New issue 1112: [experimental] document how to use the `get_` and `set_` functions in the VR objects https://bitbucket.org/yt_analysis/yt/issues/1112/experimental-document-how-t... Cameron Hummels: Add narrative docs demonstrating how to get the source, camera, get transfer function, etc. so one can change them. `get_` and `set_` functions in the source are opaque.