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Outer Wilds New Horizons

This is the official documentation for New Horizons{ target="_blank" }

Getting Started

The Config Template{ target="_blank" } is available if you want to release your own planet mod using configs. You can learn how the configs work by picking apart the Real Solar System{ target="_blank" } mod or the New Horizons Examples{ target="_blank" } mod.

Planets are created using a JSON file format structure, and placed in a folder called planets (or in any subdirectory of it) in the location where New Horizons is installed (by default this folder doesn't exist, you have to create it within the xen.NewHorizons directory).

To locate this directory, click the "⋮" symbol next to "New Horizons" in the Outer Wilds Mod Manager and then click " show in explorer" in the pop-up.



Now that you have created your planets folder, this is where you will put your planet config files. A config file will look something like this:

Now that you have created your planets folder, this is where you will put your planet config files. A config file will look something like this:

{
  "name": "Wetrock",
  "$schema": "https://raw.githubusercontent.com/xen-42/outer-wilds-new-horizons/master/NewHorizons/schema.json",
  "starSystem": "SolarSystem",
  "Base": {
    "groundSize": 100,
    "surfaceSize": 101,
    "surfaceGravity": 12,
    "hasMapMarker": true
  },
  "Orbit": {
    "semiMajorAxis": 1300,
    "inclination": 0,
    "primaryBody": "TIMBER_HEARTH",
    "isMoon": true,
    "isTidallyLocked": true,
    "longitudeOfAscendingNode": 0,
    "eccentricity": 0,
    "argumentOfPeriapsis": 0
  },
  "Atmosphere": {
    "size": 150,
    "fogTint": {
      "r": 200,
      "g": 255,
      "b": 255,
      "a": 255
    },
    "fogSize": 150,
    "fogDensity": 0.2,
    "hasRain": true
  },
  "Props": {
    "scatter": [
      {
        "path": "DreamWorld_Body/Sector_DreamWorld/Sector_DreamZone_1/Props_DreamZone_1/OtherComponentsGroup/Trees_Z1/DreamHouseIsland/Tree_DW_M_Var",
        "count": 12
      }
    ]
  }
}

The first field you should have in any config file is the name. This should be unique in the solar system. If it isn't, the mod will instead try to modify the planet that already has that name.

After name is starSystem. You can use this to place the planet in a different system accessible using a black-hole ( see the [Singularity]({{ 'body'|route }}#Singularity) module). To ensure compatibility with other mods this name should be unique. After setting a value for this, the changes in the config will only affect that body in that star system. By default, it is " SolarSystem", which is the scene from the stock game.

Including the "$schema" line is optional, but will allow your text editor to highlight errors and auto-suggest words in your config. I recommend using VSCode as a text editor, but anything that supports Json files will work. Something as basic as notepad will work but will not highlight any of your errors.

The config file is then split into modules, each one with its own fields that define how that part of the planet will be generated. In the example above I've used the Base, Orbit, Atmosphere, and Props modules. A config file must have a Base and Orbit module, the rest are optional.

Each { must match up with a closing } to denote its section. If you don't know how JSONs work then check Wikipedia.

Modules look like this:

{
  "Star": {
    "size": 3000,
    "tint": {
      "r": 201,
      "g": 87,
      "b": 55,
      "a": 255
    }
  }
}

In this example the Star module has a size field and a tint field. Since the colour is a complex object it needs another set of { and } around it, and then it has its own fields inside it : r, g, b, and a. Don't forget to put commas after each field.

Most fields are either true/false, a decimal number, and integer number, or a string (word with quotation marks around it).

Check out the rest of the site for how to format planet, star system, dialogue, ship log, and translation files!

Helpful Resources

The texturemap/heightmap feature was inspired by the KSP mod Kopernicus. A lot of the same techniques that apply to planet creation there apply to New Horizons. If you need help with planetary texturing, check out The KSP texturing guide{ target="_blank" }.

Photopea{ target="_blank" } is a free browser-based photo editor which has useful features like rectangular-to-polar coordinate transformation, useful for fixing abnormalities at the poles of your planets.