[yt-users] projection of max level along line of sight?

Hi folks, I'm trying to make a projection of an Enzo dataset using yt-3, showing the maximum level along the line of sight. This command: ProjectionPlot(pf,"x","grid_level",weight_field=None,data_source=reg,width=(0.25,'unitary')).save() definitely seems to make projections of grid levels, but I'm not convinced that it is the maximum level along the LOS. Is there a better way to do this? Thanks! --Brian