to detect if an object is entirely clipped (in other hands, if my object's bounds don't intersect with the BoundingPolytop). I don't know if I used the rigth method but I've got a strange problem: once the first detection occurs, names are clipped by the modelclip (just like other objects).       here is a sample code (with the BoundingPolytope.intersect method). This method is called each time one of the 6 modelclip planes moves.   //I don't know why but here, I can't use the  modelclip.getPlanes() method (it returns null).                //this part dynamically defines the BoundingPolytop         Vector4d[] Allplanes = new Vector4d[6];         Vector4d plane = new Vector4d();         modelclip.getPlane(1,plane);             Allplanes[1]=plane;             plane = new Vector4d();         modelclip.getPlane(2,plane);             Allplanes[2]=plane;             plane = new Vector4d();         modelclip.getPlane(3,plane);             Allplanes[3]=plane;             plane = new Vector4d();         modelclip.getPlane(4,plane);             Allplanes[4]=plane;             plane = new Vector4d();         modelclip.getPlane(5,plane);             Allplanes[5]=plane;             plane = new Vector4d();         modelclip.getPlane(0,plane);             Allplanes[0]=plane;             plane = new Vector4d();                polytope.setPlanes(planes);                           //this part check if there is a collision between bounds.             Set keys = handler3d.objs.keySet();             Iterator ite = keys.iterator();             while (ite.hasNext()){                                 Object obj3d = ite.next();                 Shape3D node = (Shape3D) objs.get(obj3d);  //objs is a hashtable with the objects                 String nameLabel = node.getUserData().toString();                 Shape3D name = (Shape3D) labels.get(nameLabel);  //labels is a hashtable with the name of the objects                                  if ( ! polytope.intersect(node.getBounds()) )                     name.getAppearance().setTransparencyAttributes(new TransparencyAttributes(TransparencyAttributes.NICEST ,0.0f));                 else                     name.getAppearance().setTransparencyAttributes(new TransparencyAttributes(TransparencyAttributes.NICEST ,1.0f));                              }            Do you understand what's happening? Thanks for your help in advance.   Olivier.