Hi folks, I'm trying to use the isosurface tools (export_sketchfab & export_obj; http://yt-project.org/doc/visualizing/sketchfab.html) to make renderings of multiple line species from ALMA data cubes. I'm doing this using both the yt-fits interface and spectral-cube (spectral-cube.rtfd.org). I've had some success in getting multicolored and transparent contours to show up (e.g., https://sketchfab.com/models/8cddb94df8024c28ab3e4e5a43c2b069), but I still don't have complete control over the colors. To make that model, I created pure red/green/blue colormaps and added them to the colormap registry, e.g.: blue = mpl.colors.LinearSegmentedColormap('blue', {'red':[(0,0,0),(1,1,1)], 'green':[(0,0,0),(1,1,1)], 'blue':[(0,1,1),(1,1,1)]}) from yt.visualization._colormap_data import color_map_luts color_map_luts['blue'] = blue(np.linspace(0,1,256)).T but that was fairly awkward, and the contours are still showing up white-ish. I think this is because I have set the color_field to the flux_field (I only have one field to work with!): surf = dataset.surface(dataset.all_data(), dataset.field_list[0], level) surf.export_obj(filename, transparency=transparency, color_field=dataset.field_list[0], color_map='blue', plot_index=jj) but I can't figure out an alternative way to specify color, except perhaps to define a dummy field that is all 1 - which I also don't know how to do, but I'm sure I could figure it out. Is there a better way, though? Also, when I try importing my meshes into MeshLab, I get the error: Error details: Some materials definitions were not found, a default white material is used where no material was available and then the contours all show up as gray and opaque, even if I change "render->color" to "per face" as suggested in the docs. But, I've never used MeshLab before, so I might just be misusing the program. Thanks, -- Adam Ginsburg Fellow, European Southern Observatory http://www.adamgginsburg.com/