# CLAUDE.md

OrcaSlicer — open-source C++17 3D slicer. wxWidgets GUI, CMake build system.

## Build Commands

```bash
# macOS
cmake --build build/arm64 --config RelWithDebInfo --target all --

# Linux
cmake --build build --config RelWithDebInfo --target all --

# Windows (replace %build_type% with Debug/Release/RelWithDebInfo)
cmake --build . --config %build_type% --target ALL_BUILD -- -m
```

## Testing

Catch2 framework. Tests in `tests/` directory.

```bash
cd build && ctest --output-on-failure           # all tests
ctest --test-dir ./tests/libslic3r              # individual suite
ctest --test-dir ./tests/fff_print
```

## Code Style

- C++17, selective C++20. PascalCase classes, snake_case functions/variables
- `#pragma once` for headers. Smart pointers and RAII preferred
- Parallelization via TBB — be mindful of shared state

## Key Entry Points

- App startup: `src/OrcaSlicer.cpp`
- Slicing pipeline: `src/libslic3r/Print.cpp`
- All print/printer/material settings: `src/libslic3r/PrintConfig.cpp`
- GUI: `src/slic3r/GUI/`
- Core algorithms: `src/libslic3r/` (GCode/, Fill/, Support/, Geometry/, Format/, Arachne/)
- Printer profiles: `resources/profiles/[manufacturer].json`

## Critical Constraints

- **Backward compatibility required** for .3mf project files and printer profiles
- **Cross-platform** — all changes must work on Windows, macOS, and Linux
- Profile/format changes need version migration handling
- Dependencies built separately in `deps/build/`, then linked to main app