Assets

Beyond color changes, FM Skin Builder lets you replace visual assets - icons, backgrounds, and fonts. This section covers how to work with these asset types.

Asset Types

Quick Start

Setting Up Asset Folders

Create the folder structure:

my-skin/
├── config.json
├── styles/
│   ├── base.uss
│   └── mapping.json
└── graphics/
    ├── icons/
    │   ├── my-icon.png
    │   └── mapping.json
    └── backgrounds/
        ├── my-background.jpg
        └── mapping.json

Adding to Config

Tell FM Skin Builder to process your assets:

{
  "schema_version": 1,
  "name": "My Skin",
  "includes": [
    "graphics/icons",
    "graphics/backgrounds"
  ]
}

Creating Mappings

Each asset folder needs a mapping.json:

{
  "my-icon.png": "original_icon_name",
  "background.png": "game-background"
}

Asset Discovery

Finding what assets you can replace:

1. Asset Catalogue - Browse FM’s sprites and textures
2. Bundle Viewer in App - Browse FM’s bundles
3. Trial and Error - Use wildcards to discover names