| 00:01.31 | *** join/#brlcad hcurtis (b82d1964@gateway/web/freenode/ip.184.45.25.100) |
| 00:03.19 | hcurtis | I have been trying to re-write my dynamic allocation code for fast4-g.c so that it will be good enough to turn into a patch. I am rereading my notes and identifying their most important and helpful pieces of information so that I can accomplish this task. |
| 00:34.14 | hcurtis | One thing that is holding me back as I work on this task is that I don't have a fully clear picture of how fast4-g.c converts fastgen4 format to BRL-CAD format. Likewise, I don't see how we determine how large the allocated memory is supposed to grow when it needs to grow. |
| 00:35.38 | hcurtis | I have tried to research this (for example, one helpful resource I found was the BRL-CAD glossary, which explained to me what groups and regions in BRL-CAD are), but I am having a hard time knowing what new code to write to solve fast4-g's problems. |
| 00:36.38 | hcurtis | How do we know how large the allocated memory is supposed to grow to when it does need to grow? |
| 00:42.23 | hcurtis | Well, now that you've heard the bad news, some good news is that I think that the following line of code might be the right foundation for where I need to go: |
| 00:42.57 | hcurtis | static struct wmember *group_head = (struct wmember *) bu_malloc(sizeof(struct wmember), "alloc heap memory for wmembers"); /* Lists of regions for groups */ |
| 01:05.06 | kanzure | so is that mk_metaball function broken? |
| 01:20.49 | Notify | 03BRL-CAD:starseeker * 61351 brlcad/trunk/src/other/CMakeLists.txt: Get rid of hv3 and sqlite - we're not currently using them, and svn has the history if we need it someday. |
| 01:25.07 | Notify | 03BRL-CAD:starseeker * 61352 (brlcad/trunk/misc/tools/CMakeLists.txt brlcad/trunk/src/other/CMakeLists.txt): dom2dox probably fits better in misc/tools |
| 01:33.52 | hcurtis | I understand that to reallocate memory in the corrected fast4-g.c, there needs to be code whose logic is this: |
| 01:36.21 | hcurtis | if (you don't have all of the memory you need for the wmembers) static struct wmember* newMemorySpace = (struct wmember *) bu_realloc (group_head, someNumberWhoseOriginWeDontKnow, “a string”) |
| 01:36.51 | hcurtis | I just have to figure out how to code the if statement and determine what someNumberWhoseOriginWeDontKnow is. How do I do that? |
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| 02:08.49 | hcurtis | Fast4g.c uses bu_malloc to allocate memory for the region name, faces, thickness, facemode, and gridpoints. This means that the program will need to be able to bu_realloc memory for some or all of these. |
| 02:15.47 | hcurtis | All of these elements that I just mentioned are pointers, of course. |
| 02:25.08 | hcurtis | Likewise, fast4g.c uses bu_calloc to allocate memory for the region list, bot_ip.vertices, bot_ip.thickness, and bot_ip.faces. This means that the program will need to be able to bu_realloc memory for some or all of these pointers. |
| 02:48.25 | hcurtis | brlcad: Am I getting warmer? ;) |
| 02:56.44 | hcurtis | I have been fixated on repairing the fast4-g.c element called group_head because that was the stack-allocated item that the last person who attempted this task tried to make dynamic. However, it is possible that to improve fast4-g correctly, I need to convert some other thing to dynamic allocation. What do you (anyone who would like to comment) think? |
| 03:19.10 | hcurtis | Oops. I take back what I wrote about how it might be incorrect to focus on group_head. I re-read Sean's comments in commit 60592, and in them he said that fast4-g should not be manually recreating the wmember list. Apparently, that wmember list is group_head. |
| 03:29.22 | hcurtis | Why does the original group_head array in fast4-g.c hold 11 elements? Why 11 in particular and not some other number? |
| 03:44.50 | hcurtis | Here are two things I need to answer to complete this fast4g task but have not been able to: |
| 03:45.43 | hcurtis | 1. How do we know when we need to resize the heap memory allocated for the group_head? |
| 03:46.21 | hcurtis | 2. Once we've determined that, how do we know what new size it needs to be? |
| 03:51.05 | hcurtis | By the way, the bu_realloc argument called someNumberWhoseOriginWeDontKnow that I referred to earlier is the new size (in bytes) of the heap memory for group_head. |
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| 04:32.05 | bakom | hello |
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| 04:32.46 | bakom | i have some problem, |
| 04:33.42 | bakom | i want to convert g file into vrml format using g-vrml but file is not converting properly |
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| 04:35.15 | gurwinder | hello brlcad |
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| 04:54.21 | hcurtis | I have written a new draft of my code to convert elements of BRL-CAD's fast4-g.c from stack allocated to dynamic. Any feedback is welcome. http://paste.lisp.org/+32AH |
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| 06:21.07 | raj12lnm | kanzure: I think yes. |
| 06:21.25 | raj12lnm | I have added a patch at https://sourceforge.net/p/brlcad/patches/278/ |
| 06:22.13 | raj12lnm | I have explained the same on the mailing list. |
| 06:23.12 | raj12lnm | Waiting for the response. |
| 06:23.15 | raj12lnm | Its been long though. |
| 06:24.42 | kanzure | hello raj12lnm |
| 06:24.55 | raj12lnm | Hi kanzure. |
| 06:26.56 | raj12lnm | The issue is the following. |
| 06:26.59 | kanzure | i merged your branch into master, haven't done a pypi release yet https://github.com/kanzure/python-brlcad/commits/master |
| 06:31.00 | raj12lnm | Ok. . |
| 06:31.15 | raj12lnm | In metaball the issue is the following |
| 06:31.22 | raj12lnm | int *a[5] and int (*a)[5] are two different things |
| 06:31.49 | raj12lnm | And metaball arguments require the later. |
| 06:32.18 | raj12lnm | But the former is written which indeed is a bug |
| 06:32.46 | raj12lnm | kanzure: thanks for the merge. |
| 06:32.47 | kanzure | so nobody has used metaball? |
| 06:32.58 | kanzure | why is it important to test for metaball? i noticed the failing test in python-brlcad. otherwise i wouldn't mind. |
| 06:32.58 | raj12lnm | I think yes. |
| 06:33.45 | raj12lnm | Because the code I have written. Assumes that the change gas been made in the brlcad c repository. |
| 06:34.08 | kanzure | ah, my question is more like, why test for things that nobody uses |
| 06:34.25 | raj12lnm | OK. |
| 06:34.49 | raj12lnm | But the primitive is used. and not mk_metaball(..) |
| 06:34.55 | kanzure | oh |
| 06:35.07 | raj12lnm | Like it is created using the in command |
| 06:35.33 | kanzure | i am sleeping in a few minutes, but one of my goals is to switch away from file-based wdb and only use in-memory wdb |
| 06:35.57 | kanzure | so that modeling does not require file storage until the user calls a save routine |
| 06:36.33 | kanzure | and so that multiple wdb scenes can be modified simultaneously (at the moment, python-brlcad is using globals...) |
| 06:36.50 | raj12lnm | Can you elaborate that further. |
| 06:37.50 | kanzure | example: when you execute the unit tests, it generates files on the file system. whereas with the in-memory wdb functions in brlcad, it wouldn't have to generate files. |
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| 08:49.55 | pandrei | there's something I don't understand regarding bezier segments |
| 08:50.21 | pandrei | specifically bezier_seg which has a *ctl_points array |
| 08:50.41 | pandrei | that struct has no size param, how do you know when you've filled it? |
| 08:50.54 | pandrei | as far as I know C sizeof() doesn't work on pointer |
| 08:51.04 | pandrei | since gibberish can be valid array content |
| 08:51.20 | pandrei | ? |
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| 11:02.20 | gurwinder | hello |
| 11:02.44 | andrei_ | hello |
| 11:02.44 | gurwinder | i want to convert .g file into some another format |
| 11:03.17 | gurwinder | which format is more accurat so that i can render it in POV-ray |
| 11:05.46 | gurwinder | hello andrei, I want to convert .g file into some another format. Which format is more accurate? So that i can render it in POV-ray |
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| 18:20.21 | *** topic/#brlcad is BRL-CAD || http://brlcad.org || logs: http://ibot.rikers.org/%23brlcad/ || GCI winners: Jacob Burroughs and Peter Amidon! || GSoC 2014 selections are announced! Thank you to all we got to work with. Remember that SOCIS is coming up right around the corner and you don't need a summer of code to get involved with open source. |
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| 18:31.48 | raj12lnm | kanzure: I have made metaball independent of mk_metaball function. |
| 18:31.56 | kanzure | okay |
| 18:32.09 | raj12lnm | The test will run. |
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| 18:34.57 | raj12lnm | The earlier version of metaball primitive worked with my local repository. |
| 18:35.15 | raj12lnm | Because the mk_metaball bug was corrected in my local repo. |
| 18:36.16 | raj12lnm | brlcad : your kind attention is required. |
| 18:38.04 | raj12lnm | Mk_metaball function has a bug and it requires changes as per ticket no 278 on sf. |
| 18:38.43 | raj12lnm | The reason being int *a[5] and int (*a)[5] are two different things |
| 18:39.14 | raj12lnm | <PROTECTED> |
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| 19:12.53 | kanzure | spam on this page: http://brlcad.org/wiki/ARL_Technical_Reports |
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| 22:12.00 | hcurtis | I am working some more on my fast4g.c task. Understanding the way pointers work is an important part of this endeavor. I thought my familiarity with them was solid, but I have come to realize that there still are gaps. Before continuing to code, I am reading a good article on pointers (one that is appropriate for my skill level) in order to improve my understanding of them. |
| 22:15.13 | hcurtis | By the way, I have written a new draft of my code; I am trying to convert elements of fast4-g.c from stack allocated to heap allocated. Any feedback is welcome. http://paste.lisp.org/+32AH |
| 22:24.34 | hcurtis | I have tried hard to answer the following important questions for my task, but I have not been successful. I will continue researching them, but I need to ask for help. Do any of you know the answers to these? |
| 22:25.12 | hcurtis | 1. How do I know when the heap memory allocated for the group_head needs to be resized? |
| 22:25.30 | hcurtis | 2. Once I have determined that, how do I know what new size it needs to be? |
| 22:26.13 | hcurtis | 3. Why does the group_head array in fast4-g's commit 56495 hold 11 elements in particular and not some other number of them? |
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| 22:56.03 | Notify | 03BRL-CAD Wiki:Inderpreet * 7315 /wiki/User:Inderpreet/GSoC14/logs: /* Week 5 */ |
| 22:56.17 | Notify | 03BRL-CAD Wiki:Krajkreddy * 7316 /wiki/User:Krajkreddy/GSOC14/summary: /* Week 4 */ |
| 22:56.28 | Notify | 03BRL-CAD Wiki:Albertcoder * 7317 /wiki/User:Albertcoder/GSoC2014/logs: /* Week 5 */ |
| 23:13.02 | hcurtis | It turns out that dereferencing was one of the concepts that I referred to earlier. |