vrFieldAccess.vrFieldAccess:
The vrFieldAccess class offers access to any kind of data (fields)
inside the scenegraph (regardless if it is a node, a geometry,
material etc.).
vrOpenVR.vrOpenVRFrameTimings:
The vrOpenVRFrameTimings class stores timing information from the
OpenVR library that can be queried by calling
getOpenVRFrameTimings().