FS2 Data Structure

WARNING: THIS PAGE IS FULLY UNDER DEVELOPMENT !!

Although some expert hand should revise all the page, where I DO HAVE more doubts is marked in blue colour.

Introduction

Through all this page, SCP fs2_open and FRED2_open additions over retail behaviour will be marked in red font.

Apart from the game engine or the mission editor, FRED, the game needs data to run; it needs missions, sounds, 3D models, textures... Freespace2 is highly moddable because nearly none of these data are embedded inside the game executable. In this way the user can always change nearly all game behaviour and appearance.

Like all your applications you'll have Freespace 2 installed in one folder in your hard disk drive. We will call this folder /freespace2, although it can have any other name (/fs2, /fspace2, or whatever). Inside this folder, Freespace 2 stores all its game data in three places (retail version just in two):

1. Unpacked, ie. individual files, inside data folder within Freespace 2 installation folder, ie. in /freespace2/data. (data name is compulsory).
   Inside data folder, the game contents are classified and stored in several subfolders. Below, you have the full list of data subfolders with their description and contents, (remember that all their names are compulsory). The most commonly used and changed are:
   • effects contains all the textures and animations used in all explosions, weapon glows, smoke, particles and so on.
   • maps contains all the textures, (and animated textures), used over ship models.
   • missions contains all the mission (*.FS2) and campaign (*.FC2) definition files.
   • models contains all 3D models (*.POF).
   • music contains all the music files.
   • sounds contains all ingame sound effect files.
   • tables contains all table files. Tables define all the behaviour the game components have. They are the most important thing for modders to know. See Tables section for deeper info.
   • voice contains all the ingame voices.
2. Packed in vp archives. This kind of archives just contain individual files in a similar way as "normal" archives like rar or zip do. They are placed in /freespace2 folder. Special software, like vpmage, is needed to build them.
   vp archives also follow the data structure, so, even while packed in a vp archive, your missions will be in /data/missions and your ship 3D models in /data/models. All retail data come packed in several vps. The next, and only the next, are the original game contents (when patched to v1.2):
   • root_fs2.vp
   • smarty_fs2.vp
   • sparky_fs2.vp
   • sparky_hi_fs2.vp
   • stu_fs2.vp
   • tango1_fs2.vp
   • tango2_fs2.vp
   • tango3_fs2.vp
   • warble_fs2.vp
   • *.MVE movies (cutscenes). They are not originally installed in the user hard disk drive. They are read from game CDs.
3. One of the most important SCP fs2_open additions: Auxiliary data folders loaded through -MOD launcher flag. Retail game only use former both places. But fs2_open, (and FRED2_open), can use any other auxiliary folder in /freespace2 as game data holder. This feature allows installing and using several different mods without having undesired cross-effects.

The most important consequence of having several available locations for game data, is that several versions of each file can exist. There's a priority order between different locations as explained in -MOD launcher flag help. Due to this order, only the highest priority version of each file will be used. This feature allows the user to quickly replace existing mission.fs2 or ShipModel.pof by new or improved versions, placing them in a higher priority place. There's no need to remove obsolete files.

The use of -MOD launcher flag implies that there will be two or more /data folder structures. Some game data, mainly model cache files (*.IBX), can be regenerated by the game itself. Unless explicitly specified, these autogenerated files will be placed in the highest priority /data folder and subfolder.

data subfolders

cache

• Contents: Model cache files. models folder contains raw *.POF 3D model files. But the game has to "compile" them in order to use them. So each original AnyShip.pof generates one compiled and ready to use AnyShip.ibx file.
• Supported files: *.IBX model cache files.
• Notes:
  • The content of this folder can be autogenerated by FS2.
  • Generating cache files takes a bit of time. If you release a pack or mod with a lot of new models, providing their cache files too is a good idea because, on the very first run afterwards, the game will seem hung while it is generating them.
  • FS2 detects model upgrades so it rebuilds cache files if they don't match. BUT sometimes corrupted cache files can cause problems. So sometimes, while debugging or trying to solve problems, deleting cache contents can be useful. (See also -noibx launcher flag help).

cbanims

• Contents: Command and mission briefing animations. (They are assigned to missions through FRED2 editor).
• Supported files: *.ANI animations.

config

• Contents: ???????
• Supported files: *.CFG files.

demos

• Contents: ???????
• Supported files: *.FSD files.

effects

• Contents: Bitmaps and animations for every game effect:
  • All the explosions and weapon effects.
  • Damage smoke animation.
  • Particle animations.
  • Thruster glows and afterburner trails.
  • All the background images, sun bitmaps, sun glares and space motion debris (see Star.tbl table).
  • Warp-in / warp-out animations.
  • Anything more you can think of in this category. If you have a texture which you know it doesn't belong to maps folder, put it here. If you have doubts, put it here too.
• Supported files:
  • Retail FS2: *.PCX for bitmaps, (example, backgrounds) and *.ANI for animations (example: explosions).
  • SCP fs2_open: Both formats and *.DDS, *.JPG and *.TGA for bitmaps, and *.EFF for animations.
• Notes:
  • Some effect bitmaps or animations can be assigned by table entries. But the name of many others is hardcoded, (example particlesmoke01).
  • Not all the effects support animations. Example background bitmaps.
  • *.DDS and *.EFF are the preferred formats.
  • Till version 3.6.9. (included), *.JPG and *.TGA formats require the usage of -jpgtga launcher flag. If not used they will be ignored. From this version, all the supported formats are always used.
  • See Texturing section for important info about this aspect of the game. It is more important for maps folder contents, (ie. ship textures), but it also applies here.

fonts

• Contents: ???????
• Supported files: *.vf files.

force feedback

• Contents: ???????
• Supported files: ???????

freddocs

• Contents: ???????
• Supported files: ???????

hud

• Contents: All HUD building bricks. Anything you see on your HUD while flying is defined through this folder contents.
• Supported files: *.PCX and *.ANI
• Notes:
  • Most of this folder contents have a hardcoded name.
  • Most of this folder contents are "false" animations. It means that the *.ANI file is only used to pack several related bitmaps. Example: every ship shield graphics use five bitmaps, (the ship bitmap and then front, right, back and left shield quadrants) packed in one *.ANI.

intelanims

• Contents: Intelligence animations used in Technical Database > Intelligence section.
• Supported files: *.ANI animations.

interface

• Contents:
  • All the game screens and mission loading screens.
  • All the button, mouse and icon bitmaps.
  • Map ship icons in Briefing screen.
  • Ship and weapon animations in Ship selection and Weapon loadout screens. These weapon animations are also used in Technical Database > Weapons section.
• Supported files: *.ANI animations and *.PCX bitmaps.
• Notes:
  • Most people use -ship_choice_3d launcher flag. With this flag, only primary weapon animations are needed in Weapon loadout screen. There's no need for ship or secondary weapon animations. Even, some mods need a compulsory use of this flag.

maps

• Contents: All the textures used by 3D *.POF models. *.POF models use textures to "paint" their surfaces and to simulate glow points. *.POF files only have links to the names of their used textures, they don't have embedded textures. All their used textures are read from this folder.
• Supported files:
  • Retail FS2: *.PCX bitmaps.
  • SCP fs2_open: The former one and *.DDS, *.JPG and *.TGA formats. Some of the textures, (example: glow maps), support animated textures so *.EFF and *.ANI are also supported.
• Notes:
  • See Texturing section for important info about this aspect of the game.
  • *.DDS and *.EFF are the preferred formats.
  • Till version 3.6.9. (included), *.JPG and *.TGA formats require the usage of -jpgtga launcher flag. If not used they will be ignored. From this version, all the supported formats are always used.

missions

• Contents: All the mission and campaign files.
• Supported files: Each mission is one *.FS2 file and each campaign is one *.FC2 file.
  • *.NTL and *.SSV files ?????
• Notes:
  • In Mission Simulator screen, Single Missions are just available *.FS2 mission files which are not pointed by any of the available *.FC2 campaign files. This is the only way to play this kind of missions.

models

• Contents: All the 3D models used by ships, asteroid and debris fields, missiles, subspace model, 3D shockwaves, 3D warp-in/warp-out effects and background star-holding model.
• Supported files: *.POF model files.
• Notes:
  • *.POF models have direct relation with maps and cache folder contents.
  • 3D warp-in/warp-out effects need the usage of -3dwarp launcher flag.

movies

• Contents: Game cutscenes.
• Supported files: *.MVE, *.OGG, *.AVI and *.MPG clip files.
• Notes:
  • This folder is a fully SCP addition. Retail game reads *.MVE cutscenes from game CDs.
  • *.AVI and *.MPG formats are decoded through system player. It's support is not guaranteed in future fs2_open versions.
  • Retail uncompressed *.MVE and Theora compressed *.OGG formats are the preferred ones. fs2_open has built-in support for them both.
  • All the movies can have custom names, (their loading time is defined in FRED), but start-up movie. This movie must be called Intro.

multidata

• Contents: ???????
• Supported files: *.PCX and *.FS2 files. ???????

music

• Contents: Music files used through Music.tbl table.
• Supported files:
  • Retail: *.WAV sound clips.
  • SCP fs2_open: Adds support for compressed *.OGG Vorbis sound clips.