IRC log for #brlcad on 20170404

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00:29.05 *** topic/#brlcad is GSoC students: if you have a question, ask and wait for an answer ... responses may take minutes or hours. Ask and WAIT. ;)
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06:14.05 brlcad gets 1/3rd through the command list
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08:54.26 elpea I used clone to generate a spiral screw structure from thin rpp's which I grouped together. I can convert this to stl just fine using 0.001 absolute tessellation but when I add a cylindrical solid axis in the middle and create a region by doing union on the group and the axis, g-stl.exe exits with "Dangling faces detected in rA after boolean" ... I tried to google this error without getting much wiser. any advice?
08:56.17 elpea there are 1440 said thin rpp solids total, plus the axis rcc
08:58.18 elpea I tried to elongate the axis so that its dimensions went beyond the spiral structure in both ends on Z axis, but this didn't help
09:00.46 elpea the rpp's dimensions are 50 0.5 0.5, and the spiral structure is made with 720 clones with 0.5 rotation and 0.1 elevation (Z) increments
09:02.20 elpea with no translation on other axes besides Z (so everything stacks at 0 0 0, and of course there is a lot of overlap between the solids)
09:04.04 elpea the axis has a radius of 5 and resides in the middle (0 0 0)
09:06.43 elpea on another topic: is there a way to select the parameters to edit directly from CLI? I find it a bit tedious to pick e.g. an edge to edit using the GUI... I know you can do this with keyboard, but it's still clunky.
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09:20.00 elpea another feature request(?): it would be nice if the CLI colorscheme was configurable, or at least invertable. I often work at night so I really need a dark background.
09:22.33 elpea since I already started bombarding with questions; how is the multicore support in BRL-CAD/MGED? I'm looking to upgrade my rig at some point and have been considering Xeons to replace my i7.
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09:57.23 elpea ok... "solved". for reasons unknown to me, the conversion succeeds if I group the rpp's comprising the spiral structure with the axis, instead of regioning the spiral and the axis together separately.
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10:01.22 elpea however... I need to subtract an rcc from the axis to create a hole in it, so I still have the same problem.
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11:56.41 elpea I eventually got around the error by grouping the spiral parts with the axis' body cylinder, creating a combination where I subtracted the axis hole cylinder from that group, and converting the combination to stl.
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12:34.35 brlcad elpea: tessellation failures resulting in dangling faces are highly sensitive to alignment issues
12:35.23 brlcad elpea: try rotating the innerrcc a few degrees or expanding/contracting the diameter ever so slightly (e.g., 0.01 difference)
12:36.54 brlcad other things to try if those fail is different tighter tolerance or tessellating in steps (spiral first to a bot, then do the axis to a bot, then bot to bot)
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