Felix RiestraandClaude Sonnet 5
44deee2ac9
Ports the fixes from fix/osnap-circle-arc-ellipse-intersection (and this session's audit follow-up) onto this branch. All are independent correctness/reliability fixes, unrelated to the parametric-constraint- system work also in progress here. 1. OSNAP Intersection snap used a tessellated approximation instead of exact geometry (GitHub discussion #1052): a circle/arc always tessellates at a fixed 48 segments in the resident wire set regardless of radius or zoom, so every circle/arc intersection snap was off by construction. Added exact_circle_intersections, a closed-form, frame-independent circle/arc-vs-circle/arc solver, wired into both Intersection-snap code paths ahead of the tessellated sweep. This branch's TangentGeom predates the PlanarEllipse variant added upstream, so the ellipse/line generalization from the upstream fix isn't ported here — this covers the literal reported bug (a circle-circle case) using only variants this branch already has. 2. Unbounded MINSERT allocation: array_offsets() reserved one Vec element per array instance with row/column counts parsed as unchecked u16s — a corrupt 65535x65535 pair requests ~96 GiB. Fixed with a documented instance budget (20,000), enforced at both the load-time corrupt-entity filter and a render-graph failsafe. 3. MINSERT spacing was scaled by the block's own scale: insert_instance_transform composed the offset translation before the instance transform, so x/y block scale multiplied the row/ column spacing too. Fixed by orienting the offset with rotation + OCS only, then translating the already-scaled instance transform. 4. Automation "open" skipped the finalization (block-origin normalization, raster-path resolution, source_path) and corrupt- entity purge a UI open always runs. Added io::load_bytes_finalized(path, bytes), used by automation's "open" handler, which now also reports the purge count. 5. Material maps were uploaded without checking device.limits().max_texture_dimension_2d, unlike raster-image rendering (which already tiles to that limit). A mesh material is sampled by UV, so it can't use the same tiling trick — instead, upload_rgba_texture now downscales an oversized image before upload, falling back to the 1x1 material color if malformed. 6. Sketch-constraint persistence/undo, audit-found while reviewing this branch's own constraint system: - Clearing every constraint in a scope after a prior non-empty save left the stale XRecord in place, resurrecting the deleted constraints on the next load. materialize_sketch_constraints_for_ save now actively removes the XRecord when a scope goes back to empty. - ERASE removing an entity took its constraints with it (design doc's deletion policy), but sketch_constraints lives on Scene, outside document/document.objects, so nothing captured that mutation for undo — the erased geometry came back on undo, but its constraints didn't. refresh_sketch_constraints's deletion pass now records the touched scope's before-image into the same UndoRecording the entity removal rides in, threaded through a new sketch_constraints channel on DeltaSnapshot, so one undo restores both together. HistorySnapshot::Delta is now boxed (clippy flagged the resulting size skew across undo/redo stack variants). 31 new/adapted tests across all six fixes. Full workspace suite passes except the one pre-existing, unrelated font-test failure also present on main. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Open CAD Studio
Open-source 2D drafting and 3D modeling for desktop and web, built with Rust.
Launch the web app · Download the desktop app · Join the discussion
Overview
Open CAD Studio is a cross-platform application for technical drawing, layout work, and solid modeling. It reads and writes DWG and DXF drawings natively, with a shared editing core across the desktop and browser versions.
The project is under active development. Keep backups of important production drawings and report reproducible problems through GitHub Issues.
Highlights
- Native drawing workflow — open, edit, recover, and save DWG and DXF files without a conversion service.
- Precise 2D drafting — lines, polylines, curves, splines, hatches, object snaps, tracking, layers, blocks, and external references.
- Documentation tools — text, dimensions, leaders, tolerances, tables, model space, paper space, viewports, and plot styles.
- Kernel-backed 3D modeling — solid primitives, extrusion, revolution, sweep, loft, Boolean operations, and ACIS entity tessellation.
- GPU rendering — accelerated 2D and 3D viewports through
wgpu, with orthographic and perspective cameras. - Extensible workflows — native plugins, command scripts, headless conversion, and a line-based JSON automation API.
File workflows
| Format or workflow | Support |
|---|---|
| DWG | Read and write; versioned save targets from R14 through 2018 |
| DXF | Read and write; versioned save targets from R14 through 2018 |
| BAK / SV$ | Open drawing backups and autosave files |
| OBJ | Import polygon meshes |
| LandXML | Import CgPoint survey points |
| STL | Export 3D mesh data |
| STEP AP203 | Export 3D mesh data |
| Plot layouts and selected geometry on desktop | |
| CSV | Extract entity property data |
| CTB / STB | Load and edit plot style tables |
Desktop or web
Use the web app for immediate access with no installation. Drawings are selected through the browser and saved as local downloads.
Use the desktop application for native file associations, file-manager thumbnails, system printing, PDF output, external plugins, command scripts, and headless automation. Release builds are available for Windows, Linux, and Apple Silicon macOS.
Install
Download all current packages from the latest release.
Windows
Choose one of these signed x86-64 packages:
OpenCADStudio-*-windows-x86_64-installer.msi— recommended installer with Start Menu shortcuts, DWG/DXF file associations, and drawing thumbnails.OpenCADStudio-*-windows-x86_64-portable.exe— standalone application; no installation required.
Linux
Download the x86-64 AppImage, make it executable, and run it:
chmod +x OpenCADStudio-*-linux-x86_64.AppImage
./OpenCADStudio-*-linux-x86_64.AppImage
macOS
The published macOS package supports Apple Silicon:
- Download
OpenCADStudio-*-macos-arm64.dmg. - Open the image and drag
OpenCADStudio.appinto Applications. - If Gatekeeper blocks the first launch, approve the app from System Settings → Privacy & Security.
The application is ad-hoc signed but is not currently notarized by Apple.
Languages
Open CAD Studio can follow the system language or use any of these 21 interface languages:
Arabic · Brazilian Portuguese · Bulgarian · Czech · Dutch · English · Finnish · French · German · Greek · Hindi · Hungarian · Italian · Japanese · Korean · Polish · Russian · Simplified Chinese · Spanish · Traditional Chinese · Turkish
Change the language from the application settings. The browser version also uses the browser's preferred locale when System is selected.
Build from source
Desktop
Requirements:
- Git
- Current stable Rust toolchain
- Platform graphics and font development libraries
On Ubuntu or Debian, install the native dependencies with:
sudo apt update
sudo apt install libgl1-mesa-dev libx11-dev libxcursor-dev libxi-dev \
libxrandr-dev libxkbcommon-dev libwayland-dev libfontconfig1-dev \
libfreetype6-dev
Then build and run:
git clone https://github.com/HakanSeven12/OpenCADStudio.git
cd OpenCADStudio
cargo build --release --bin OpenCADStudio
The resulting binary is written to target/release/OpenCADStudio (OpenCADStudio.exe on Windows).
Web
Install the WebAssembly target and build tools once:
rustup target add wasm32-unknown-unknown
cargo install trunk wasm-bindgen-cli
Start the development server:
trunk serve
Automation
The desktop binary supports one-shot conversion, a persistent headless server, and a client-neutral MCP endpoint for AI applications:
OpenCADStudio --export input.dwg output.dxf
OpenCADStudio --serve
OpenCADStudio --serve --port 4242
OpenCADStudio --mcp
The automation server exchanges one JSON object per line over standard input/output or a local TCP socket. The self-contained MCP endpoint exposes the live desktop editor through the same tools to every compatible client. To connect a client, configure it to launch OpenCADStudio --mcp. See the MCP control guide.
Plugins
Desktop plugins run in separate processes and communicate with the host through the versioned plugin API. The browser build does not load native plugins.
Project documentation
Contributing
Bug reports, focused pull requests, translations, documentation improvements, and plugin contributions are welcome.
- Search existing issues before opening a new report.
- Use Discussions for questions and ideas.
- Report vulnerabilities privately by following the security policy.
Application translations live in locales/*/opencadstudio.ftl; source labels map through
src/locale_catalog.rs. After editing translations, run python3 scripts/export-locales.py
to refresh web and desktop packaging labels. Validate with python3 scripts/test_site.py
and cargo test --lib i18n::tests.
Project growth
Stars
Release downloads
Support the project
If Open CAD Studio helps your work, support continued development through GitHub Sponsors or Patreon.
License
Open CAD Studio is distributed under the GNU General Public License v3.0.