pybosl2 0.6.3

Python ports of the BOSL2 OpenSCAD library for use with PythonSCAD

pybosl2

Python ports of the BOSL2 OpenSCAD library, for use with PythonSCAD. The package is imported as bosl2, with one module per wrapped/ported .scad file so each Python module can be read side by side with its OpenSCAD source.

Most modules (constants, math, vectors, paths, shapes2d, …) are standalone pure-Python ports that work in plain CPython. The modules that build native geometry (shapes3d, masking, and the .polygon()/.polyhedron() boundaries) import the pythonscad/openscad native modules at load time.

Reference

• Docs
• Specs of the various parts

Installation

pip install pybosl2

This pulls in numpy. To build native geometry you also need PythonSCAD:

pip install pythonscad

Usage

Import by submodule (the square/circle/cube/text names intentionally shadow the plain OpenSCAD builtins with BOSL2's anchor/spin/orient-aware versions, so the package is deliberately not wildcard-re-exported):

import bosl2.shapes3d as s3
import bosl2.shapes2d as s2

part = s3.cuboid([20, 20, 10]).up(5)

Development & tests

The test-suite runs against a real, pip-installed pythonscad in a virtualenv:

python -m venv .venv          # create from outside the repo dir, or the local
                              # bosl2/math.py etc. can shadow stdlib modules
source .venv/bin/activate
pip install -e '.[test]'      # installs pybosl2 + pytest + numpy + pythonscad
pytest

The [test] extra installs the pythonscad wheel, which provides the real pythonscad/openscad native modules the geometry code imports.

A small number of tests exercise the full PythonSCAD app rather than the pip wheel:

• STL-render tests (tests/test_stl_render.py) drive the real PythonSCAD binary in a subprocess to export and measure meshes. They skip unless a binary is found (set PYTHONSCAD_BIN, or install the app to /Applications).
• App-only native ops (e.g. roof()) skip when the pip wheel does not provide them.

pysolidfive (bundled separate package)

The repo also vendors pysolidfive — a small, self-contained libfive / signed-distance-function shape library for PythonSCAD. It is a separate piece: it does not depend on bosl2, ships in the same wheel as its own top-level pysolidfive package, and keeps its own tests, docs, and pyproject.toml.

Its test-suite runs against the numeric mock_libfive stand-in bundled in pysolidfive/tests, so it needs only numpy (no pythonscad wheel). It uses unittest rather than pytest — the package eagerly import libfives at load, which is incompatible with pytest's package-based collection:

cd pysolidfive/tests
python -m unittest discover -s . -t .

Documentation

The API docs are built with Sphinx (autodoc + napoleon) straight from the module docstrings:

pip install -e '.[docs]'
make -C docs html      # renders into wiki/

On push to main, the docs GitHub Actions workflow builds and publishes them to GitHub Pages (enable Pages with Settings → Pages → Source: GitHub Actions). Examples in the docs embed interactive 3-D STL viewers; the renders are cached under docs/_generated/ and docs/_extra/_stl/ — commit those caches so the images appear on Pages, since CI has no PythonSCAD binary to render them.

License

BSD 2-Clause License — see LICENSE.