A Unity asset extractor for Python based on AssetStudio.
Python 3.6.0 or higher is required
pip install UnityPy
or download/clone the git and use
python setup.py install
The following is a simple example.
import os
from UnityPy import AssetsManager
def unpack_all_assets(source_folder : str, destination_folder : str):
# iterate over all files in source folder
for root, dirs, files in os.walk(source_folder):
for file_name in files:
# generate file_path
file_path = os.path.join(root, file_name)
# load that file via AssetsManager
am = AssetsManager(file_path)
# iterate over all assets and named objects
for asset in am.assets.values():
for obj in asset.objects.values():
# only process specific object types
if obj.type in ["Texture2D", "Sprite"]:
# parse the object data
data = obj.read()
# create destination path
dest = os.path.join(destination_folder, data.name)
# make sure that the extension is correct
# you probably only want to do so with images/textures
dest, ext = os.path.splitext(dest)
dest = dest + ".png"
img = data.image
img.save(dest)
You probably have to read Important Classes and Important Object Types to understand how it works.
People who have slightly advanced python skills should take a look at AssetBatchConverter.py for a more advanced example.
AssetsManager loads and parses the files that are given to it. It can be initialized via:
- a file path - apk files can be loaded as well
- a folder path - loads all files in that folder (bad idea for folders with a lot of files)
- a stream - e.g. io.BytesIO, filestream,...
- a bytes object - will be loaded into a stream
UnityPy can detect itself if the file is a WebFile, BundleFile, Asset or APK itself.
The unpacked assets will be loaded into .assets
, which is a dict consisting of asset-name : asset
.
from UnityPy import AssetsManager
am = AssetsManager(src)
for asset_name, asset in am.assets.items():
pass
Assets are a container that contains multiple objects. One of these objects can be an AssetBundle, which contains a file path for some of the objects in the same asset.
All objects can be found in the .objects
dict - {ID : object}
.
The objects which have a file path can be found in the .container
dict - {path : object}
.
Objects contain the actual files which, e.g. textures, text files, meshes, settings, ...
To acquire the actual data of an object it has to be read first, this happens via the .read()
function. This isn't done automatically to save time because only a small part of the objects are of interest.
All object types can be found in UnityPy/classes.
.name
.image
converts the texture into aPIL.Image
.m_Width
- texture width (int).m_Height
- texture height (int)
Sprites are part of a texture and can have a separate alpha-image as well. Unlike most other extractors (including AssetStudio) UnityPy merges those two images by itself.
.name
.image
- converts the merged texture part into aPIL.Image
.m_Width
- sprite width (int).m_Height
- sprite height (int)
TextAssets are usually normal text files.
.name
.script
- binary data (bytes).text
- script decoded via UTF8 (str)
Some games save binary data as TextFile, so it's usually better to use .script
.
MonoBehaviour assets are usually binary data that has to be decoded. e.g. via msgpack, protobuf
.name
.script
- binary data (bytes)
.samples
-{sample-name : sample-data}
dict
- a documentation
- the ability to edit assets (like in UABE)
- support for more object types
- code optimization
- speed-ups via C-extensions
- multiprocessing
I'm an active data-miner and noticed that unitypack has problems with new unity assets. The problem in unitypack isn't that easy to fix and the undocumented code is a bit hard to understand. That's why I tried other tools like UABE and AssetStudio. Sadly none of these tools can be used like unitypack. That's why I started this project.