IRC log for #brlcad on 20140606

00:04.44brlcadandrei__: I didn't just say "investigate dbl_epsilon" ...
00:04.47brlcadandrei__: I said "look for other uses of NEAR_ZERO and IF you cannot find any, use dbl_epsilon"
00:05.18andrei__I know, but I don't understand what to use NEAR_ZERO for?
00:05.36andrei__I assume NEAR_ZERO is a macro that checks if a value is very close to zero
00:07.24brlcadstarseeker: fft is actually a good example of a succinct set of routines that stand on their own ...
00:07.29brlcadI also don't think it's a good idea to end up with monolithic libraries
00:08.35brlcadif something is organized enough that it could very well live on it's own, especially dependency-wise (it does not depend on libbu or libbn structures) we should let it ... it's a move towards library modularity
00:11.54andrei__I was looking in librt/primitives/ell/ell.c  on how NEAR_ZERO it's used, but I would need to subtract and then compare to zero with that. I'm probably missing the point, but this way doesn't make any sense to me
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00:32.42raj12lnmhi brlcad !
00:33.07raj12lnmdo you think that email which I sent on the group. Is that a bug ?
00:33.52raj12lnmAlso, When I change that on my local machine and run the build. And then try to run the python code. (it works :))
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01:28.18Notify03BRL-CAD:zhaoanqing * 61152 brlcad/branches/nmgreorg/src/libged/nmg_simplify.c: change simplify routines to fit new nmg structure.
01:58.43Notify03BRL-CAD:zhaoanqing * 61153 brlcad/branches/nmgreorg/src/libged/shells.c: change routines about shells to fit new nmg structure.
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02:26.08brlcadhcurtis: you must build before you can link against and use BRL-CAD functions
02:27.40brlcadhcurtis: don't bother with creating a cmakelists.txt file, it's important to build by hand first so you understand how compilation and linking work and what the options mean
02:28.15hcurtisbrlcad: Ok
02:28.39brlcadraj12lnm: ignore mk_constraint for now, that's new API that will likely change
02:29.09brlcadhcurtis: you don't need to install, but you do need to build and know where/how to link against the libs you built
02:30.29hcurtisThe good news is that I started the build quite a while ago. The bad news is that it's still going. It takes hours.
02:30.33brlcadraj12lnm: haven't gotten a chance to look into whether it's a bug yet
02:30.50brlcadit will take a while
03:12.00hcurtisbrlcad: It is still building. To find and use bu.h for my program, I considered using the gcc -I option, but my research seemed to say that it wouldn't be "clean" enough of a technique. A lot of information sources named the use of a cmakelists.txt file as a good alternative.
03:22.08hcurtisTo tell the compiler where to find bu.h for use with my program, should I use the command gcc -I? If not, would any of you be willing to steer me in the right direction?
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03:38.49brlcadhcurtis: i'm not sure I understand what is unclean about using the -I option
03:40.19brlcadyou only need gcc, stick to using the compiler
03:40.28brlcadtell it what to compile and how to compile it
03:47.15Notify03BRL-CAD:brlcad * 61154 brlcad/trunk/TODO: update for release, g_ tools were renamed
03:48.18Notify03BRL-CAD:brlcad * 61155 brlcad/trunk/sh/enumerate.sh: remove authorship
04:01.47hcurtisbrlcad: Ok
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07:00.06alisha#freecad
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09:15.18pandrei!seen brlcad
09:15.57pandreimeh, can't remember infobot command
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09:18.39infobotbrlcad <~sean@66-118-151-70.static.sagonet.net> was last seen on IRC in channel #brlcad, 5h 38m 11s ago, saying: 'tell it what to compile and how to compile it'.
09:18.55pandreiah, thanks
09:19.00pandreiit's with ~
09:19.07oana_you're welcome :)
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10:50.11d_rossbergandrei__: to find out where rtip->rti_tol.dist_sq you could try: grep -R "\.dist_sq =" *
10:50.54andrei__in brlcad or rt^3?
10:51.23d_rossbergin src/librt
10:53.50d_rossbergyou'll see it's a product, then what is your next grep search?
10:54.06andrei__src/librt/tol.c
10:54.08andrei__it's here
10:55.06andrei__I am very confused at this point. I don't understand if the tolerance is something hardcoded of a certain value(in Arb8 it's 0.0001) in tol.c it's 0.0005
10:55.24andrei__or if it s something I have to get from the database, something that the database functions set
10:55.36andrei__cause you have that Object parameters that are inherited
10:55.40andrei__like m_internalp
10:56.30d_rossbergit's really hardcoded, and the bad news is the result of "grep -R rt_tol_default *"
10:57.19andrei__then it's much, much simpler than I imagined
10:58.04andrei__rt_tol_default is in the  same file
10:58.06andrei__in tol.c
10:59.04d_rossbergit's the function defined in tol.c, and this file is the only hit for the search, this means ...?
10:59.11Notify03BRL-CAD:tbrowder2 * 61161 (brlcad/branches/d-binding/misc/d-bindings/D.g4.txt =================================================================== and 1377 others): add D grammar in BNF form
10:59.13Notify03BRL-CAD:d_rossberg * 61159 rt^3/trunk/src/coreInterface/FileDatabase.cpp: no db_dirbuild() after db_create()
10:59.59andrei__that the epsilon I should use is
11:00.10andrei__rt_tol_default(my_tol_var)
11:00.23andrei__so that if the hardcoded value changes
11:00.29andrei__my code still fits to it?
11:01.53d_rossbergno, the functionality defined in tol.c is nowhere used ==> you have to look again for the right place in the code
11:02.52andrei__I tend to consider brlcad(collection of sources) and rt^3 two separate entities
11:03.45andrei__in rt^3, there were two places I found anything connected to that tolerance
11:03.48d_rossbergthis is not the question, you want to find out what the value of dist_sq is in sphere.c
11:03.48andrei__the ConstDatabase
11:04.09d_rossbergso you serch with grep for it
11:04.25d_rossbergyou found one promising place in tol.c
11:04.41d_rossbergbut this is dead code, nowhere used in librt
11:04.53d_rossbergso, how to prceed?
11:05.28d_rossbergyou already know that dist_sq = dist * dist
11:05.44d_rossbergtherefore lets look for dist:
11:05.46andrei__so I need to look for dist?
11:05.55andrei__cause there's no other result for dist_sq
11:06.18d_rossberg"grep -R "\.dist =" *" or "grep -R ">dist =" *"
11:06.59d_rossbergmost of the hits are special settings for primitives, one is in tol.c
11:07.18andrei__ok,  1 min, I'll reboot,got an kernel oops
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11:09.23pandreithere, ok, let me see
11:10.22pandreiok, that grep returned a few primitives
11:10.30pandreibut not the one I'm looking for
11:11.45d_rossbergyes, you are looking for the one in prep.c
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11:12.22pandreisorry for asking but, why?
11:12.48pandreiI mean, how could I have figured this on my own
11:14.15pandreinevermind, I'll note it down somewhere and ask you when there's more time
11:14.40d_rossbergat the end you had only two choises: prep.c and wdb.c
11:15.36pandreithere is a nmg/nmg_*
11:16.04d_rossbergyes, but this is only relevant for the nmg primitive
11:17.09d_rossbergand in prep.c you have the rt_new_rti() function which gives you exactly the stucture you handle with in rt_sph_prep()
11:17.42pandreiwell, thanks. I doubt I would've figured without you
11:18.02d_rossberg:) it's called lerning
11:18.13d_rossbergthe solution for your code is simple: 0.0005 * 0.0005
11:18.22pandreiyes, I was updating the patch
11:18.25pandreijust now
11:18.29d_rossbergthe way to get the solution isn't
11:19.25pandreiwell, now I know not to look necessarily for a direct connection when searching for an answer
11:19.39pandreimaybe that'll help at some point
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11:30.02Notify03BRL-CAD:zhaoanqing * 61162 (brlcad/branches/nmgreorg/include/raytrace.h brlcad/branches/nmgreorg/src/librt/primitives/nmg/nmg_mk.c): reorder the routines in nmg_mk.c to fit declaration.
11:30.04Notify03BRL-CAD:zhaoanqing * 61156 (brlcad/branches/nmgreorg/include/raytrace.h brlcad/branches/nmgreorg/src/libged/bev.c and 8 others): change rest routines in libged to fit new nmg structure.
11:31.39clockread first "change chest routines"
11:31.45clockmaybe does too much gym
11:31.59pandreihahaha
11:32.14Notify03BRL-CAD:tbrowder2 * 61163 (brlcad/branches/d-binding/misc/d-bindings/extract-grammar.pl =================================================================== and 378 others): rename file to relect its purpose; add capability to handle on of two grammars: C or D
11:32.16Notify03BRL-CAD:zhaoanqing * 61157 brlcad/branches/nmgreorg/src/mged/edsol.c: change mged routines to fit new nmg structure.
11:32.18Notify03BRL-CAD:d_rossberg * 61160 rt^3/trunk/include/brlcad/Combination.h: for convenience's sake: a simple test for NULL, public default constructors
11:32.57Zhao_Anqingd_rossberg: hi, daniel. I find some warning C4251, should I try to fix them?
11:33.12Zhao_Anqingin librt
11:33.35clockI was wondering about writing an article about modeling in BRL-CAD
11:38.40d_rossbergZhao_Anqing: it looks like it's a cmake thing which is changing frequently
11:39.12Notify03BRL-CAD:tbrowder2 * 61164 brlcad/branches/d-binding/misc/d-bindings/convert-grammar.pl: update the comment
11:39.14d_rossbergsomething with dll-interface
11:42.25Zhao_AnqingYes, It appears when dll-export class using stl classes, e.g. list<>, queue<>.. I search the solution from the webpage which suggest just disable the warning C4251.
11:45.39d_rossbergyou should ignore this warning
11:46.04Zhao_AnqingOk. I see.
11:48.21d_rossbergstl via dll can rally be a problem, but with a c-runtime dll and sam version of the stl on both sides as in BRL-CAD it should be ok
11:51.20Zhao_AnqingFine.
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11:53.37Zhao_Anqingd_rossberg: Then, I hope to consult you about how to change the function nmg_merge_regions(nmgregion*, nmgregion*, const struct bn_tol *)
11:54.03Zhao_Anqingnow, there is no nmgregion struct.
11:54.15Zhao_Anqingso should I replace it by struct tree*?
11:55.14Zhao_AnqingIt become nmg_merge_regions(union tree*, union tree*, const struct bn_tol *)?
12:01.01Notify03BRL-CAD:zhaoanqing * 61158 (brlcad/branches/nmgreorg/include/raytrace.h brlcad/branches/nmgreorg/src/librt/primitives/nmg/nmg_fuse.c and 2 others): routine 'nmg_isect_ray_shell's input parameter list needn't second one. it can be replaced by the shell in 'ray data'.
12:11.39d_rossbergas far as i can see nmg_merge_regions() isn't an nmg-shell function, it's simply the union of two combinations
12:13.03d_rossbergif you need it as a function it would be something for the comb/
12:13.21d_rossbergwith tho rt_comb_internal as parameters
12:15.42d_rossbergi.e. rt_comb_merge(r1, r2)
12:18.09Zhao_AnqingOK. So is it true that I can use the method you taught me yesterday to deal with this function?
12:18.57Zhao_Anqingand where should this function located at? still in nmg_mod.c or any other place?
12:20.12d_rossbergthe place would be src/librt/comb because it operates on combinations
12:22.02d_rossbergand yes, the function would have to be similar to _ged_combadd2(), but with adding a whole boolean tree
12:25.13Zhao_AnqingOK. Thank you. Now I understand and will try it.
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14:57.33Notify03BRL-CAD:tbrowder2 * 61165 brlcad/branches/d-binding/misc/d-bindings/convert-grammar.pl: continue making mods to handle C or D grammar
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14:58.22Notify03BRL-CAD:tbrowder2 * 61166 (svn:ignore ## -3,6 +3,8 ## and 18 others): update ignored filesProperty Changed:----------------brlcad/branches/d-binding/misc/d-bindings/
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15:08.14infobotbrlcad is currently on #brlcad (4h 36m 8s) #bzflag (4h 36m 8s) #stepcode (4h 36m 8s) #gsoc (4h 36m 8s), last said: 'tell it what to compile and how to compile it'.
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15:50.36Notify03BRL-CAD:starseeker * 61167 (brlcad/branches/openscenegraph/BUGS brlcad/branches/openscenegraph/CHANGES and 1067 others): Update openscenegraph with trunk changes through r61164
16:22.41Zhao_Anqinghi, I want to ask the description of a routine should be writen in *.h file, not at *.c. Am I right?
16:44.50clockThI would guess so, in h is where the using programmer looks
16:53.09Zhao_Anqingclock: thank you. I ask this because I find most descriptin about nmg part is at *.c, not *.h.
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17:14.32``Erikinterface should be in the .h file, implementation documentation can live in the .c files where it makes sense... (and nmg is not exactly a golden example. Check out libbu for a better "how to do it" for those kinds of questions)
17:19.21clockZhao_Anqing, to be 100% sure, write two mutually contradictory descriptions, place one into *.c and another into *.h :)
17:20.36``Erik/* that jackass in nmg.h doesn't know what he's talking about, the REAL deal is ... */ O:-)
17:21.25Zhao_Anqing@@
17:22.39Zhao_AnqingOK. So should I take some time to move the comments about nmg from .c to .h?
17:23.25Zhao_Anqingclock: I don't understand, you mean write two mutually contradictory description...should be avoid?
17:23.38``Erikif the comments are about the exposed interface, yes... the .h is where you go to see how to use it, the .c is where you go to see how it works inside
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17:25.46Zhao_AnqingYes, that's my point.
17:26.40clockZhao_Anqing, I meant it as a joke... of course contradition in descriptions is wrong
17:29.35Zhao_AnqingAha~, I guess that's a joke, but not quite sure. I am not good at English enough. you know that's not my mother tongue. however, thanks for your help. :)
17:30.06Zhao_AnqingI understand this question completely now. :)
17:34.33``Eriksorry if my 'jackass' joke contributed to the confusion.. libbu would be the example to look at if you need to see 'the right way', a lot of attention was paid to making it 'right' as far as style, documentation, convention, etc
18:45.32Notify03BRL-CAD Wiki:14.98.156.234 * 7216 /wiki/User:Shainasabarwal/GSoC14/logs: /* Week 3 */
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19:52.30Notify03BRL-CAD Wiki:Popescu.andrei1991 * 7219 /wiki/User:Popescu.andrei1991/devlogs2014: /* Week 3 */
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20:12.46pandreianyone else familiar with the coreinterface? Except Daniel?
20:21.51Notify03BRL-CAD:starseeker * 61168 (brlcad/trunk/doc/docbook/system/mann/en/search.xml brlcad/trunk/src/librt/db_diff.c and 3 others): Add a -param option to search (needs more testing.) This will allow searching based on internal parameters of an object (as opposed to general attributes) provided those internal attributes have a tcl list representation. It has so far successfully used 'mode' as a filter for listing
20:21.53Notifyvolume and plate BoT primitives, and a couple other parameters. Probably will need to add a table listing the valid parameters available for the various primitives to the search man page, since it's not immediately obvious what the possibilities are.
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20:43.44Notify03BRL-CAD:starseeker * 61169 brlcad/trunk/src/librt/search.c: Refactor part of the avs checking code common to both param and attr functions.
21:00.18Notify03BRL-CAD Wiki:49.205.107.80 * 7220 /wiki/User:Krajkreddy/GSOC14/summary: /* Week3 */
21:37.00Notify03BRL-CAD:carlmoore * 61170 (brlcad/trunk/doc/docbook/system/man1/en/hex.xml brlcad/trunk/doc/docbook/system/man1/en/imgdims.xml): use different style for command name at start of sentence
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