• Log InLog In
  • Register
Liquid`
Team Liquid Liquipedia
EDT 19:31
CEST 01:31
KST 08:31
  • Home
  • Forum
  • Calendar
  • Streams
  • Liquipedia
  • Features
  • Store
  • EPT
  • TL+
  • StarCraft 2
  • Brood War
  • Smash
  • Heroes
  • Counter-Strike
  • Overwatch
  • Liquibet
  • Fantasy StarCraft
  • TLPD
  • StarCraft 2
  • Brood War
  • Blogs
Forum Sidebar
Events/Features
News
Featured News
[ASL22] Ro16 Preview: Rough Waters4[ASL22] Ro24 Preview: Siren's Call8[ASL22] Ro24 Preview: Summer's End9Serral wins HomeStory Cup 2915Serral wins Maestros of the Game 244
Community News
Official StarCraft website teases new content ahead of BlizzCon?85Stellar Fest TWO the Moon (Dec 16-20)9Weekly Cups (August 24-30): Patches' balance mod takes over3New 3v3 BGH Ladder (and more) on ShieldBattery!42Weekly Cups (August 17-23): Zerg dominate the week6
StarCraft 2
General
Balance hotfix patch 5.0.16b (July 16) Nexon wins bid to develop StarCraft IP content, distribute Overwatch mobile game SC4ALL: II Winner Will Earn a Spot at HSC 30! Weekly Cups (August 24-30): Patches' balance mod takes over September World Ranking: herO leads, Serral climbs
Tourneys
2026 GSTL Announcement Sparkling Tuna Cup - Weekly Open Tournament Stellar Fest TWO the Moon (Dec 16-20) IntoTheTV X SOOP SC2 League : Weekly & Monthly SC2 INu's Battles#20 [BO.9]
Strategy
[G] Having the right mentality to improve
Custom Maps
Nexus Wars 2021 GUIDE [M] (2) Industrial Park
External Content
Mutation # 542 The Ascended Mutation # 541 Binary Choice The PondCast: SC2 News & Results Mutation # 540 Dodge This
Brood War
General
New 3v3 BGH Ladder (and more) on ShieldBattery! [ASL22] Ro16 Preview: Rough Waters BGH Auto Balance -> http://bghmmr.eu/ BW General Discussion Official StarCraft website teases new content ahead of BlizzCon?
Tourneys
[ASL22] Ro16 Group A [ASL22] Ro24 Group F [Megathread] Daily Proleagues Brood War in Budapest ! WORTEX 2026 BW Finals
Strategy
Odyssey Mineral Stack Saturation Replay Review Process - What do you do? Game Theory for Starcraft Fighting Spirit mining rates
Other Games
General Games
Nintendo Switch Thread Diablo IV EVE Corporation [Maplestory Hardcore] Let's Play~!! General RTS Discussion Thread
Dota 2
Official 'what is Dota anymore' discussion
League of Legends
[TL LoL EUW IHs] Teemo shall perish TSM pausing esports and CLG Dead
Heroes of the Storm
Heroes of the Storm 2.0
Hearthstone
Deck construction bug
TL Mafia
TL Mafia Power Rank TL Mafia Community Thread NeO.D_StephenKing vs This Guy From 1 Million Dance
Community
General
US Politics Mega-thread UK Politics Mega-thread Russo-Ukrainian War Thread Artificial Intelligence Thread Things Aren’t Peaceful in Palestine
Fan Clubs
MarineLorD Fan Club The Creator Fan Club The ShoWTimE Fan Club
Media & Entertainment
Movie Discussion! Anime Discussion Thread
Sports
Football (Soccer) Thread TeamLiquid Health and Fitness Initiative For 2023 MLB/Baseball 2023 NBA General Discussion
World Cup 2022
Tech Support
Computer Build, Upgrade & Buying Resource Thread
TL Community
The Automated Ban List Northern Ireland Global Starcraft
Blogs
F* the Children and Get Off …
TrAiDoS
Dreaming of BW patches (mod…
c3rberUs
Regacy Esports: The Bh…
regacyesports
LOCKPICKING NOOB
LUCKY_NOOB
Customize Sidebar...

Website Feedback

Closed Threads



Active: 6904 users

BWAPI, and an inside look into StarCraft's code

Forum Index > BW General
Post a Reply
1 2 Next All
Sonko
Profile Joined February 2019
154 Posts
Last Edited: 2019-11-14 14:46:20
October 18 2019 08:40 GMT
#1
Hi dear people of TL forums,

A while ago, I started working on Brood War bot development. During this endeavor, I decided to write a book about it - and one of the chapters of this will be dissecting the code of StarCraft itself. This is quite an undertaking, but I'm making progress with it. Don't let the title "Brood War API" fool you, if you're a gamer, you might still find it interesting!

Here are the posts I have so far. I plan to post updates in this forum in the future, as I publish the episodes:
(Last update: 2019-11-14)

Brood War API – The Comprehensive Guide (of time and space)
Brood War API – The Comprehensive Guide – Distances, high ground, and unit behavior
Brood War API – The Comprehensive Guide – Unit movement, and worker behavior
Brood War API – The Comprehensive Guide: Creating buildings, and everything about the creep
Brood War API – The Comprehensive Guide: Buildings, and placement
Brood War API – The Comprehensive Guide: Movement modifiers, and Terran units
Brood War API – The Comprehensive Guide: Terran units continued, and some Zerg ones


Feel free to ask questions, point out mistakes/typos! I have a pretty good plan how I want to proceed with the topics within the book, and I'd like to publish updates at least weekly.

Enjoy!
Sonko

A site about brood war AI: www.makingcomputerdothings.com
Turbovolver
Profile Blog Joined January 2009
Australia2447 Posts
October 18 2019 11:36 GMT
#2
Nice work! I had a skim through it and even that taught me some things. A question though, what is the deal with detectors and moving? I wasn't aware that moving had any effect on a detector's ability to detect? Or is this just about its "detection region" only being updated every so often, ala sight?
The original Bogus fan.
WombaT
Profile Blog Joined May 2010
Northern Ireland27332 Posts
October 18 2019 11:42 GMT
#3
Ah great, been looking for some light reading material!

Joking aside this is pretty cool, look forward to having a proper look later today.
'You'll always be the cuddly marsupial of my heart, despite the inherent flaws of your ancestry' - Squat
Sonko
Profile Joined February 2019
154 Posts
October 18 2019 11:51 GMT
#4
Thanks for the feedback!
. A question though, what is the deal with detectors and moving? I wasn't aware that moving had any effect on a detector's ability to detect?


I don't really get your question here Can you maybe quote the part that implies that?
A site about brood war AI: www.makingcomputerdothings.com
Turbovolver
Profile Blog Joined January 2009
Australia2447 Posts
Last Edited: 2019-10-18 13:05:20
October 18 2019 13:05 GMT
#5
[quote=Sonko]Detector: If the unit is immobile, it can detect cloaked units within its sight range. If it’ mobile, it’s not constant. Blinded, incomplete, or disabled units cannot detect, and neither do hallucinations.[/quote]
This was the text that I wasn't sure about. "If it's mobile, it's not constant".

I thought that meant moving units versus stopped units, but I'm guessing the distinction is between say, a missile turret and a science vessel? And you just mean that the region detected is not constant for a moving unit?

(which of course makes perfect sense)
The original Bogus fan.
Sonko
Profile Joined February 2019
154 Posts
October 18 2019 13:11 GMT
#6
Yes, you're correct Maybe I'll rephrase that to be more clear.
A site about brood war AI: www.makingcomputerdothings.com
tankgirl
Profile Blog Joined May 2016
Canada528 Posts
October 18 2019 21:21 GMT
#7
How did you get the SC source code?
https://tl.net/forum/brood-war/627255-progamer-settings
TL+ Member
Sonko
Profile Joined February 2019
154 Posts
October 18 2019 21:46 GMT
#8
The short answer is I didn't I use openBW, a decompiled source - see the first article
A site about brood war AI: www.makingcomputerdothings.com
TelecoM
Profile Blog Joined January 2010
United States10841 Posts
October 18 2019 23:25 GMT
#9
Wow this is really interesting stuff... thanks for sharing! The coding is crazy lol
AKA: TelecoM[WHITE] Protoss fighting
Sonko
Profile Joined February 2019
154 Posts
October 19 2019 10:09 GMT
#10
And the next part is here: About buildings, and unit placement. This has been one of the hardest to research so far. Enjoy, and don't hesitate to ask if anything is not clear!
https://makingcomputerdothings.com/brood-war-api-the-comprehensive-guide-buildings-and-placement/
A site about brood war AI: www.makingcomputerdothings.com
Freakling
Profile Joined October 2012
Germany1534 Posts
Last Edited: 2019-10-19 12:55:36
October 19 2019 12:41 GMT
#11
Hero defiler (Unclean One) also has a different collision box than a regular Defiler.

For presenting tile/subtile grids you should better use screenshots from SCMDraft with walkability flag overlay.

People less versed in the OpenBW code, or coding in general, would probably like it if you would explain variable types and other definitions a bit.

The switching into additional terrain flags (cover, terrain level) also comes a bit sudden. You probably should write a more elaborate introduction to terrain flags first (you brush on all of it a bit, but I don't think it is very comprendable without prior knowledge).

The relationship between walkability and buildability is actually… a bit complicated… (Partially) unwalkable, but buildable tiles have some very interesting and useful effects.
PVJ
Profile Blog Joined July 2012
Hungary5221 Posts
October 21 2019 00:03 GMT
#12
Very interesting keep up the good work!
The heart's eternal vow
TelecoM
Profile Blog Joined January 2010
United States10841 Posts
October 21 2019 02:53 GMT
#13
Does APM / speed of hand / latency / ping affect how units work / attack / move or is that all in my head?
AKA: TelecoM[WHITE] Protoss fighting
Sonko
Profile Joined February 2019
154 Posts
October 21 2019 09:03 GMT
#14
"Does APM / speed of hand / latency / ping affect how units work / attack / move or is that all in my head?"

Latency is something you have to compensate for at some point, if you develop an AI. Other than that, they do, but not in the code
A site about brood war AI: www.makingcomputerdothings.com
Sonko
Profile Joined February 2019
154 Posts
October 21 2019 11:48 GMT
#15
And I missed one post:
Creating buildings, and everything about the creep - nipicking/proofreading/questioning of the things are always welcome!
A site about brood war AI: www.makingcomputerdothings.com
Akio
Profile Blog Joined January 2019
Finland1838 Posts
October 21 2019 12:51 GMT
#16
I know close to nothing about coding but this is super interesting! Thanks for sharing
Mine gas, build tanks.
Sonko
Profile Joined February 2019
154 Posts
October 22 2019 21:33 GMT
#17
You're welcome Also, if you want to get into programming, this is a great project. Many students have walked that path before
A site about brood war AI: www.makingcomputerdothings.com
Sonko
Profile Joined February 2019
154 Posts
October 24 2019 09:42 GMT
#18
Thanks everyone for the feedback! I corrected a few minor things, and rephrased stuff. I plan to release the next article soon!
A site about brood war AI: www.makingcomputerdothings.com
[UoN]Sentinel
Profile Blog Joined November 2009
United States11320 Posts
October 26 2019 03:44 GMT
#19
Really enjoyed your series on molesting crabs and such, looking forward to your newest deep dive!
Нас зовет дух отцов, память старых бойцов, дух Москвы и твердыня Полтавы
Sonko
Profile Joined February 2019
154 Posts
October 27 2019 09:23 GMT
#20
And the next part is here. It's a little all over the place, I extended and revised some of the earlier parts, and added stuff here. Anyway, it's about movement modifiers, and code behind Terran units.

Read it here!
A site about brood war AI: www.makingcomputerdothings.com
1 2 Next All
Please log in or register to reply.
Live Events Refresh
Next event in 29m
[ Submit Event ]
Live Streams
Refresh
StarCraft 2
JuggernautJason93
ProTech36
StarCraft: Brood War
Britney 11387
HiyA 101
firebathero 97
TT1 64
Hm[arnc] 23
Yoon 7
GuemChi 1
Dota 2
NeuroSwarm168
League of Legends
Doublelift5544
JimRising 387
Counter-Strike
minikerr33
Other Games
summit1g15451
Liquid`RaSZi2303
Grubby1751
PiGStarcraft300
KnowMe154
ROOTCatZ44
ViBE3
Organizations
Other Games
gamesdonequick2339
BasetradeTV50
[ Show 12 non-featured ]
StarCraft 2
• davetesta4
• AfreecaTV YouTube
• intothetv
• Kozan
• IndyKCrew
• Migwel
StarCraft: Brood War
• BSLYoutube
• STPLYoutube
• ZZZeroYoutube
Dota 2
• masondota22332
Other Games
• imaqtpie2007
• Shiphtur163
Upcoming Events
OSC
29m
Afreeca Starleague
10h 29m
Soma vs Shuttle
BeSt vs Rush
WardiTV Weekly
11h 29m
Monday Night Weeklies
16h 29m
Afreeca Starleague
1d 10h
Leta vs ggaemo
Jaedong vs Queen
GSL
1d 11h
PiGosaur Cup
2 days
Kung Fu Cup
2 days
Replay Cast
3 days
The PondCast
3 days
[ Show More ]
KCM Race Survival
3 days
Escore
4 days
IntoTheTV X SOOP
4 days
CranKy Ducklings
5 days
Sparkling Tuna Cup
6 days
RSL Revival
6 days
Liquipedia Results

Completed

Proleague 2026-09-02
PiG Sty Festival 8.0
Light Tournament 2026

Ongoing

KCM Race Survival 2026 Season 3
K-JUNGMAN
ASL Season 22
Super Anchor Qualifying S3
CSL 2026 AUTUMN (S22)
Acropolis #5
Acropolis #5 - TRS
RSL Revival: Season 6
Calamity Invitational
Big Dog Cup 2026 Div 1
BLAST Open Fall 2026
Esports World Cup 2026
Esports World Cup 2026: LCQ
BLAST Bounty Summer 2026
BLAST Bounty Summer Qual
Stake Ranked Episode 3
XSE Pro League 2026

Upcoming

Escore Tournament S3: King of Kings
Blizzard Classic Cup 2026
Acropolis #5 - GSA
Acropolis #5 - GSB
Acropolis #5 - GSC
SC4ALL II: Brood War
HSC XXX
Stellar Fest 2: Lunar Cup
SC4ALL II: StarCraft II
Kung Fu Cup 2026 Grand Finals
RSL Offline Finals
Stake Ranked Episode 6
BLAST Rivals Fall 2026
IEM Beijing 2026
Stake Ranked Episode 5
PGL Masters Bucharest 2026
1win Private Club #2
Thunderpick World Champ. '26
ESL Pro League Season 24
Stake Ranked Episode 4
1win Private Club #1
Logitech G Play Connect 2026
SL StarSeries Fall 2026
FISSURE Playground #3
TLPD

1. ByuN
2. TY
3. Dark
4. Solar
5. Stats
6. Nerchio
7. sOs
8. soO
9. INnoVation
10. Elazer
1. Rain
2. Flash
3. EffOrt
4. Last
5. Bisu
6. Soulkey
7. Mini
8. Sharp
Sidebar Settings...

Advertising | Privacy Policy | Terms Of Use | Contact Us

Original banner artwork: Jim Warren
The contents of this webpage are copyright © 2026 TLnet. All Rights Reserved.