Hi, Thanks a lot for adding the Segmentations mode in v1.8, this is very much welcomed for cryo-ET data! Are there any plans for expanding the capabilities of this tool? If possible, I would like to suggest some features for manual segmentation: * Segment contiguous density in 3D by clicking on it (akin to the blob selector in the "Right Mouse" options, which operates on surfaces) * Related: threshold-based segmentation i.e. segment in 3D all contiguous density between selected minimum and maximum density thresholds * 2D/3D Lasso-based segmentation * Dilation, erosion and smoothening of segmentations Some of these things are already possible by combining volume and surface operations or with external tools, but it would be very nice to have everything streamlined in one click (or a few) through the GUI. Alternatively, I would appreciate pointers on how to implement these features as a ChimeraX plugin. Happy to discuss more. Thank you and have a nice weekend! -- Ricardo Diogo Righetto