IRC log for #brlcad on 20160222

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14:17.58 ``Erik Stragus: happy bday!
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15:16.20 tandoorichick_ would it be useful to have a macro in vmath.h for the area of a triangle (say ABC) that can be computed as half the magnitude of the cross product of AB and AC?
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16:16.13 brlcad tandoorichick_: not for vmath, but elsewhere in libbn sure ... though I think that logic exists somewhere already
16:26.03 Notify 03BRL-CAD:d_rossberg * 67094 brlcad/trunk/include/bu/defines.h: regarding rev. 66674: added empty fallback definitions in case of the compiler test variables aren't set
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16:54.25 Notify 03BRL-CAD:brlcad * 67095 brlcad/trunk/src/librt/bundle.c: make rt_shootrays() fire rays in parallel automatically. this is implemented using the new bu_parallel feature that runs as many threads of execution as can usefully be run, up to the number of available cores, but respecting other bu_parallel threads so the machine is never oversubscribed. it means it'll run as fast as it can cooperatively. currently
16:54.27 Notify individual ray dispatching is done one at a time per thread with simple semaphore bookkeeping though we'll eventually want to dispatch bundles coherently for even greater performance.
16:54.29 Notify ...
17:06.17 tandoorichick_ brlcad: could you tell me where i could find that? i saw that the surface area function for an 'ars' doesn't exit and so decided to work on that.
17:08.31 tandoorichick_ would it be right to divide the area between two successive waterlines into triangles and find their area? (i had a confusion because in the case of the 1/8th turn twist shown in the wiki the triangles can be seen only in the raytraced figure..
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19:01.49 brlcad tandoorichick: could be in lots of places, but probably libbn
19:02.09 brlcad src/librt/primitives/bot and nmg are both polygonal structures too that might have it
19:02.13 brlcad s/it/something/
19:02.45 tandoorichick okay cool, thanks. what about the surface area for ars?
19:05.49 Notify 03BRL-CAD:brlcad * 67096 brlcad/trunk/doc/STRATEGY: update some notes about marketability, doing a rough sorting. replaced generic need fullfilment with analysis prep.
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19:40.21 Notify 03BRL-CAD:starseeker * 67097 brlcad/trunk/src/libbu/tests/CMakeLists.txt: Add stub code for hash testing.
19:51.36 starseeker brlcad: I'm not having any luck reproducing that rtshot error - there were a couple commits that delt with a similar issue, iirc: r65636 and r66759
19:54.06 starseeker tandoorichick: libbg is the other area to look for geometry specific algorithms, although generally those are more complex...
19:59.09 tandoorichick okay thanks. :)
19:59.34 tandoorichick any input for the surface area computation i mentioned above?
20:09.28 Notify 03BRL-CAD:brlcad * 67098 brlcad/trunk/doc/STRATEGY: updated notes on the strategic activity to condense and refactor brl-cad, using 'Concentration' as the name for fthis initiative and strategic goal. seems quite appropriate.
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20:39.07 brlcad starseeker: okay, I'll make sure it's not a stale build and see if I can get a more specific backtrace then
20:40.45 brlcad thanks
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21:23.48 Notify 03BRL-CAD:n_reed * 67100 brlcad/trunk/include/bu/cmd.h: rename header guard symbol per established convention
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21:35.17 Notify 03BRL-CAD:brlcad * 67099 brlcad/trunk/doc/STRATEGY: integrate first half of notes, clarifying the taxonomy and structue being used here. group all projects toegether.
21:38.07 Notify 03BRL-CAD:brlcad * 67101 brlcad/trunk/doc/STRATEGY: integrate remainder of notes, expanding on gcv, website, and performance projects. refine the new website task to be a little more specific, focusing on the promulgation of content that is not there now (webulgation) with other objects for making the experience better, more useful.
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23:50.32 Notify 03BRL-CAD:starseeker * 67102 brlcad/trunk/src/libbu/tests/hash.c: Start some experiments with hash. If I'm not mistaken, bu_hash is not designed to work with anything other than string keys?
23:53.43 starseeker rubs eyes... this is turning out to be a tad deeper than I thought...
23:55.39 starseeker interesting though

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