Muncher

CLI tool to generate sprite sheets for games

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✨ Features

• Reads .piskel and .png files and turns them into sprite sheets using Texture Packer

• Can add a horizontally flipped copy to the output

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How to use

Example usage with npx:

npx muncher --input sprites/ --output output/spritesheet

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If your project includes a package.json, then the preferred way is to include muncher as a dev dependency:

npm i --save-dev muncher

or

yarn add --dev muncher

You can then add a script to your package.json scripts section:

"munch": "muncher --input sprites/ --output output/spritesheet"

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CLI flags

input - The source folder. Contains .png and .piskel files that you want to turn into a sprite sheet.

output - The output filename. A .json and a .png sprite sheet file will be created.

flip - Every file name that ends with either left or right will also generate a horizontally flipped copy. (Optional)

config - Path to config file. (Optional)

Texture packer options

All options that you can pass to the texturepacker CLI you can also pass to muncher. For example:

muncher --input sprites --output output/spritesheet --extrude 5 --multipack

Available options

Config file

Instead of passing options as flags on the command line, you can specify them in a config file:

npx muncher --config muncher.json

The format has to be .json

muncher.json

{
  "input": "sprites",
  "output": "output/spritesheet",
  "flip": true,
  "extrude": 5
}

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Example output

png

example.png => example.png

With flip enabled:

player/walk-right.png => player/walk-right.png and player/walk-left.png

piskel

Since piskel files can contain multiple images (frames), the texture name will include the frame index as a suffix:

example.piskel => example-1.png

With flip enabled:

example-right.piskel => example-right-1.png and example-left-1.png

Example

input folder structure

sprites/
├── multiple-layers.piskel
├── green/
│   └── green.png
├── muncher/
│   ├── piskel/
│   │   └── muncher-right.piskel
│   └── png/
│       └── muncher-right.png
└── square/
    ├── square1.png
    └── square2.png

muncher --input sprites/ --output output/spritesheet --flip

output texture names

multiple.layers.png
green/green.png
muncher/piskel/muncher-right-0.png
muncher/piskel/muncher-left-0.png
muncher/png/muncher-right.png
muncher/png/muncher-left.png
square/square1.png
square/square2.png

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Requirements

Texture Packer CLI

• Download Texture Packer.

• Install the command line tool from the application UI.

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imagemagick

MacOS

You can install imagemagick with homebrew:

brew install imagemagick

Linux

https://medium.com/@sanjaywrites/install-latest-version-of-imagemagick-in-ubuntu-16-04-c406ddea1973

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Node.js

nodejs.org - Version 11 or higher

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Recipes

Multiple output sprite sheets

Try to only use one output spritesheet for as long as possible. This is better for performance reasons. If your spritesheet becomes too big, try to separate it by layer in your game. For example, 'background' and 'foreground'. In that case, you can add multiple muncher commands to a script and execute that one.

Example:

./munch.sh

muncher --input example/sprites/background/ --output example/output/background
muncher --input example/sprites/foreground/ --output example/output/foreground

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Develop

Workflow

1. Make changes

2. yarn build-test - Builds, packs, installs to example folder and executes muncher there.

3. If everything works: push master or make a PR