HPL3/SOMA/Modding/Creating a Mod

This article describes in detail how to create, setup and structure your mod.

Tip: The game comes with two built-in example mods: Minimal AddOn Mod and MinimalCustomMapMod. You can copy them or use them as reference for creating your own mod.

Mod Types

SOMA has two mod types: Stand-Alone mod and Add-On. Technically speaking, the only difference between them is that an Add-On can be run along with a Stand-Alone mod. However, a mod type shall be picked according to the nature of the mod you make, for contentions sake.

Stand-Alone Mod

A Stand-Alone mod describes a mod of extensive game modification: Custom assets, Custom scripts and even overrides of existing game scripts. If your mod is going to have any maps in it, it's probably a Stand-Alone mod.

Add-On Mod

A Add-On mod describes a mod with of specific or limited game modification: Minor config, graphical or script changes that tweaks an existing feature of the game. If your mod touches on small feature, it's probably an Add-On mod. For example: An Add-On that adds a Russian translation to the game.

Mod Structure

A typical mod structure (folders and files) look like this:

modFolder/
├── config/
│   ├── lang/
│   │   ├── english.lang
│   ├── main_init.cfg
├── maps/
├── entry.hpc
├── resources.cfg

The mod structure may change and have more or less files, depends on your mod type, but it's important to have entry.hpc and resources.cfg for every mod.

Mod Entry File

When creating a mod, be it a simple add-on or a fully fledged total conversion, an entry file is needed so that the mod can be listed by the ModLauncher application or simply be started by the game. This means that an XML file with name entry.hpc needs to be created in the root directory of the mod, and its contents will depend on what kind of mod you are creating.

It is recommended to use the SOMA Mod Manager to create and configure your mod. However, it is possible create and add the entry file manually.

Common Attributes

Any valid entry.hpc file will have at least the following attributes:

Version	The version for the mod, since the mod might get updated in the future.
Type	The type for the content the mod is offering. Possible values are "AddOn" or "StandAlone".
Title	This sets the title for the mod. It should not be longer than 128 characters, especially if the mod is to be uploaded to the Steam Workshop.
Author	The creator(s) of the mod. This will be shown below the title on the info column in the ModLauncher application.
Description	The description of the mod. Should not exceed 8000 characters for the same reason as the title.
LauncherPic	The file to be used as a thumbnail picture for the ModLauncher application.
InitCfg	The relative path to the file which information when initializing the mod. The default value is "config/main_init.cfg" and usually shouldn't be changed.

Special Attributes

There are special attributes when can be added to a mod entry file in order to enable optional functionalities:

UID	A string in the form "provider_name.mod_name". This is used so other mods can reference your mod as a Mod Dependency
Dependencies	A list of UIDs separated by commas. The resources in these mods will be available to the game when the current mod is running.

Setting up the Entry File

Tip: It is recommended to copy one of the sample mods provided with the game and edit the files, instead of doing this manually. This way, you won't miss anything by mistake.

There are two ways to set up the entry file. Either:

• Use the SOMA Mod Manager to easily create or edit the file.
• Set up the file manually:

1. Create a file named entry.hpc in your mod's root folder.
2. Paste the following content into the file and save:

   <?xml version="1.0" encoding="UTF-8"?>
   <Content Version="1.0"
   	Type="StandAlone"
   	Title="Your mod name here"
   	Author="Your name here"
   	Description="Mod description here"
   	
   	LauncherPic="LauncherPic.png"
   	InitCfg="config/main_init.cfg"
   />
   

Change Type to AddOn if necessary.

Mod Configuration Files

In addition to the mod entry file, the mod needs to be correctly configured in order to load resources such as maps, script, sounds, sounds, etc (As seen in the Mod Structure diagram).

Read the following articles in order to understand how to set up and configure them:

• Resources Configuration
• Launch Configuration
• Language Configuration

It is recommended to copy the files from the mods provided with the game and modify them, instead of creating them on your own.

Running the Mod

A mod viewed from the ModLauncher application.

There are two different ways to run a mod:

• ModLauncher Application: The Mod Launcher is an application which can launch mods, along with addons. Running the mod via the application does not enable any dev features, and therefore should be mostly used only when testing the final version of the mod, before releasing it.

Main article: SOMA Mod Launcher

• Command Line: to run a mod directly, you only need to run the game executable passing the "-mod" option followed by the full path to the mod's "entry.hpc" file as arguments. Using this method, the mod can be placed anywhere as long as the path to the "entry.hpc" file passed is correct. For the previous example, given the full path for the mod "my_mod" is "C:\my_mod\", the command line for running it should read like this:

Soma.exe -mod C:\my_mod\entry.hpc