IRC log for #brlcad on 20140615

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12:47.34*** 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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15:21.12chan_I have exported the BRLCAD script in dxf format and when it is imported in Autcad it gives the following error:Improper table entry name /SPH1 on line 29 invalid or incomplete DXF input--drawing discarded
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19:44.05*** part/#brlcad ishwerdas (~ishwerdas@117.207.157.210)
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20:47.47*** join/#brlcad hcurtis (b82d336f@gateway/web/freenode/ip.184.45.51.111)
20:49.01hcurtisI'd like to talk with a mentor about my fast4-g task.
20:49.10andrei__hey, hcurtis
20:49.14andrei__just ask what you want to ask
20:49.18andrei__someone will answer, eventually
20:49.29andrei__maybe I can help you, even, we'll see
20:49.46hcurtisHi, andrei__.
20:50.06hcurtisLet me get my notes.
20:54.34andrei__also, does anyone know when Daniel(d_rossberg) gets back? Thanks
20:57.39hcurtisI am converting some of the elements of BRL-CAD's fast4-g.c from stack allocated to dynamic. The version of that file serving as the base for my corrections is the one shown in commit 56495. The number 11 appears in lines 213, 907, 1667, and 2943. Possibly, the 11s are to be replaced by a number that the program determines. However, I am stuck because I do not yet understand where the replacement number should come from.
20:58.50hcurtisAlso, I realize that this might not even be the right approach to the problem. I was hoping to find that out before I went any farther down that road (so to speak).
20:59.56andrei__hold on
21:00.12andrei__could you please post your code on pastebin.com
21:01.23hcurtisThe whole fast4-g.c program?
21:01.42andrei__nope, just the part you are working on
21:01.48andrei__and what you don't understand
21:01.54hcurtisOk
21:06.37andrei__you mentioned those lines  in your previous message
21:08.16hcurtisYes. I'm getting the code ready for the pastebin.
21:09.27andrei__Do you understand why do you have to change that?
21:09.32andrei__Why dynamic allocation is better?
21:11.23andrei__I don't mean the textbook answer, just your understanding
21:11.34andrei__cause if you don't, I can give you an example that I believe it ll help
21:17.00hcurtisandrei__: Dynamic (heap) allocation is better because there might be times in which additional memory is needed at runtime to hold the data (more specifically, the lists of regions for groups in BRL-CAD).
21:18.25andrei__you can imagine static(stack allocation) like this: you got a warehouse and only 1 cubic meter boxes.
21:18.53andrei__but all you want to deposit is jewlry. And you put one ring in a 1 cubic meter box.
21:19.00andrei__That's a waste of space, isn't it ?
21:19.15andrei__dynamic allocation means "having boxes" fit to your goods
21:19.52hcurtisYes. Good comparison.
21:20.37hcurtisHere is the code you asked for: http://paste.lisp.org/+3296
21:21.59andrei__you said you can't understand this code
21:22.04andrei__can you tell me what you understood so far?
21:26.41hcurtisI do understand what this (stack-allocation) code is doing. In order to make it dynamic, I will probably need to replace the 11s with a number that the program determines. However, I am stuck because I do not yet understand where the replacement number should come from.
21:30.31andrei__well, but you do know where the number is used
21:30.35andrei__group_head
21:31.06andrei__if you track "group_head" with search
21:31.11andrei__you ll see it doesn't appear too many times
21:31.24andrei__group_head
21:31.26andrei__oups
21:31.39andrei__this one isn't useful, is it?
21:31.39andrei__2937     for (i=0; i<11; i++)
21:31.39andrei__2938         BU_LIST_INIT(&group_head[i].l);
21:32.01andrei__how about line 877 ? :)
21:32.58hcurtiswhich version of fast4-g.c are you using?
21:33.49hcurtisWhen you refer to line 877
21:33.54andrei__http://brlcad.org/xref/source/src/conv/fast4-g.c
21:34.46andrei__http://paste.lisp.org/display/142891
21:34.49andrei__this code
21:36.03hcurtisWe have to be careful when using the xref code. It is not up to date, and I have no idea exactly how old it is.
21:36.25andrei__you re probably right
21:36.38andrei__but I m trying to show you a concept of how to pick the trail of what you need to do
21:36.43andrei__not point to it exactly
21:37.21andrei__if the for goes for 11( which is the static number) it's not useful for you
21:37.33andrei__but in that case, elements where put into the list, without a certain indication of how many
21:37.41andrei__that would be a good place to count them
21:37.48andrei__then you would know what number to use instead of 11 :)
21:37.55andrei__does that seem reasonable?
21:38.47hcurtisYes.
21:39.25hcurtisBut I admit I don't fully understand. I need to examine the code again.
21:39.47andrei__ok, hold up
21:39.54andrei__what don't you understand?
21:40.18andrei__just say it, I've probably asked Daniel(d_rossberg) a dozen retarded questions by now, not everyone sees things the same way :)
21:40.26andrei__doesn't mean that you don't understand because of you
21:43.08hcurtisThe delay is because I didn't really know how to describe what is confusing me.
21:44.33hcurtisI appreciate the fact that you're trying to make me feel better, though. Also, I appreciate your help.
21:46.00andrei__no problem
21:46.11hcurtisHere is what I think you were saying: ptr->region_id/1000 is the number that should replace 11. Right?
21:46.50andrei__not really
21:47.03andrei__ptr->region_id/1000 says what element is selected
21:47.06hcurtisOk. Lol
21:47.09andrei__not how many
21:47.13hcurtisOk
21:48.58andrei__but you can count there, I believe
21:49.17andrei__brlcad or others might know more than me, but I thought I can provide a bit more help than nothing
21:50.32hcurtisThank you very much.
21:50.57andrei__have you ever ran this program?
21:50.59andrei__fast4-g?
21:51.19andrei__you could declare an int and increment it in if, then print it, see what number it shows
21:51.22andrei__it's what I'd do
21:52.42hcurtisI have not run it by itself. It's a part of BRL-CAD that converts the fastgen format to BRL-CAD format.
21:53.36andrei__maybe it has a unit test
21:53.43andrei__try grepping for this function " Add_stragglers_to_groups"
21:53.52andrei__it might be frustrating, but I don t know more than this, sorry :)
21:53.52hcurtisOk
21:54.41hcurtisIt's ok. I just appreciate the fact that you helped me.
22:06.40hcurtis(For anyone who wants to know) I have to go for now, but I will stay logged on. I will return later.
22:10.00starseekervladbogo: please provide the update to the community in the main channel
22:10.39starseekeralso, could you post a link to your log where we can track progress/see screenshots?
22:11.19Notify03BRL-CAD Wiki:Popescu.andrei1991 * 7286 /wiki/User:Popescu.andrei1991/devlogs2014: /* Week 4 */
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23:19.47ankesh11starseeker: http://brlcad.org/wiki/Google_Summer_of_Code/2014 has the links to summaries and logs of all GSoC students.
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