Christopher OverbeckandClaude Fable 5.1
2697b60d21
This wires the chain walker into the association system proper, and adds the entry point PR2 calls. Resolution. `resolve_reference_chain` walks the chain, evaluates the osnap feature in the entity's own coordinates, lifts it to model space through the block path, and — when the chain goes through a viewport — projects it onto the sheet with that viewport's `ViewportFrame`. Both points are kept: the dimension holds paper points, the value it displays is a model length. `ChainMap` is the one place that conversion lives, including a `map_radial` that carries a radial source's plane into the dimension's space so the radius/diameter/arc paths need no viewport special-casing of their own. Which space a stored osnap point was written in is not recoverable from the record — our own writer used model/WCS, AutoCAD's trans-space records use the dimension's space, and both turn up in the same drawing — so both readings are mapped down to the entity and the one that lands on the geometry wins. It is only ever a hint that disambiguates candidates, never the answer. Creation. `Scene::attach_viewport_dimension_association` takes one `AcceptedSnap` per definition point and writes the whole chain: viewport handle, block path, entity, osnap type, sub-entity marker and parameter, plus `trans_space` on the association. Every link becomes a reactor target, not just the innermost entity, so a change anywhere along a chain reaches the refresh through the ordinary dependency index. Refresh. `refresh_associative_dimensions` now matches a changed handle anywhere in a chain (including the second chain of an intersection), so a viewport change reaches the dimensions drawn through it. Perpendicular and tangent references resolve in a second pass, measured from the other definition point. A dimension carries its sheet annotation with it: the dimension-line standoff and a user-dragged text position move by the centroid shift of the points that actually moved, so a one-ended edit keeps the dimension line centred instead of collapsing it. For a trans-space linear or aligned dimension the displayed value is recomputed from the model points and multiplied only by the user's DIMLFAC (`MeasurementScale::model_factor`) — the viewport compensation is inherent in having measured in model space, and applying it again is the double-scaling this three-PR effort exists to stop. Broken references. Brokenness is derived, never written: a reference whose source was erased simply stops resolving, the dimension keeps its last valid appearance, and the record is left byte-for-byte as it was. An undo that restores the source restores the link with no extra bookkeeping. `Scene::dimension_association_status` reports it per slot. `dimension_is_associative` now walks the chain too, instead of accepting any surviving handle in `xrefs` — which was true even for a trans-space reference whose actual geometry had gone, because the viewport was still there. Undo. Creating an association journals the new object and every reactor list it touches; refreshing a dimension journals the dimension's before-image. Both were previously invisible to the delta recorder. Co-Authored-By: Claude Fable 5.1 <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.