chili3d

Chili3D is an open source 3D CAD application that runs in the browser. It compiles OpenCascade to WebAssembly and renders through Three.js, and it offers parametric and direct modeling in one document, viewport, and undo stack, so a shape built by hand can be edited by the assistant and an AI-built body stays a feature tree that can be changed.

The built-in assistant runs entirely in the browser and calls the LLM endpoint directly with the user's own API key, with no relay server in between. It reads and writes the same document, selection, and feature tree as the modeling commands, and every change it makes lands in the same undo stack. A local bridge option connects the page to a separate chili3d-mcp server over a WebSocket so an external agent can read and edit the open document.

Parametric bodies are feature-list models in the Onshape and Fusion style: an ordered list of features replayed top to bottom on every rebuild, with sketches, constraints, variables, and tracked references. Direct modeling works on the geometry itself with no feature history. The app imports and exports STEP, IGES, BREP, and STL, and the README also describes a commercial Chili3D Pro edition for in-place direct editing.