[Soc-2017-dev] Weekly Report #07 - Sculpting Brush

[Raja Kedia]

Hello Developers,


*What I done this week:*

First of all as per my target, I started with dynamic array implementation
in my brush. LetterRip and mont29 suggested to check BLI_array.c and use
BLI_array function to increase array size dynamically and according to use.
Still, there was some minor implementation problem as it was not working as
expected rather there were few crashes. I changed my focus to dyntopo mode
implementation before dynamic array as after dynamic array implementation,
if there would be any problem in dyntopo then it would be difficult to
remove.


Now in dyntopo correction, the problem I was facing was related to
continuous vertex index changing due to multithreading. While, storing
index, I tried to limit threading and also imitate cache->first_time to
create something like second_time in cache for calculation. The advantage
of using second_time could be that it can calculate central vertex as a
whole and it might not be affected by multithreading. But still no
achievement was there. It was working same as before. I was thinking of
stopping multithtreading for time being and I asked mont29 and LetterRip in
irc and they hinted me to make brush work without interrupting
multithreading as it won’t be a great idea. I tried BLI_mutex and related
function (inspired from layer brush) but still there was nothing much that
I gained.


Finally, LetterRip hinted me to checked what is the coordinate status while
using brush. I checked and since grab brush uses original coordinate, we
thought of using coordinate as index. I tried studying more about bm_log
functions and it was a bit helpful. Finally I was able to develop topograb
brush which is working in dyntopo without crashes( still there is some
error related to mirroring in dyntopo but it can be solved easily now).



*What I will do next week:*

This week, I might be able to complete topograb brush and it can possibly
be tested by artist. Most of the things and code development has already
been done and there are still a few error to fix. Next, it should be fully
functional while using dyntopo mode without any crashes. I will be trying
to deliver this brush by next week.

Thank you.
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