dsh-cad — CAD Plugin for DeepSeek Harness

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A CAD plugin for DeepSeek Harness (dsh): an embedded 3D/2D CAD viewer plus a native parametric modeling tool family (OCCT kernel) in the Web UI, letting the agent build and inspect CAD geometry step by step — "model while you watch".

Preview

A full modeling session, end to end: the agent builds a parametric assembly from plain chat — a 120×80×8 base plate with R5 rounded corners, then four bolt instances placed at the corners — while the resident CAD panel tracks every step live (parts tree with per-instance colors, ViewCube, "装配体" assembly tab, 5 instances · 1,740 triangles). The finished assembly exports as a structured STEP document and the agent verifies it by reading the file back — 2 solids, 3 products, 2 assembly usages, 1,125.00 mm³:

Downloads

Cumulative downloads from the npm registry, refreshed daily by CI:

Feature Overview

Capability	Description
⚙️ Kernel chain: cadorange → occt.ts	Modeling goes through cadorange (the agent-native CAD runtime wrapping the occt.ts/OCCT WASM; public API + the supported cadorange/occt escape hatch for meshing/HLR/wire construction); the direct occt.ts adapter stays as the fallback tier — DSH_CAD_KERNEL pins one explicitly (the opencascade.js tier was removed in v0.15.1, −64MB install). The old "no editing after shell" seam is gone — fillet/chamfer/boolean keep working after shelling
🔍 CAD viewing	STL / OBJ / STEP / IGES / BREP / DCPRT (3D), DXF / SVG (2D); interactive viewport in the resident right panel (orbit / zoom / wireframe / pan), with a one-line result row in the conversation
🌗 Dark-mode surfaces	Every rendered surface follows the host theme — viewport slab, DXF/drawing strokes, the Three.js grid / XYZ triad / feature edges / default mesh color / sketch overlays, and the ViewCube plate; a theme flip restyles mounted viewers live. Overrides: --dsh-cad-bg, --dsh-cad-stroke, --dsh-cad-paper
🧭 CAD editor interactions	Onshape-style ViewCube (26-zone click-to-orient), hover/click face & edge picking with live measurement (area mm² / length mm), Faces+Edges / Faces / Wireframe render modes, switchable BRep demo parts (bracket / flange / shaft)
🏗️ Parametric modeling	Primitives, profile extrusion, loft, sweep, revolve, booleans, all-edge fillet/chamfer, shell, draft, patterns (linear/circular), transforms; profiles take curve segments (arcs/circles exact BRep; B-splines sampled approximation) — exact OCCT BRep, not a mesh approximation. cad_loft sections accept curves too: point loops, {through} splines or planar {profile} chains; smooth: true fits a periodic B-spline through point loops — one continuous B-spline lateral face instead of planar strips meeting at G0 creases
✏️ Named sketches	Standalone named profiles (Sketch1…) kept in the document (cad_sketch_new / edit / list / delete); extrude/revolve/sweep reference them by name, and cad_sketch_edit rewrites the definition in place + replays the log, rebuilding every dependent feature — the parametric loop. Sketches render as Onshape-style blue curves + plane frame in the viewport (refreshing live on edit), listed in a left-side feature tree (sketches + features, eye-toggle visibility, click-to-highlight bodies) ov

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