openscad_cpp_evaluator
A C++20 port of openscad_evaluator (Python): an AST-walking
geometry engine that takes a parsed OpenSCAD AST and produces Manifold
CSG geometry, ready to export to STL/OBJ/OFF/3MF or hand off to a renderer.
Built on:
openscad_cpp_parser(git submodule) for lexing/parsing/AST/scope resolution.- Manifold v3.5.2 for the actual CSG boolean/mesh engine.
- Boost.Polygon for
roof()'s Voronoi-diagram construction. nothings/stb(header-only) forsurface()'s image loader and the built-in font provider's TrueType parsing/rasterization.
All fetched automatically via CMake FetchContent — no manual dependency installation beyond the
toolchain below.
Status
All planned phases (0–9) are complete: the full primitive/transform/boolean/modifier/control-flow
language surface, every builtin function, STL/OBJ/OFF/3MF import and export, hull()/minkowski()/
linear_extrude()/rotate_extrude()/roof()/offset()/surface()/DXF & SVG import/text(), an
opt-in content-hash geometry cache, per-call-site profiling, and a gdb-style --debug REPL. See
CLAUDE.md for the full phase-by-phase history and architecture notes.
Build
Requires:
- CMake ≥ 3.24
- A C++20 compiler (Clang, GCC, or MSVC — all three are covered by CI)
- Bison ≥ 3.8 and Flex
- macOS:
brew install bison flex(the system bison is too old; CMake auto-detects Homebrew's) - Linux:
sudo apt-get install bison flex - Windows: MSYS2's
bison/flex(pacman -S bison flex) — GitHub'swindows-latestrunner ships MSYS2 pre-installed atC:\msys64; CMake auto-detects it there too
- macOS:
GoogleTest and every other C++ dependency are fetched automatically.
git clone --recurse-submodules <this-repo>
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build -j
(Omitting -DCMAKE_BUILD_TYPE=Release builds unoptimized — pass it explicitly for anything
performance-sensitive.)
On Windows, CMake defaults to the multi-config Visual Studio generator, which ignores
CMAKE_BUILD_TYPE; pass --config Release to cmake --build (and -C Release to ctest)
instead.
Test
ctest --test-dir build --output-on-failure
Run a single binary or filter:
build/tests/oscad_eval_tests
build/tests/oscad_eval_tests --gtest_filter='FormatNumber.*'
The suite runs twice in CI — once with the bytecode VM on (the default) and once with it off
(OSCAD_BYTECODE_VM=0) — so a regression in either the compiled or interpreted expression-eval
path is caught.
CLI
build/tools/cli/openscad-cpp-evaluator <input.scad> -o <output.{stl,obj,off,3mf}> [--format stl|obj|off|3mf] [--debug]
The output format is inferred from -o's extension, or set explicitly with --format.
--debug drops into a gdb-style REPL (break/run/continue/step/next/finish/print/
backtrace/set/list/quit/help) before and during evaluation.
build/tools/cli/openscad-cpp-evaluator model.scad -o model.stl
Architecture
See CLAUDE.md for the full per-file architecture map, the Python-reference cross-check history,
and the rationale behind every non-obvious design choice (the two-pass resolve/generate CSG
pipeline, the FontProvider injection seam, the closure-detection rule, etc.).
CI
GitHub Actions builds and tests on Linux, macOS, and Windows on every push/PR (.github/workflows/ci.yml).
1 maintainer
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