Dear all: I just wonder when I pick several objects say one sphere and one square, how do I group together. There two objects could be created anytime in any order. I have a vector of object, could i use reference of that. The other thing is when I try to delete a object from the canvas, it seems to work by using the Branchgraph.detach() function. But once I detach all the object, I can add any more object to the canvas, even though the counter for the vector still increments. Thanks a lot! Kelan ===================================================================== To subscribe/unsubscribe, send mail to [EMAIL PROTECTED] Java 3D Home Page: http://java.sun.com/products/java-media/3D/