I followed loosely the example provided here http://yt-project.org/docs/dev/examining/low_level_inspection.html#examining... but encountered an error message using a smoothed covering grid with SPH data instead of a covering grid. I posted an MWE here: http://pastebin.com/2sStpLmw which leads to the error message "AttributeError: 'YTSmoothedCoveringGrid' object has no attribute '_pdata_source' "
I wanted to use a smoothed covering grid because I found that using SPH data a lot of "holes" are in `covering grid' (but not, e.g., in a slice plot). So I assumed there is some problem in duplicating the values from the coarser grids?
My yt version is 3.2-dev.
Thanks a lot for your time & help, Max