Hi Chris, Too many questions for me to answer on my own.
I think it might be best for you to take a step back and learn a little more about the basic of scene graphs, gain a bit of confidence with how to create and manipulate the scene graph and then once you are a bit more experienced then dive into solve the particular problem you have in front of. The problem is actually quite straight forward, I've given you some pointers, but in the end you need more background knowledge to make sense of it, this thread really isn't the appropriate place to attempt to teach you everything about scene graphs. There are 170 examples in the OpenSceneGraph distribution to learn from. We have several books published that you can purchase. There is docs online. There are over a decade of discussion here on osg-users mailing/forum as a resource as well. While it might all seem pretty daunting, you don't need to learn it all at once. If you want to learn about transforms then doing a search with the OpenSceneGraph/examples for any reference to Transform would be a good place to start. Same applies to Callbacks. One of examples that jumps out at me as one place it might be worth looking at is the osgrobot example - this has a nested hierarchy of transform and geometry. Best of luck, Robert.
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