Vikram Atreya (Dec 04 2020 at 19:35): Vikram Atreya (Dec 04 2020 at 19:35):As I did not understand how to proceed in the above problem, I tried another task from the Deuces page, 2.1.5, https://brlcad.org/wiki/Deuces#Debug_and_fix_a_bug_converting_cylinders
When I ran this dbupgrade -r cylinder.g it gave Usage: bin/dbupgrade [-f] input.g output.g
If I run it with bin/dbupgrade -r cylinder.g output.g it gave _GLOBAL not supported in version 4 databases, not converted
0 objects failed to convert
How do I reproduce the bug mentioned in the task?
Vikram Atreya (Dec 06 2020 at 06:11):Could someone help me in reproducing this bug?
Sean (Dec 06 2020 at 06:13):Did you run the "l" command in mged before and after?
Vikram Atreya (Dec 06 2020 at 06:19):Yes i did, but the dbupgarde itself failed. So I dont think I reproduced the bug correctly
Sean (Dec 06 2020 at 06:19):where's the dbupgrade failure message?
Sean (Dec 06 2020 at 06:19):what you pasted doesn't show one
Vikram Atreya (Dec 06 2020 at 06:21):Wait let me run it once again and tell you what output I got exactly
Vikram Atreya (Dec 06 2020 at 06:23):First I entered "dbupgrade -r cylinder.g " as was given in the task
Vikram Atreya (Dec 06 2020 at 06:23):Usage: bin/dbupgrade [-f] input.g output.g
This was the output
Vikram Atreya (Dec 06 2020 at 06:24):Then i entered : "bin/dbupgrade -r cylinder.g output10.g"
Vikram Atreya (Dec 06 2020 at 06:25):This was the output: "_GLOBAL not supported in version 4 databases, not converted, 0 objects failed to convert"
Sean (Dec 06 2020 at 06:31):yes... that all expected
the first time, the usage was wrong.
the second time, it worked .... "0 objects failed to convert"
Sean (Dec 06 2020 at 06:32):the message about _GLOBAL is just informative as the -r flag is downgrading the database to a previous format that does not support _GLOBAL
Vikram Atreya (Dec 06 2020 at 06:33):Sean said:
the second time, it worked .... "0 objects failed to convert"
OMG sorry, I did not read it correctly. I did not focus on the 0 :P
Vikram Atreya (Dec 06 2020 at 06:35):reproduced the bug, Thanks
Vikram Atreya (Dec 13 2020 at 07:16):So in this, What does dbupgrade do?
Sean (Dec 13 2020 at 07:27):typically it upgrades BRL-CAD format geometry data files from v4 format to v5 format. With the -r flag, it does the reverse and downgrades a v5 format file into v4 format.
Vikram Atreya (Dec 13 2020 at 07:28):Ohk
Vikram Atreya (Dec 15 2020 at 05:41):WHen I do l rhc what code is going to run?
starseeker (Dec 15 2020 at 15:05):you can follow it from src/mged/setup.c - the mged_cmdtab translates the string into the first function to call
Vikram Atreya (Dec 15 2020 at 16:45):Ohh cool
Sean (Dec 15 2020 at 22:17):specifically, the 'l' command translates into ged_list() which is in src/libged/list/list.c
Sean (Dec 15 2020 at 22:19):just in case you had trouble following the logic there. setup.c registers a function callback, so when user types "l" it'll call that function.
Vikram Atreya (Dec 16 2020 at 17:42):Could someone help me with using a debugger for src code, like I know how to use it for small programs which are in 1 file.
Maybe you could send a link which explains this
Vikram Atreya (Dec 30 2020 at 07:33):I want to log a variable for debugging, How do i do that? (bu_log works only for strings afaik)
Vikram Atreya (Dec 31 2020 at 11:36):Ignore the above msg.
I think I have solved this bug, there was a small mistake with the management of rhc_c variable. The l rhc command works fine now, Should i test this in any other way?
Vikram Atreya (Jan 11 2021 at 07:15):Could anyone tell me how I could test the fix I've made or if l rhc has passed its sufficient?
Sean (Feb 02 2021 at 19:54):@Vikram Atreya did you figure out that bu_log() is the same as printf()?
Sean (Feb 02 2021 at 19:57):If the "l" output is identical, that's a pretty good indication that you fixed the issue. The only testing required would be a try a couple different rhc parameters to make sure the before/after looks the same.
Vikram Atreya (Feb 03 2021 at 03:35):Sean said:
Vikram Atreya did you figure out that bu_log() is the same as printf()?
Yeah I did :)
Vikram Atreya (Feb 03 2021 at 03:35):Sean said:
If the "l" output is identical, that's a pretty good indication that you fixed the issue. The only testing required would be a try a couple different rhc parameters to make sure the before/after looks the same.
Will do
Sean (Feb 03 2021 at 03:39):@Vikram Atreya let me know when you have a patch to review and I'll take a look at it.
Vikram Atreya (Feb 03 2021 at 03:40):Cool
Vikram Atreya (Feb 03 2021 at 05:04):I created a ticket for the patch , #562
Sean (Feb 03 2021 at 05:44):Wow, seriously good find @Vikram Atreya... That was a pretty obscure well-hidden bug!
Sean (Feb 03 2021 at 05:45):Your fix looks right to me. The old import4/export4 code is what serializes data to/from disk. It was writing it out in one position, but then reading it back from a different (wrong) position from the serialized bytes.
Sean (Feb 03 2021 at 05:46):You'll be credited with this fix in our next public release. Well done, again!
Vikram Atreya (Feb 03 2021 at 06:47):Sean said:
You'll be credited with this fix in our next public release. Well done, again!
Thank you :grinning_face_with_smiling_eyes:
Vikram Atreya (Feb 03 2021 at 06:59):U gave me 2 bugs which I could try solving back in Nov I think, I gave up on the first one :P as i dint have a lot of time back then. Also i would like to apply for GSoC this year. So based on that could you give me something to work upon?
Sean (Feb 03 2021 at 06:59):certainly. what kind of coding interests you?
Vikram Atreya (Feb 03 2021 at 07:00):Umm what do you mean by kind? like debugging, new code etc?
Sean (Feb 03 2021 at 07:02):there are all different kinds of coding, like low-level logic, or networking, or high performance optimization, or multithreading, or graphics, or interesting algorithms, or high level GUI work, or ....
Sean (Feb 03 2021 at 07:03):if you're unsure, that's an answer too and we can find something relatively self-contained.
Sean (Feb 03 2021 at 07:03):did you have ideas on what you intended to propose for gsoc?
Sean (Feb 03 2021 at 07:03):do you have strong feelings on C vs C++ vs Python vs ...
Vikram Atreya (Feb 03 2021 at 07:03):I like interesting algorithms for sure, dont have any idea regarding high level GUI and multithreading
Vikram Atreya (Feb 03 2021 at 07:04):Sean said:
do you have strong feelings on C vs C++ vs Python vs ...
Nothing like that, I am fine with all 3 languages
Vikram Atreya (Feb 03 2021 at 07:04):Sean said:
did you have ideas on what you intended to propose for gsoc?
Not yet
Sean (Feb 03 2021 at 07:04):any particular technology like opengl, opencl, pthreading, intel tbb,
...
Vikram Atreya (Feb 03 2021 at 07:05):Sean said:
any particular technology like opengl, opencl, pthreading, intel tbb,
...
I dont know any of them now, but im learning openGL as part of a course in college this semester.
Sean (Feb 03 2021 at 07:05):Vikram Atreya said:
I like interesting algorithms for sure, dont have any idea regarding high level GUI and multithreading
That's good to know -- I suggest leaning on your strengths and what you know for starters.
Sean (Feb 03 2021 at 07:06):BRL-CAD can be complex and intimidating enough as it is to learn what is what and where things are to add new unknown technologies into the mix also (at least for GSoC -- on your own, do whatever you love).
Sean (Feb 03 2021 at 07:08):@Vikram Atreya I suggest starting by reading over our previous GSoC years and see if any of those projects sound really interesting to you. they're all on the wiki at https://brlcad.org/wiki/Google_Summer_of_Code/YEAR where YEAR is 2019, 2018, 2017, etc.
Vikram Atreya (Feb 03 2021 at 07:09):Sean said:
Vikram Atreya I suggest starting by reading over our previous GSoC years and see if any of those projects sound really interesting to you. they're all on the wiki at https://brlcad.org/wiki/Google_Summer_of_Code/YEAR where YEAR is 2019, 2018, 2017, etc.
Sure, I will get back if i find something interesting
Sean (Feb 03 2021 at 07:10):picking up where someone else left off, or redoing their work if it wasn't successful, is always of interest in order to not start anew
Vikram Atreya (Feb 04 2021 at 07:16):https://brlcad.org/wiki/
is not opening
Vikram Atreya (Feb 04 2021 at 09:33):Now its working
Last updated: Jan 09 2025 at 00:46 UTC