https://github.com/translunar/pyquat

Fast unit quaternion code for Python written in C
https://github.com/translunar/pyquat

physics physics-simulation python quaternions unit-quaternions

Last synced: 2 months ago
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Fast unit quaternion code for Python written in C

• Host: GitHub
• URL: https://github.com/translunar/pyquat
• Owner: translunar
• License: bsd-3-clause
• Created: 2016-01-11T19:39:56.000Z (about 9 years ago)
• Default Branch: main
• Last Pushed: 2023-10-19T23:21:00.000Z (over 1 year ago)
• Last Synced: 2024-11-13T02:10:42.813Z (3 months ago)
• Topics: physics, physics-simulation, python, quaternions, unit-quaternions
• Language: Python
• Size: 157 KB
• Stars: 11
• Watchers: 0
• Forks: 2
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
# pyquat

pyquat is a Python C extension providing quaternions and functions relating to simulation of attitudes and rotations.

This might be useful for video games, spacecraft simulators, and sensors such as LIDARs and star trackers which provide

attitude information. You can use them in place of rotation matrices. Unit quaternions represent attitude as half of the

surface of a unit sphere in four dimensions (SO4).

[![Build Status](https://travis-ci.org/translunar/pyquat.svg?branch=master)](https://travis-ci.org/translunar/pyquat)

[![image](http://img.shields.io/pypi/v/pyquat.svg)](https://pypi.python.org/pypi/pyquat/)

## Developers

Note that since Travis discontinued free CI for open source projects, our CI pipeline

has stopped working. The correct sequence to run before initiating a pull request is:

    pip3 install -r requirements.txt

    python3 setup.py build_ext --inplace

    python3 setup.py test

    cd pyquat/

    mypy .  --config-file=mypy.ini --exclude=build --explicit-package-bases --strict

## Installation

    python3 setup.py build

    python3 setup.py install

## Usage

    from pyquat import Quat

    import pyquat

    q = pyquat.identity()

    q4 = Quat(0.73029674334022143, 0.54772255750516607, 0.36514837167011072, 0.18257418583505536)

    q2 = q * q4.conjugated()

    q2.normalize()

    q2.conjugate()

    transform = q2.to_matrix()

    vec = q2.to_rotation_vector()

## License

Copyright 2016--2023 Juno Woods, Ph.D., and Translunar LLC.

See LICENSE.txt.