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addons/vrpn/docs/Notes.md

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+# Resources
+
+Reference for implementing this library are from here [vrpn-rs description of VRPN protocol](https://github.com/vrpn/vrpn-rs/blob/main/Protocol.md)
+Unfortunately, there are some mistakes in the document, most notably it presumes that
+Quaternion in VRPN (quat library) are w,x,y,z - which is incorrect.
+
+# Design
+
+Allow for a session based design - data needs to be collected per block 
+and immediatly made available. Minimal or no internal state keeping!
+
+- first collect names and ids of message_types and senders (stored in session)
+- register listeners in session
+- listeners inject captured data with signals
+
+- keep naming "classic" ??? ... above session is a tracker with a sender with sensors
+
+# Todo
+- [x] Testset for Quaternion rotations
+- [x] Axis as subscene 
+
+# Internal Notes
+
+- Graphics Interaction Lab OptiTrack system is at 212.201.64.122