New issue 925: Add an IsocontourPlot https://bitbucket.org/yt_analysis/yt/issue/925/add-an-isocontourplot Chris Malone: Most visualization software provides the capability to make isocontour plots, even in 3d. We have a round-about way of doing this in a [cookbook recipe](http://yt-project.org/docs/3.0/cookbook/complex_plots.html#plotting-isoconto...), but this should be much simpler for the user. Responsible: ChrisMalone