New issue 1099: [experimental] defaults for generating a simple VR https://bitbucket.org/yt_analysis/yt/issues/1099/experimental-defaults-for-g... Cameron Hummels: There should be a default filename for saving images. Default filename should be something descriptive, like ProjectionPlot or SlicePlot filenames default to. In general kwargs with good defaults would be better for a variety of VR functions instead of requiring args.