Re: [JAVA3D] basic picking

[Richard Bone]

You can use getUserData() and setUserData(Object o).  It can contain any object so a String containing the name can be used. Here is a piece of code I use that gets the names and positions of BranchGroups and TransformGroups.  The first piece of code gets all the Groups (pass it the scenegraph and 0 as initial values).  The second piece of code produces the Strings:               /**              * This method traverses the tree and returns the positions.              *              * @return The String representation of the tree.              */           public String traversePositions(Group tfg, int level)         {                 Transform3D tempTrans = new Transform3D();                 Vector3f vecTemp = new Vector3f();                 Enumeration enum;                 String output = "";                 int localLevel = level;                   try                 {                         enum = tfg.getAllChildren();                         level++;                           while(enum.hasMoreElements())                         {                                     try                                     {                                                 Group tfg1 = (Group)enum.nextElement();                                                 output += traversePositions(tfg1, level);                                                 try                                                 {                                                             TransformGroup tfg2 = (TransformGroup)tfg;                                                             tfgCount++;                                                             ((TransformGroup)tfg).getTransform(tempTrans);                                                             tempTrans.get(vecTemp);                                                 }                                                   catch (Exception e)// TransformGroupCastException                                                 {                                                             brgCount++;                                                 }                                       }                                       catch (Exception e)// GroupCastException                                     {                                                 othCount++;                                     }                           }//end while loop               }               catch(Exception e)// All other exceptions             {}               output += createPosInfo(tfg, localLevel);               return output;         }               /**              * This method creates a String containing the name and position of              * a transform group.              *              * @param tg The transform group.              * @param name The name of the transfrom group.              * @param level The level of the transform group (root = 0).              * @return The String representation.              */               public String createPosInfo(Group tg, int level)             {             Transform3D tempTrans = new Transform3D();             Vector3f tempVec = new Vector3f();             Vector3f tempVec2 = new Vector3f();             String tabs = "";             for (int i = 0; i < level; i++)                         tabs += "\t";             if ((String)tg.getUserData() != null)             {                         try                         {                                     tg.getLocalToVworld(tempTrans);                                     tempTrans.get(tempVec2);                                     ((TransformGroup)tg).getTransform(tempTrans);                                     tempTrans.get(tempVec);                                     tempVec2.add(tempVec);                                     tabs += " " + (String)tg.getUserData() + tempVec2.toString() + "\n";                         }                           catch (Exception e)                         {                                     tabs += " " + (String)tg.getUserData() + "\n";                         }                 }                   return tabs;             }   Hope this helps. Rich Bone Birmingham University =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".