forked from 1b-agent/opencadstudio-upstream
Hakan SevenandClaude Opus 4.8
c10e8dae44
A tolerance drew one row of ASCII soup — "RUN | ANGtol(M) | ..." — about a tenth of its proper size. Six defects, each independent. Rows were split on the two-character string "^J". A DWG stores a raw newline, and the text-DXF reader rewrites the on-disk ^J to one before we see it, so that split never fired on either mainstream path and every row collapsed into the first. It now normalises all four spellings the break arrives in — including the \P our own DXF writer emits, which made open-DWG → save-DXF → reopen asymmetric. Symbols were replaced with ASCII labels from a table that was itself wrong: it read r as circular runout, n as angularity, p as position. The font's own encoding says concentricity, diameter, projected tolerance zone, and the benchmark's pre-exploded reference agrees. That table was an inversion of acadrust's, which is self-contradictory — it binds n to two different meanings. Do not re-derive from it. The frame is a proportion of the character height: a compartment spans -h..+h about its row's centreline, so it is 2h tall and the margin falls out of that. It was built as height + 2*DIMGAP instead, which is a different entity's geometry — DIMGAP sizes the dimension line's break and the rectangle around a basic dimension, where it genuinely applies twice per axis. Even fed a self-consistent style that can only ever produce 1.5h, so it was wrong in kind rather than mis-fed. Height came from the entity's own field, which a DWG never sets — the reader carries only the style's handle, leaving a small non-zero default that a "> 0" test happily used. It now resolves the style by handle first and name second: a DWG records the handle and defaults the name, a DXF the reverse, so matching on the name alone would have picked the wrong style for every DWG-read tolerance. An entity may also override single style variables on itself, and this one halves its character height that way; ignoring that drew the frame several times too large. Rows stacked upward, every row inherited the widest row's columns, and one full-width border boxed them all — none of which showed while the parse only ever produced a single row. The insertion point sits on the first row's centreline; anchoring the frame's bottom-left there offset it by its own height, and by an amount that changed with the row count. Cell text ran together because the glyph run asked for no letter spacing while the width measurement assumed the font's own, so the characters crowded inside correctly-sized boxes. Compartments are also measured by what they draw now: the pen advance stops one letter-space past the last glyph, and counting that made every one of them too wide. Symbols come from a bundled stroke font, restored from this repository's own history: it shipped QCAD's gdt.cxf until the text engine moved from CXF to LFF, which removed every .cxf and left nothing in their place — the ASCII labels date from exactly there. Converted to LFF, keyed by the letter its \Fgdt;X escape carries, and registered under that name like any other font, so a switch to it resolves through the ordinary lookup: an MTEXT carrying the escape, or a text style named gdt.shx, reaches it too, with no code of their own. The geometry is public domain by explicit waiver; provenance is in the file's header. Co-Authored-By: Claude Opus 4.8 <[email protected]>
Open CAD Studio
OCS is a CAD application for 2D drafting and 3D modeling, built with Rust. Reads and writes DWG and DXF files natively. Also has a web version now!
OCS Web try it in the browser: https://hakanseven12.github.io/OpenCADStudio/
Features
File Formats
- DWG read/write (R13 through R2018)
- DXF read/write (R13 through R2018)
- STL export (
STLOUT/EXPORTSTL) - STEP AP203 export (
STEPOUT) - OBJ import (
IMPORTOBJ) - PDF export (plot layouts to PDF)
- WBLOCK — write selected entities or a block to an external file
- XREF — attach, reload, and auto-resolve external references
2D Drafting
| Command | Description |
|---|---|
LINE, PLINE, RECTANG, POLYGON |
Basic geometry |
CIRCLE, ARC, ELLIPSE, SPLINE |
Curves |
HATCH, HATCHEDIT |
Hatch fills with pattern, scale, angle editing |
OFFSET, TRIM, EXTEND, FILLET |
Modify geometry (supports lines, arcs, ellipses, polylines, splines) |
BREAK, STRETCH, LENGTHEN |
Shape editing |
ARRAY, MIRROR, MOVE, COPY, ROTATE, SCALE |
Transformations |
EXPLODE |
Explode blocks, dimensions, polylines, mlines |
DDEDIT |
Double-click text editing |
MASSPROP |
Area, perimeter, centroid of selected entities |
3D Modeling
| Command | Description |
|---|---|
BOX, SPHERE, CYLINDER |
Solid primitives |
EXTRUDE, REVOLVE |
Profile-based solids |
LOFT |
Ruled-surface loft through cross-sections |
SWEEP |
Sweep a profile along a path |
ARRAY3D |
3D array |
| ACIS tessellation | Renders 3DSOLID, REGION, and BODY entities |
Annotations & Dimensions
- Dimensions: Linear, Aligned, Angular, Radial, Diameter, Ordinate — with full
DIMSTYLEsupport (DIMASZ,DIMSCALE,DIMEXO,DIMEXE, and more) - Text:
MTEXT,TEXT,DTEXTwith font browser (STYLE DIALOG) - Leaders:
MLEADERwith straight and spline path types;MLEADERSTYLEmanager - Tolerances: GD&T feature control frames
- Tables:
TABLEentity render;TABLESTYLEmanager - MLine:
MLINEentity withMLSTYLEmanager andEXPLODEsupport
Paper Space & Layouts
- Multi-tab layout system with model space and unlimited paper space tabs
- Viewport projection: Model content correctly projected into paper-space viewport rectangles
- Camera persistence: View position and zoom saved per layout; restored on file open and tab switch
- Correct paper size: Physical paper dimensions read from embedded PlotSettings (not drawing limits)
- Inline MSPACE overlay — enter a viewport with double-click; edit model entities in place
VPORTS— preset viewport configurations (single, 2H, 2V, 4-way)LAYOUTMANAGER/LAYOUTPANEL— GUI layout managerPLOTSTYLEPANEL/STYLESMANAGER— plot style table editor (CTB/STB)PRINT— send layout to system printer
Blocks & References
INSERTwith attribute prompting (ATTREQ)ATTEDIT— edit block attribute values interactivelyREFEDIT/REFCLOSE— in-place block reference editingXREF— attach, reload, and resolve external DWG/DXF referencesDATAEXTRACTION— export entity property data to CSV
Snapping & Precision
- Object snaps: Endpoint, Midpoint, Center, Node, Quadrant, Intersection, Perpendicular, Tangent, Nearest, Insertion, and more
- Ellipse arc endpoints, LWPolyline arc midpoints, Hatch boundary points
- Object Snap Tracking (
OTRACK/F11) - Polar Tracking with configurable angle increment
- Dynamic Input overlay (
DYNMODE/F12) - Grid snap with adaptive spacing
- Command history navigation (↑ / ↓)
Rendering
- GPU-accelerated via WebGPU (wgpu)
- 4× MSAA anti-aliasing
- Orthographic and perspective camera
- ViewCube with face/edge/corner snapping
- Wide polylines: LWPolyline and Polyline2D filled strokes
- Raster images: GPU-textured quad pipeline (
IMAGEcommand) - Wipeout: Solid fill masking
- Complex linetypes: Text and shape elements rendered in linetype patterns
- White/black entity colors adapt to background luminance
- Per-viewport background color (
BACKGROUND) - Visual style selector (Wireframe, Shaded, etc.)
- X-ray ghost pass for selected wires occluded by geometry
UI
- Modular ribbon interface — Home, Insert, Annotate, View, Manage, Layout
- Command line with autocomplete and history
- Layer Manager with per-viewport freeze columns
- Properties panel
COLORSCHEME— runtime theme switchingSHORTCUTS— keyboard shortcuts panelSPLINEDIT— close, open, reverse spline control points- UCS icon with 3D foreshortening and axis labels
Installation
Linux (AppImage)
Download OpenCADStudio-*-linux-x86_64.AppImage from the latest release, then:
chmod +x OpenCADStudio-*-linux-x86_64.AppImage
./OpenCADStudio-*-linux-x86_64.AppImage
No installation required — runs directly on any modern Linux distribution.
Windows
Download OpenCADStudio-*-windows-x86_64.exe from the latest release and run it directly. Windows SmartScreen may show "Windows protected your PC" because the binary is not yet code-signed — click More info → Run anyway.
macOS (Apple Silicon)
Apple Silicon (M-series) only; Intel macOS isn't built. The app is ad-hoc signed but not Apple-notarised (notarisation requires a paid Apple Developer ID), so macOS Gatekeeper guards the first launch. Pick whichever path is easiest:
Option A — Homebrew (recommended):
brew install --cask --no-quarantine \
https://raw.githubusercontent.com/HakanSeven12/OpenCADStudio/main/packaging/homebrew/open-cad-studio.rb
--no-quarantine lets Gatekeeper skip the unsigned-app prompt. See packaging/homebrew/ for publishing this as a brew tap.
Option B — manual .dmg:
Download OpenCADStudio-*-macos-arm64.dmg from the latest release, open it, and drag OpenCADStudio.app to /Applications. If the first launch is blocked, clear the quarantine flag once:
xattr -dr com.apple.quarantine /Applications/OpenCADStudio.app
On older macOS you can instead right-click OpenCADStudio.app → Open and confirm; on macOS Ventura and later, approve it via System Settings → Privacy & Security → Open Anyway.
Build from Source
Requirements: Rust 1.75+
git clone https://github.com/HakanSeven12/OpenCADStudio.git
cd OpenCADStudio
cargo build --release --bin OpenCADStudio
./target/release/OpenCADStudio
Star History
License
GPL-3.0-only — see LICENSE