Difference between revisions of "CFG File Documentation"

Latest revision as of 06:31, 2 January 2022

Configuration files are text files used to specify, store and adjust information for various parts of the game in a human-readable manner. They most commonly use the .cfg file extension, but this is not always the case. The most commonly referenced cfg files are part configurations. These are used to change settings for the part such as mass, size and cost, as well as adding, removing or adjusting part modules, for example increasing an engine's thrust or adding resource storage capacity.

Config Format

The config format used in Kerbal Space Program is NOT a Unity class, but specific to KSP.

KSP reads .cfg files into config nodes. Config nodes can contain values (serialized versions of all sorts of data types) or other config nodes. See the C# class documentation in the KSP API Documentation for more details.

Module Manager

The stock config is very simple - nodes and values, which are nothing more than tree nodes and strings. Parsing is handled by modules that use .cfg files. See KSPField in the API.

The mod Module Manager adds powerful filtering and extension capabilities to the Config Node format. If you see an @ signs, []'s, or it looks like programming, the config is using Module Manager. It is well documented in the forum thread and on sarbian's Gitub.

Basic Part Making Guidelines

Every part consists of multiple files, including the configuration file, a model and a collision mesh. Under the 0.25 standards, the model and collision mesh must both have a material assigned when creating them in your modeling software and prior to export for use. I am not a modeler, so I will leave that guidance to someone more qualified.

When creating a new part, each of these files (including additional models and meshes, if needed) should all be contained in a single folder which describes or names the part. Even though Squad themselves are horribly inconsistent when building parts, it is best to have the name of the folder, and the names of each of the meshes match the name of the part inside the cfg file (not the name that you see in the parts building! More on that later).

If you making more than a few parts, you may want to create a folder for each type of part. This is certainly an acceptable practice, and one that Squad uses themselves. For example: /Engines/ to place all of your engine designs inside.

If you are making a mod that does things other than just provide a stock-capable parts pack, you may want a more subfolders, one for parts, one for agencies, another for contracts, etc, etc.

No matter how deep you nest your mods' folders, your mod itself should be contained within the /GameData folder with a name that uniquely identifies your mod. It would be wise to name this folder the same as you are marketing your mod (ie: GameData\Modular Kolonization System\ is advertised as Modular Kolonization System or GameData\MechJeb is advertised as MechJeb) (and yes, I know that I'm using examples which actively violate this principle!)

So, I wrote a mod (let's call it ShadowSplat) that modifies some resources, adds a few agencies, and massively updates the parts pack including new engines, fuel tanks, science containers, and electrics. My folder structure might look like this:

KSP_win\GameData\ShadowSplat\
KSP_win\GameData\ShadowSplat\Agencies
KSP_win\GameData\ShadowSplat\Resources
KSP_win\GameData\ShadowSplat\Parts
KSP_win\GameData\ShadowSplat\Parts\Engine
KSP_win\GameData\ShadowSplat\Parts\FuelTank
KSP_win\GameData\ShadowSplat\Parts\Science
KSP_win\GameData\ShadowSplat\Parts\Electrical

PARTS Configuration Files

As of at least 0.24.2^[outdated], the order of the configuration file matters very little. As far as I can tell, you can throw just about anything you want in there in any order. However, for compatability and error-checking reasons, it's best to follow the general structure that exists within stock parts. Many of the stock parts contain commenting-out lines to help you decode where things should go, but, here's a general breakdown, using a mythological part (let's call it "DoesItAll"). DoesItAll will exist in this foldier:

KSP_win\GameData\ShadowSplat\Parts\Engine\DoesItAll

and will consist of the files:

KSP_win\GameData\ShadowSplat\Parts\Engine\DoesItAll.cfg
KSP_win\GameData\ShadowSplat\Parts\Engine\DoesItAll.mu
KSP_win\GameData\ShadowSplat\Parts\Engine\DoesItAll.mbm

Note: this is a general explanation. Additional information can be found be clicking the provided links:

General Parameters

Model Parameters

At this point, you can use the deprecated style of mesh on a line by itself, or open a new sub called MODEL. The preferred method is to use MODEL:

If you do not use MODEL, you must use mesh to define the parts collision mesh, like so:

Asset Parameters

Node Definitions

So, node definitions are a little weird. You don't have to use any, and you *can use a whole bunch. Defines where parts attach to other parts. Tricouplers have four: three bottom and one at the top, while most parts simply have two, and a few parts have only one.

Node stack defines where the part vertically stacks with other parts, and node attach defines where on a part's surface other parts attach - in other words, horizontal attachment.

The attachment values relate to an object's origin, and their values correspond to a model's units and scaling factors. A node_stack_bottom with x, y, and z values of (2.5, 5.0, 3.0) will have an attachment node 2.5 units to the right, 5.0 units up, and 3.0 units forward. The next three values refer to the orientation that a particular node will accept other attachments, on a scale of -1.0 to 1.0. These represent the vector that a part will orient itself on when attaching to the node. For example, a fuel tank with a node_stack_bottom will have angx, angy, and angz values of (0.0, -1.0, 0.0). This represents a vector downward relative to the part model, in the negative y direction. A value of (0.0, -1.0, 1.0) would represent a diagonal vector downward and forward, while a value of (1.0, 1.0, 1.0) would represent a vector to the right, up, and forward.

Generally, most parts will have angx, angy, and angz values of either (0.0, -1.0, 0.0) for a node_stack_bottom and (0.0, 1.0, 0.0) for a node_stack_top.

The last value indicates the visual size of an attachment node. Values may be either 0 (small half-meter node), 1 (normal), or 2 (large). This parameter is optional and will default to 1 if nothing is specified.

Keep in mind, naming conventions (_stack_bottom, _stack_top) for nodes only apply to node_stack; they are only helpful in identifying a node's position.

Known node definitions are listed below:

• node_stack_top
• node_stack_bottom
• node_stack_top2
• node_stack_bottom2
• node_stack_connect01
• node_stack_connect02
• node_stack_connect03
• node_attach
• node_stack_bottom01
• node_stack_bottom02
• node_stack_bottom03
• node_stack_bottom04

Each one follows this example, and specifies where other parts can connect to this part:

node_stack_bottom = x, y, z, angx, angy, angz, size
node_stack_top = x, y, z, angx, angy, angz, size
node_attach = x, y, z, angx, angy, angz, size

FX definitions

FX definitions specify visual effects associated with this part, including engine exhausts, explosions, and coloration. Each one is a unique effect, and the only parameters they take is the location/offset that the effect occurs at. The 'active' switch on the end is used to define when this effect will be visible. See the FX Groups listing to know which effect groups are available, and when they are used. It's also possible to assign an effect to more than just one FX Group. If for instance, you want a smoke effect to be visible both when the part activates and also when it deactivates itself, you can do this:

fx_gasBurst_white = x, y, z, angx, angy, angz, activate, deactivate

This is particularly useful if you're defining a lot of effects, like the gas discharges on an RCS module.

 fx_exhaustFlame_yellow = x, y, z, angx, angy, angz, active
 fx_exhaustLight_yellow = x, y, z, angx, angy, angz, active
 fx_smokeTrail_medium = x, y, z, angx, angy, angz, active

Known FX calls are listed below:

• fx_exhaustFlame_blue_small
• fx_exhaustFlame_yellow
• fx_exhaustFlame_yellow_tiny
• fx_exhaustFlame_blue
• fx_exhaustFlame_white_tiny
• fx_exhaustLight_yellow
• fx_exhaustLight_blue
• fx_smokeTrail_medium
• fx_smokeTrail_light
• fx_gasBurst_white
• fx_exhaustSparks_flameout
• fx_exhaustSparks_flameout_2
• fx_exhaustSparks_yellow

Module Parameters for PREFAB_PARTICLE and MODEL_MULTI_PARTICLE:

Example taken from the config file for the S3 KS-25 "Vector" Liquid Fuel Engine:

PREFAB_PARTICLE
{
	prefabName = fx_smokeTrail_light
	transformName = smokePoint
	emission = 0.0 0.0
	emission = 0.05 0.0
	emission = 0.075 0.25
	emission = 1.0 1.25
	speed = 0.0 0.25
	speed = 1.0 1.0
	localOffset = 0, 0, 0
}

Sound FX definitions

Just like Visual effects, sound effects specify an effect to be used by the part. Sound effects are coded using a two-sided equation, the left side specifies the sound or sound file to be used, whereas the right side specifies when to use that particular sound. Known Sound Effects definitions are:

This is pretty easy to use in a basic way, which will suit our needs just fine.

Under this section, comes:

sound_vent_medium = activate
sound_rocket_hard = active
sound_vent_soft = deactivate

Sounds are added to FX Groups, in much the same way smoke and flame effects are. Of course, sounds do not need to be positioned in space, nor do they have rotations, so all you need is to indicate in which FX Group the sound will be executed. As with effects, you can assign multiple groups to a sound.

Since 0.20 GameData structure there are 2 ways to add a sound to a part:

• KSP has an internal sound library, which contains a few sound effects. By defining a sound as in the example above, KSP will search for that sound in its internal library.
• The second way is to add new sound files which is ONLY possible if adding the sound file to the GameData/modName/parts/partName/part/sounds/ folder. Note that all the sounds are therefore "private", only accessed by that part. For now, the legacy folder or a shared mod folder method doesn't work, devs are probably going to fix this problem in the future.

REMEMBER: If you add a custom sound, the file name must start with sound_ (e.g., sound_myNewSoundEffect.wav).

To use a sound from the KSP internal library or the part/sounds folder, you must not include the extension in the sound name (e.g., sound_vent_medium = activate), otherwise the sound will not work.

Supported files are 48000 Hz .wav files and .ogg

These are the paired sound types and part statuses.

Editor Parameters

Attachment rules

attachRules defines how this part attaches to or allows attachments from other parts. Though documented in some part files, the documentation is minimalist and difficult to understand, so here's a little clean-up and expansion.

• // attachment rules: stack, srfAttach, allowStack, allowSrfAttach, allowCollision
• attachRules = 1,1,1,1,1

The rules correspond to the numbers below - 1 is allow, 0 is prevent. The tags are:

stack - Can your part be stacked on others?

SrfAttach - Can your part be placed onto a surface?

allowStack - Will you allow other parts to be stacked on your part?

allowSrfAttach Can other parts be placed on the surface of yours?

allowCollision - A special one: Can your part be placed if part of it is intersecting another part?

Note that you can also force parts attached to this part to attach in a specific symmetry.

• // symmetry rules: 0=1x, 1=2x, 2=3x, 3=4x and so on...
• stackSymmetry = 3

Standard Part Parameters

This defines how your part performs in the air and its limits. Note that not all of these parameters need to be defined. If they're left out of the cfg file, KSP will use a default value for them. Standard part parameters indicate how the part interacts with the environment in flight mode. From mounting on the launch platform or the runway through take-off and atmospheric interactions to landing and blowing up, this is where physics enters the game

MODULES

Each Configuration file is composed of several sections. Some of these sections are standardized across all parts, others are specific to specific part types. To build or modify a successful part, it is necessary to have an understanding of what each section does, and within those sections what each line of configuration actually does, and what the options are for those lines. This Definitions file will attempt to address each of those questions in turn and is current as of [0.25.0]

Notes: It appears that, with a few exceptions, all definitions can occur in any order in the PART file. Free arrangement is valid for MODEL {}, INTERNAL {}, MODULE {},

MODULEs define what specific parts can do. They are generally calls to C-coded or hard-coded functions that define what functionality these parts have in-game.

name names define the module in use and are a general indication of what the module subtype does. Specific variables are associated with each MODULE.[name]. For example, the Clamp-O-Tron Docking Port Sr. has the MODULE.name ModuleDockingNode and its' associates variables are [referenceAttachNode] and [nodeType]. Some MODULEs share variables with other MODULEs, which can make deciphering their purpose difficult.

known MODULEs, their associated variables, and the meanings of those variables will be explained below.

INTERNAL

Internal specifies the internal files used to construct views from the IVA or internal vehicular activity, and are referenced out to the \Spaces\ directory of the relevant part mod. (Squad's internals are in \GameData\Squad\Spaces). INTERNALs have their own .cfg files with their own calls and methods that will not be discussed here. Squad provides 9 INTERNALs as part of Stock KSP:

• crewCabinInternals
• cupolaInternal
• GenericSpace1
• GenericSpace3
• landerCabinInternals
• landerCabinSmallInternal
• mk1CockpitInternal
• mk1PodCockpit
• PodCockpit

RESOURCE

In parts files, [RESOURCE] refers to a resource that is stored by a part. Each stored resource must be separately defined by a [RESOURCE] call. Any resource may be stored, including those not defined. The examples in the table below comes from a battery config.

EFFECTS

Resource Configuration Files

Resources are massively modifiable, but Stock KSP only comes with a few, and these are contained in squad/resources/ResourcesGeneric.cfg. Be extremely careful when modifying ResourcesGeneric.cfg, as it could have unintended side effects for your rockets. Resource definitions follow these conventions:

Science Definitions Configuration Files

Contracts Definitions Configuration Files

Contracts Configuration Files

Agent Configuration Files

Agent configuration files specify specific Agents that may have an impact on the performance (read science, money, and prestige) awarded to your Kerbals for completion of specific tasks. Also specifies agency relations to one another. Many of these configurations are not implemented as of [0.90]

// Agency mentalities
// * Commercial   [Increased financial stakes, both for success and failure]
// * Competitive  [competes with companies which we have a negative standing towards, auto-added if any standings set][not impl]
// * Conglomerate  []
// * Startup   []
// * Cooperative  [not impl]
// * Ecomental   [not impl]
// * Economic   []
// * Hasty    [-deadlines -expiry +rep]
// * Patient   [] 
// * Industrial   [not impl] 
// * Perfectionist  [not impl]
// * Pioneer   [Makes agency more likely to offer a contract to something that's never been done before]
// * Record    [Flags agency as a record-keeping organization, focuses on contracts about breaking existing records and doing new things]
// * Scientific   [Agency is more likely to offer science data gathering contracts][not impl]
// * Stern     [Higher Reputation Stakes for both success and failure]
// * EasyGoing   [Lower Reputation Stakes for both success and failure]
// * Kerbalminded  [not impl][Sets up conditions against losing Kerbals]
// * Moral          [not impl]
// syntax guidelines
//
// standings = agent name string, float
// mentality = MentalityClass [float]

Kerbal Configuration Files

Defines what your Kerbals can do. Contained in the Traits.cfg file.

name = Pilot

 title = Engineer 

desc = Pilots provide assistance in flying the vessel.

 EFFECT
 {
  name = VesselScienceReturn
  modifiers = 1.05, 1.1, 1.15, 1.2, 1.25
 }
 EFFECT
 {
  name = PartScienceReturn
  modifiers = 1.05, 1.1, 1.15, 1.2, 1.25
 }

Prop Configuration Files

Contained in several different files, usually labeled prop.cfg, in the /Props/ directory. Describes aspects of parts used on IVAs, included buttons, switches, dials, and screens.

PROP
{
  name = directionalKnob
  MODULE
  {
    name = internalGeneric
  }
}
proxy = 0, 0, 0,  0.0225, 0.0075, 0.0225,  0, 1, 0

PROP
{
  name = RadarAltimeter
  MODULE
  {
    name = InternalRadarAltitude
    indicatorName = indicator
    increments
    {
       inc = 0, 0
       inc = 34, 100
       inc = 70, 200
       inc = 110, 300
       inc = 145, 400
       inc = 180, 500
       inc = 215, 1000
       inc = 232, 2000
       inc = 250, 3000
    }
  }
}
proxy = 0, 0, 0,  0.06, 0.01, 0.06,  1.0, 0.5, 0

PROP
{
  name = NavBall
  MODULE
  {
    name = InternalNavBall
    navBallName = NavSphere
    iconUp = 0, 1, 0
    progradeVectorName = progradeVector
    retrogradeVectorName = retrogradeVector
    progradeWaypointName = progradeWaypoint
    retrogradeWaypointName = retrogradeWaypoint
 normalVectorName = NormalVector
 antiNormalVectorName = antiNormalVector
 radialInVectorName = RadialInVector
 radialOutVectorName = RadialOutVector
 maneuverArrowName = ManeuverArrow
 anchorName = Anchor
  }
}
proxy = 0, 0, 0,  0.075, 0.01, 0.09,  1.0, 0.5, 0

PROP
{
  name = switch
  MODULE
  {
    name = internalGeneric
  }
}
proxy = 0, 0, 0,  0.0225, 0.0075, 0.0225,  0, 1, 0

Internals Configuration Files

Strategies Configuration Files

Contained in Strategies.cfg, used to describe the variable strategies available. Each strategy opens with STRATEGY {

name = AppreciationCampaignCfg

title = Appreciation Campaign

desc = We could definitely improve our 
image by putting some effort into reminding Kerbals 
everywhere of just how great the Space Program is. 
Advertisement space isn't free, however.

department = Public Relations

icon = Squad/Strategies/Icons/AppreciationCampaign

groupTag = Basic,A

minLeastDuration = 60

maxLeastDuration = 100

minLongestDuration = 1200

maxLongestDuration = 1600

requiredReputationMin = -500

requiredReputationMax = 750

initialCostFundsMin = 8000.0

initialCostFundsMax = 160000.0

initialCostReputation = 0.0

initialCostScience = 0.0

hasFactorSlider = True

factorSliderDefault = 0.05

factorSliderSteps = 20

EFFECTS

There are currently three different EFFECT types available for use in Strategies: CurrencyOperation, ValueModifier, and CurrencyConverter. Each one has different variables and are detailed below.

name = CurrencyConverter

currency = Funds

operation = Multiply

effectDescription = to Launch Costs

minValue = 1.1

maxValue = 1.06

AffectReasons = VesselRollout

name = CurrencyConverter

valueId = VesselRecoveryFactor

minValue = 1.1

maxValue = 1.06