Thank you for your reply Robert!
    I will try what you suggested to me about the displaying of the nodes.
    And about the callbacks, well, yes i am using a huge amount of callbacks... 
As a matter of fact, i would like to create a software like Celestia and the 
nodes in the octree are groups of stars. And what i would like to do, is to 
hide a group of stars when that group is far away from the viewer. So with 
about 80000 stars in the scene, i assigned about 200 callbacks for each node of 
the tree...

Bye

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