A python render engine targeting Vulkan/Metal/DX12.

[User Guide] [Example Gallery] [API Reference]

Installation

pip install -U pygfx glfw

To work correctly, pygfx needs some window to render to. Glfw is one lightweight option, but there are others, too. If you use a different wgpu-compatible window manager or only render offscreen you may choose to omit glfw. Examples of alternatives include: jupyter_rfb (rendering in Jupyter), PyQt, PySide, or wx.

In addition there are some platform requirements, see the wgpu docs. In essence, you need modern (enough) graphics drivers, and pip>=20.3.

Status

We're currently working towards version 1.0, which means that the API can change with each version. We expect to reach 1.0 near the end of 2023, at which point we start caring about backwards compatibility.

This means that until then, you should probably pin the pygfx version that you're using, and check the release notes when you update.

Usage Example

Note The example below is designed against the main branch, and may not work on the latest release from pypi, while we're in beta.

Note A walkthrough of this example can be found in the guide.

import pygfx as gfx
import pylinalg as la

cube = gfx.Mesh(
    gfx.box_geometry(200, 200, 200),
    gfx.MeshPhongMaterial(color="#336699"),
)

rot = la.quat_from_euler((0, 0.01), order="XY")

def animate():
    cube.local.rotation = la.quat_mul(rot, cube.local.rotation)

if __name__ == "__main__":
    gfx.show(cube, before_render=animate)

Feature Highlights

Some of pygfx's key features are:

• SDF based text rendering (example)
• order-independent transparency (OIT) (example)
• lights, shadows, and physically based rendering (PBR) (example)
• event system with built-in picking (example)
• texture and color mapping supporting 1D, 2D and 3D data (example)

And many more! Check out our feature demos in the docs.

About pygfx

Pygfx is a ThreeJS inspired graphics library that uses WGPU (the successor of OpenGL) to provide GPU acceleration to rendering workloads. It is mature enough to serve as a general-purpose rendering engine (Yes, you can write a game with it.) while being geared towards scientific and medical visualization. Thanks to its low level of abstraction it is flexible and can be adapted to various use-cases. In other words, pygfx emphasizes on hackability and correctness while maintaining the level of performance you would expect from a GPU accelerated library.

License

Pygfx is licensed under the BSD 2-Clause "Simplified" License. This means:

• :white_check_mark: It is free (and open source) forever. :cupid:
• :white_check_mark: You can use it commercially.
• :white_check_mark: You can distribute it and freely make changes.
• :x: You can not hold us accountable for the results of using pygfx.

Contributing

We use a pull request (PR) based workflow similar to many other open-source libraries in the python ecosystem. You can read more about this workflow here; if you have previously contributed to open-source, a lot of this will look familiar already.

Development Install

To get a working dev install of pygfx you can use the following steps:

# Click the Fork button on GitHub and navigate to your fork
git clone <address_of_your_fork>
cd pygfx
# if you use a venv, create and activate it
pip install -e .[dev,docs,examples]
pytest

Testing

The test suite is divided into two parts; unit tests for the core, and unit tests for the examples.

• pytest -v tests runs the core unit tests.
• pytest -v examples tests the examples.