New issue 1249: annotate_cell_edges: wrong/ugly output for high-resolution data https://bitbucket.org/yt_analysis/yt/issues/1249/annotate_cell_edges-wrong-u... Dominik Derigs: This concerns the functionality added in issue #1198 (annotate_cell_edges). As can be seen in the picture, the routine produces wrong outputs for sufficiently refined data sets:  MWE to generate this image: ``` #!python import yt ds = yt.load("windtunnel_4lev_hdf5_plt_cnt_0040") slc = yt.SlicePlot(ds, 'z', 'density') slc.annotate_cell_edges(alpha=0.3,color=(0.0,0.0,0.0)) slc.save() ``` Data taken from: http://yt-project.org/data/WindTunnel.tar.gz If I change the resolution of the generated fixed resolution buffer in yt/visualization/plot_window.py: ``` #!python class PlotWindow(ImagePlotContainer): [...] def __init__(self, data_source, bounds, buff_size=(800,800), antialias=True, periodic=True, origin='center-window', oblique=False, window_size=8.0, fields=None, fontsize=18, aspect=None, setup=False): ``` from 800 to a higher value the result changes, but still it is not satisfactory. For very high resolutions, the results become worse again. 800x800:  1200x1200:  1600x1600:  3200x3200:  6000x6000: