View source for Under The Hood

Information in this section cracks open the bonnet and attempts to explain the how and why questions on a variety of aspects of the inner workings of the games, such as formulas and other odds and ends like reproduceable game bugs or useful 'glitches'. (Note this does ''not'' include technical bugs) 

As we don't have the source code, quite a lot of the information here is derived the traditional way, with paper, pen and lots of free time. 

Note: It is hoped that the following articles will be incorporated into their related sections at a later date - where and when ever possible (reactions under stats, phantom radars under general radar information, etc). Also duplicate entries will need to be cleared out.  

== General ==
*[[Base_Facilities_(UFO_Defense)#Single_Use_Facilities|Radars]] - how they work, and why build only one of each type. (Plus, the [[User_talk:NKF#Phantom_Radar|phantom radar]] "trick") 
*Where do [[area-effect weapons]] harm you? 
*[[Damage]] (Damage to units and terrain)
*Calculating [[recovery time]] for injured soldiers 
*[[Accuracy formula]]
*[[Reaction fire formula]]
*[[Motion scanner blip sizes]]
*[[Psionics]] - How a psionic attack works 
*[[Throwing_Accuracy#Throwing_Distance|Throwing distances]] 
*[[Item_Weight|Item weights]] and how they correlate with [[Strength]]
*Weapon comparison tables
*Unit spawn priorities 
*How much does it cost to [[Base_Defense#To_Surrender_or_Not_To_Surrender|lose a base]]
*The dire consequences of picking up [[unconscious]] units 
*[[Alien movement patterns]]
*Secret weapons and items such as Gatling Laser discovered in [[Item Weight]] table

== Useful Glitches, Workarounds or Just Plain Odd Stuff ==
See also [[Exploits]]
*Free Ammo for tanks on [[Base_Defense#Bugs|Base Defense]] missions 
*Straight lines and the equator - getting a little more range from your ships with the [[Great Circle Route]]
*Stacking bug (UFO only) and Activating [[Melee Accuracy|Melee Attacks]] - see [[Stun Rod]] notes
*The [[Medi-Kit]] heal-through-wall trick 
*Hitting multiple targets with [[incendiary]] effects
*The oddities of [[data corruption]]
*The oddities of mind control/molecular control
**[[Why civilians go rogue]]  
**[[Large units]] and [[Psionics]]
**[[Gaining permanent control of a Chryssalid/Tentaculat]]
**Zombie's patented permanent mind control by stunning technique
* Spawn locations in [[Base Defense]] missions and how to make the ultimate "hands off" base.

== Not so useful Glitches ==
''See also [[Known Bugs]].''
*Glitches with the Gauss SWS (TFTD only)
*[[Ufo Names in Tftd]] (TFTD only) 
*[[Vertical waypoint bug]] (Collectors Edition only) - Blaster bombs go south instead of straight down.
*[[Proximity mine bug]] - if nobody explodes the proximity mine, something else may explode in the future.
*[[Disappearing ammo bug]]- partly used clips are discarded. XCOMUTIL fixes.
*Ctrl+C - why it does what it does and why you shouldn't exploit it. (Dos versions only, where GEOSCAPE and BATTLESCAPE are separate programs connected by a batch file.)
*"My body is a weapon" - Alien corpses sometimes contain an ammo clip.  Probably another case of [[data corruption]]
*Unresearched alien weapons can not be thrown. (Items need a [[Item_Weight|weight]] to be thrown, and you don't know its weight until you research it.)

== Game File Analysis ==
Not-for-profit-just-for-fun reverse engineering.

* General note re: [[HackerTools|hex editing game files]]
*[[GEODATA]] - Text for localization.
*[[GEOGRAPH]] - Graphics for UFOpaedia and research screen backgrounds.
*[[MAPS]] - Pre-generated Battlescape terrain blocks (.MAP). These are filled in with terrain tiles. A few dozen blocks make up a battlescape.
*MISSDAT\DUM.BIN - placeholder
*[[ROUTES]] - Alien route maps (.RMP) for moving around the pre-generated Battlescape terrain blocks.
*[[SOUND]] - 1990-era sound drivers, or MIDI files for Windows version.
*[[TERRAIN]] - Battlescape graphic tiles for buildings, ships, and terrain.
*UFO2EXE\TACTICAL.EXE - The "Battlescape" program in DOS-release of UFO.
*UFOEXE\[[GEOSCAPE.EXE]] - The "Geoscape" program that handles base management and aircraft.
*UFOEXE\BLACK.EXE - The black screen UFO.BAT puts up when swapping between the above two programs.
*[[UFOGRAPH]] - Misc graphics (.PCK) for soldier equipment screens, smoke, motion detector blobs
*[[UFOINTRO]] - Holds the introduction movie (.FLI) and the endgame pictures (.LBM)
*[[UNITS]] - Battlescape graphics for soldiers, aliens, and the pixelated guns they hold. (.PCK)
*Stub for the moment - a link to [http://www.daishiva.com/phpBB2/generic.php?page=progLinks.shtml DaiShiva's] miscellaneous [http://www.daishiva.com/programs/XCFormat.html file formats], including many of the above. Until this section gets fleshed out.

*'''[[Saved Game Files]]''' including [[UNITREF.DAT]]

*Why February is special - it has 31 days