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https://github.com/kcoley/gltf2usd
command-line utility for converting glTF 2.0 models to USD
https://github.com/kcoley/gltf2usd
arkit2 arquicklook gltf usd usdz
Last synced: about 1 month ago
JSON representation
command-line utility for converting glTF 2.0 models to USD
- Host: GitHub
- URL: https://github.com/kcoley/gltf2usd
- Owner: kcoley
- License: mit
- Created: 2018-08-12T05:38:45.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2023-10-03T22:41:49.000Z (9 months ago)
- Last Synced: 2024-02-07T14:55:55.201Z (5 months ago)
- Topics: arkit2, arquicklook, gltf, usd, usdz
- Language: Python
- Size: 1.32 MB
- Stars: 253
- Watchers: 23
- Forks: 39
- Open Issues: 28
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Lists
- usd-resources - gltf2usd
- awesome-openusd - gltf2usd
README
# gltf2usd
This tool is a command-line Python script which converts glTF 2.0 models to USD, with the goal being simple pipeline conversion from glTF to usd, usda, usdc, or usdz.
The tool is a **proof-of-concept**, to determine format conversion details, which could be useful for an actual C++ USD plugin. It has been developed and tested on both Windows 10 and Mac OS 10.14 Mojave Beta, using USD v18.09 and v18.11, and is built against the USD Python API.
This tool currently only works on glTF 2.0 files, based on the core glTF 2.0 specification (no extensions except `PbrSpecularGlossiness` and `KHR_texture_transform`).
## Supported Features
- glTF nodes are mapped to USD `Xform`
- glTF `PbrMetallicRoughnessMaterial` is mapped to `USDPreviewSurface`
- glTF [KHR_materials_pbrSpecularGlossiness](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_pbrSpecularGlossiness) extension
- glTF [KHR_texture_transform](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_transform) extension (new textures are generated at the expense of a longer export time)
- glTF Skeletal animation is mapped to `UsdSkel`
- glTF node animations are supported
- Currently supports `.gltf` conversion to `.usd`, `.usda`, `.usdc`, and `.usdz`
## Currently not implemented:
- `.glb` files
- glTF extensions (except `KHR_materials_pbrSpecularGlossiness` and `KHR_texture_transform`)
- Primitive modes (other than triangles)
## Note:
- The root node of the generated USD file is, by default, scaled by 100 to convert from glTF's meters to USD's centimeters. This scale is purely to be able to see the glTF models when using ARKit, or otherwise, they are too small.
- There are several edge cases that have not been fully tested yet
## Dependencies:
- You will need to initially have [USD v18.09 or v18.11](https://github.com/PixarAnimationStudios/USD) installed on your system
and have the Python modules built
- Linux users will need to build the tools themselves, or use [AnimalLogic's USD Docker Container](https://github.com/AnimalLogic/docker-usd) (recommended for non-CentOS users)
- macOS users can use Apple's [Prebuilt USD Toolkit](https://developer.apple.com/go/?id=python-usd-library). Make sure you add the USD dir to your `PYTHONPATH` (an easy way to do this is to run the `path_to_usdpython/USD.command` shell command included with the prebuilt USD Toolkit).
### Python dependencies
You can install the following python dependencies using `pip install -r requirements.txt`:
- Pillow (Python module for image manipulation)
- enum34 (Python module for enums in Python 2.7)
## Help Menu:
```Shell
python gltf2usd.py -h
usage: gltf2usd.py [-h] --gltf GLTF_FILE [--fps FPS] --output USD_FILE
[--scale] [--verbose] [--arkit]
Convert glTF to USD
optional arguments:
-h, --help show this help message and exit
--gltf GLTF_FILE, -g GLTF_FILE
glTF file (in .gltf format)
--fps FPS The frames per second for the animations (defaults to 24 fps)
--output USD_FILE, -o USD_FILE
destination to store generated .usda file
--scale SCALE, -s Scale the resulting USDA model
--verbose, -v Enable verbose mode
--arkit Check USD with ARKit compatibility before making USDZ
file
--use-euler-rotation sets euler rotations for node animations instead of
quaternion rotations
--optimize-textures Specifies if image file size should be optimized and
reduced at the expense of longer export time
--generate_texture_transform_texture
Enables texture transform texture generation
--no-generate_texture_transform_texture
Disables texture transform texture generation
```
## Sample usage:
Create a .usda file
```Shell
python gltf2usd.py -g ../path_to_read_glTF_file/file.gltf -o path_to_write_usd_file/file.usda
```
Create a .usdz file
```Shell
python gltf2usd.py -g ../path_to_read_glTF_file/file.gltf -o path_to_write_usd_file/file.usdz
```