CAD Preview

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B-rep Tessellation via OpenCascade.js

STEP, IGES, and BREP files are parsed and tessellated by the OCCT kernel (compiled to WebAssembly). The WASM runs in the Node extension host — never in the webview — so there are no CSP issues and pure-mesh files never pay the WASM startup cost.

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Native Three.js Mesh Loading

STL, OBJ, PLY, and glTF/GLB files are loaded directly by Three.js loaders via a webview URI. No host round-trip, no tessellation — just fast native parsing.

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Orientation Cube & View Controls

A labeled orientation gizmo mirrors the current camera direction. Click any face to snap to that standard view. The collapsible view-controls panel lets you step-rotate, pan, zoom, fit, or reset the view without touching the mouse.

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Component Tree Panel

For multi-solid B-rep assemblies or multi-mesh glTF files, a component tree panel shows the hierarchy. Click any node to highlight that solid in the 3D view.

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Define Parts (Volumes / Surfaces / Lines / Points)

Click solids, faces, edges, or vertices in the 3D view and assign them to named parts (FEM sub-model-parts). Assignments are colour-highlighted, listed in a panel, and autosaved to a `.parts.json` sidecar — the CAD file stays read-only.

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Non-destructive Editing

Apply transforms (move / rotate / scale / mirror), booleans (unite / subtract / intersect), fillet/chamfer, feature modeling (extrude / revolve / sweep / loft), assembly ops (explode / mate), primitive creation (box/cube, sphere, cylinder, cone, torus, prism), 2D profile sketches (circle, rectangle, polygon) for use as extrude/revolve/sweep/loft profiles, and bottom-up wireframe modeling (points, lines, arcs → surfaces from lines → volumes from surfaces). Edits are undoable, replayable, and autosaved to a `.edits.json` sidecar — the CAD file stays read-only, and edits are baked in only on Export.

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Wireframe & Grid Helpers

Toggle wireframe rendering, world-space axes, and a reference grid — all from the toolbar.

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Lazy WASM, Fast Activation

The OpenCascade.js kernel is initialized only on the first B-rep open and then memoized. Opening STL or glTF files never loads the WASM at all. Extension activation is instant.

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Export to a Compatible Format

Convert the open model and save it via a native dialog. B-rep files (STEP/IGES/BREP) can export to each other (true OCCT writers) or to any mesh format; mesh files can export to other mesh formats.

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FE Mesh Generation (Gmsh)

Generate a finite-element mesh of the open model with Gmsh compiled to WebAssembly, shown as an overlay on top of the existing geometry. Options autosave to a `.mesh.json` sidecar plus a generated `.geo` script; export the result as hand-written Kratos MDPA (the default, preserving named Parts as SubModelParts) or any Gmsh format the panel offers (.msh, .msh2, .geo_unrolled, VTK, I-DEAS Universal, Abaqus, Nastran, SU2, INRIA Medit, STL, Diffpack, OFF). The CAD file stays read-only.

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MCP Server for AI Agents

A standalone Model Context Protocol stdio server (`dist/mcp-server.js`) exposes the same load/edit/mesh/export pipeline headless — no VS Code required. Agents like Claude Code can apply edit operations, manage parts and parametric variables, and generate/export FE meshes, persisting to the same sidecar files the extension reads. See the MCP Server reference page.

Format	Extensions	Pipeline
STEP	`.step`, `.stp`	OpenCascade.js → BRepMesh tessellation
IGES	`.iges`, `.igs`	OpenCascade.js → BRepMesh tessellation
BREP	`.brep`	OpenCascade.js → BRepMesh tessellation
STL	`.stl`	Three.js `STLLoader`
OBJ	`.obj`	Three.js `OBJLoader`
PLY	`.ply`	Three.js `PLYLoader`
glTF	`.gltf`, `.glb`	Three.js `GLTFLoader`

CAD PreviewInteractive 3D CAD and mesh previews in VS Code

B-rep Tessellation via OpenCascade.js

Native Three.js Mesh Loading

Orientation Cube & View Controls

Component Tree Panel

Define Parts (Volumes / Surfaces / Lines / Points)

Non-destructive Editing

Wireframe & Grid Helpers

Lazy WASM, Fast Activation

Export to a Compatible Format

FE Mesh Generation (Gmsh)

MCP Server for AI Agents

See It in Action

Supported Formats

Badges

CAD PreviewInteractive 3D CAD and mesh previews in VS Code

B-rep Tessellation via OpenCascade.js

Native Three.js Mesh Loading

Orientation Cube & View Controls

Component Tree Panel

Define Parts (Volumes / Surfaces / Lines / Points)

Non-destructive Editing

Wireframe & Grid Helpers

Lazy WASM, Fast Activation

Export to a Compatible Format

FE Mesh Generation (Gmsh)

MCP Server for AI Agents

See It in Action ​

Supported Formats ​

Badges ​

See It in Action

Supported Formats

Badges