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Daily log:
Daily log:
This year's GSoC was my first and most exciting projects given the fact that I'm working on my first opensource project and contributing for my first time to a great software and organization like BRL-CAD.
For the past three months I worked on implementing a pull routine which reversed the effects of a push on a CSG tree. This project focused on reversing the effects of the push command available in BRL-CAD and also pulling up and unpushed node. While following my implementation outline as described in my [http://brlcad.org/wiki/User:NyahCh3ck20/GSOC13/Design_Document Design Document], I kept modifying the plan as needed and tried updating my [http://brlcad.org/wiki/User:NyahCh3ck20/GSoc2013/Coding_Report logs] daily especially when I initially had no stable Internet access.
Before the Mid-term Evaluations, I studied the push and xpush routines seeing how the matrices were pushed down the tree in respective commands and started implementing and finished implementing the pull_comb() routine which pulls the matrix transformations in a combination node. Submitted patches on sourceforge for review. I tested various parts of the routine and made sure routine works perfectly will continue testing and fixing bugs if any post GSoC to make sure command is complete. Also, I wrote tests for the poly.c routines and submitted patches on sourceforge; tested the bn_mat_inverse() routine implemented for BRL-CAD and proposed new routine  which are still awaiting review by mentors.
Post Mid-term evaluations, I studied the various primitives trying to figure out how to implement the pull_leaf() routine for each primitive which was later disproved by Sean as a bad design choice which led to my implementing of the pull_leaf() using the AABB's of primitives which enabled me to pull translation components successfully. I also developed the pull interface, wrote regression tests, created the man pages and other documentation which will integrate command fully into BRL-CAD.
During Final Days and Post-GSoC I plan to finish implementing the pull_leaf routine which pulls both the scale and rotation components of primitives for BRL-CAD completing the pull routine and any other new projects as needed.
This was one of the most exciting summers of my life.
=== Test Results ===
* Pulling unpushed object pulls matrix transformations up the tree.
[http://brlcad.org/wiki/File:Pushed_pulled_object.png pull_unpushed_obj]
*Pushing object after pull restores original matrix conditions.
[http://brlcad.org/wiki/File:Pushed_pulled_object.png push_pulled_obj]
==17 June - 23 June==
==17 June - 23 June==
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* Resolved an issue with test but seg fault still lurks somewhere in code; been starting for over an hour and still getting nowhere. Will look at that tomorrow.
* Resolved an issue with test but seg fault still lurks somewhere in code; been starting for over an hour and still getting nowhere. Will look at that tomorrow.
Friday Aug 16, 2013
*Fixed the bn_poly_synthetic_division() unit test and uploaded code to sourceforge.
* Started looking at the db_preorder_traverse() routine ( although its not clear what struct db_traverse is since i don't see definition in source code) and how I could use it in implementing pull routine.
* To ask about definition of db_traverse since i don't see in source code.
Saturday Aug 17, 2013
*Reworked the accepted patches and submitted patch on sourceforge.
*Fixed the bn_poly_quadratic_roots() routine and submitted code on sourceforge.
*Started working on plan to implement pull using the db_preorder_traverse() which will need some routines to work with combinations and extract matrix transoformations from primitives
ToDo: To start working on the leaf_mat() routine which extracts matrix transformation from primitive.
== 19 August - 25 August  ==
== 19 August - 25 August  ==
Monday August 19, 2013
= Original Timeline =
* Started reworking the pull_leaf routine to use db_functree instead of db_preorder_walk but may still use later to extract matrix transformation from primitives and continue walking up the tree. Still to ask on mailing which primitives to support first.
* Wrote the comb_enter_func() which restores the matrix transformations of a combination but is still dependent on pull_leaf() which is to deal with various primitives. To ask sean how to store changes on a combination matrix.
ToDo: Continue implementing pull_leaf() adding support to pull matrix transformation from torus then, spheres, ellipsoids and in that order.
Still wondering why commit access is not coming!
Tuesday August 20, 2013
*Finished Writing the pull_comb() routine together with the pull_comb_mat() routines. Discussed with Sean about test driven development. Will start writing unit test for routines tomorrow
*Looked into BRL-CAD source on how to write pull_leaf() routines which will support various primitives in the pull process since they don't have matrix transformation as such. Still to look at pull_leaf to actually see how they dealt with primitives
Wednesday August 21, 2013
*Started looking at test provided by Sean to use of db_walk_tree so as to be able to create a similar for pull_comb using db_functree() but faced problems calling functions in BRL-CAD's libraries. So i'll continue working on test tomorrow
*Continued adding some functionalities to pull_leaf() routine.(still crude) will continue work on pull_leaf after testing pull_comb() perfectly
Thursday August 22, 2013
*Started and finished writing pull_comb() unit test. But there is actually a seg fault which prevents the cur_mat() pointer from being inverted. Probably NULL.
*Will continue debugging and finish testing pull_comb() tomorrow then move on to pull_leaf()
Friday August 23, 2013
*Finished debugging pull_comb() and tested routine. Works perfectly.
Any way to note changes made on combination. pulled matrix is stored on
*Created patch to stub empty pull routine into brlcad. then continue working on pull_leaf() routine tomorrow.
* Waiting for mentors to apply patch so i could create patch which adds pull_comb() routine into BRL-CAD.
== Aug 26 -  Sept 01  ==
Monday 26 August 2013
* Started implementing the pull_leaf routine which extracts the 4x4 matrix transformations for a primitive. Succeeeded in implementing the pull_leaf for an ellipse, sphere, EPH, elliptical parabola, elliptical torus, extrude, hyperbola, and a particle.
* started testing function and will continue debugging tomorrow before continuing with the addition of the superellipse, metaball, arbitrary complex polyhedra, arb8, rhc, rpc, and pipe.
Tuesday 27 August 2013
*Finished debugging pull_leaf() but routine is incomplete since I don't currently support all primitives. Will follow Sean's instructions and start developing pull interface from tomorrow by adding synopsis, docs, full integration and test cases.
*Added support for truncated cones in pull_leaf() but a bug hangs in there. Will take a peek tomorrow or finish this night before going to sleep.
Wednesday August 28, 2013
*Started developing the interface by adding the stubbing the pull to archer  interface.
*Added the pull routine to the tclscripts, libtclcad, and wrote the pull documentation in brlcad/doc/ directories.
Still to finish writing the regresssion tests before moving on to adding  support for pulling primitives on BRL-CAD.
Thursday August 29, 2013
*Started and finished writing the regression tests for the pull command.
*Tested and compiled code but pull does not appear on the command line when regression tests are ran. Will ask on IRC for assistance here.
Todo: When done with developing the pull interface, I'll dive into writing the pull_leaf routine for all primitives.
Friday August 30, 2013
*Tested regression tests for pull and added manual pages and documentation for pull successfully such as in man pages, appropos library for pull
*To create patch and submit on sourceforge, also tried adding pull to archer but found a little problem. To discuss with mentor on how to proceed.
TodO: After approval of man pages, to continue adding support for all primitives into pull command. and fix bn_poly_sub() test patch.
Saturday August 31, 2013
*Finished testing regression tests and uploaded code to sourceforge
* Continued looking at the primitives such as arb8, arbn so as to continue working on primitives for pull.
== Sept 02 - Sept 08  ==
Monday Sept 02
*Started looking at the other primitives; left to complete the pull_leaf() routine. Saw many complications with many primitives. Will need the Assistance of Sean in extracting the matrix transformations from them.
Tuesday Sept 03
*Fixed bug in bn_poly_sub() unit test; uploaded code to [https://sourceforge.net/p/brlcad/patches/224/ sourceforge].
*Succeeded in pulling the following primitives(TGC, REC, PARTICLE, EPA, EHY, HYP, ETO, EXTRUDE). Still left with about 26 primitives to be pulled in order to complete the pull_leaf() routine.
Will need some directions on how to implement pull_leaf() since using switch case statements is not a good design choice.
Thursday05 - Sunday 08
*Took a break so as to recover from malaria.
== Sept 09 - Sept 15  ==
Monday 09 October
*Started looking at AABB bbox routines in BRL-CAD. Still to develop simple algorithm that automatically processes the translation from bbox return vectors to determine original translation.
*Read some online wiki pages on AABB bounding box of objects.
ToDO: To start writing routine and unit test tomorrow
Tuesday 10 October
*Started and finished writing tranlate routine which extracts and sets the translation component from the bounding box minimum and maximum points from the bounding box routine.
*To integrate general bounding box calculating function for every primitive.
Wednesday 11 October
* Started testing pull_leaf routine using the rt_functab bbox routine and successfully pulled some translations assuming object's centrepoint was translated from the origin(0,0,0). But still waiting on Sean for some clarifications on the math.
Since i'll have to attend the Google Student Ambassador's summit in the first days of July and exams begin on the early part of July i'll move some of the work overhead to june when coding begins.
*To look at confirmation from sean and perfect the pull_leaf routine, completing the pull routine and running through valgrind.
Thursday 12 October
*Perfected math on moving bounding box and primitive to origin before extracting translation. But will start testing tomorrow.
===Community Bonding Period ===
    May 30
June 13
TODO: combination of push and xpush routine.
      changed xpush to push -x
Friday 13 October
June 14:
    Integration into MGED and tests of new command.
*Successfully wrote the pull_leaf routine which pulled the translation components of the primitive.
*Tested routine together with the pull_combination routines and successfully moved the matrices right up to the root of the tree. but still unclear with cases where the matrix transformations for the combinations is NAN.
* Submitted [https://sourceforge.net/p/brlcad/patches/215/ patch] on sf and awaiting review before moving on to porting command to archer since i've not been granted commit access.
== Sept 16 - Sept 22  ==
Monday Sept 16,
*Started re-testing the pull routine starting from the pull_leaf which pulled correctly.
*Discovered a bug with the pull_comb() routine which pulls matrices which are not symmetric;so will fix bug tomorrow.
*Started stubbing pull to archer but had an error will try to fix problem tomorrow or post question on mailing list and see what comes up.
Tuesday Sept 17
*Continued testing the pull_leaf and realised NAN values were being pulled from the primitives which are to be set to zero in such cases.
*Started fixing bug.
Wednesday Sept 18
* Continued fixing pull_leaf routine but realised pull_comb() routine pulled matrix transformations having NAN as values. to ask mentors about this problem if it persists.
* Was in a meeting with the Vice Chancellor as Google Student Ambassador and explained my Vision for the University during my tenure.
Thursday Sept 19
* Started preparing for my upcoming exams next week; and had a meeting with the Public relations Officer of the University concerning my recent appointment as Google Student Ambassador and plans for the University community.
Friday Sept 20
* Attended the Interview at the University Media House( Chariot FM) where I explained my GSoC experience and current work as Google Student Ambassador.
Saturday Sept 21
*Wrote the Project summary and continued preparing for my exams next week.
== Sept 23 - Sept 28  ==
#Monday Sept 23
Started looking at the BRL-CAD documentation spreadsheet posted by Harmanpreet and summarising all documents on the list. Requested for the script from Harmanpreet that automates the summary of the documents.
@Will finish summarising documents tomorrow; since I have to prepare for some of my exams coming up from tomorrow.

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