Homer

Homer is a browser-based parametric 3D component studio for home design. Every component — cups, gears, planters, bookcases, closets, kitchen cabinet runs, desks, lumber shelving, sinks, whole rooms — is built side by side by two independent geometry engines: manifold (main-thread WASM CSG) and replicad/OCCT (a worker-thread CAD kernel), rendered in synced three.js viewports.

Why

Parametric CAD in the browser usually means committing to one geometry kernel and living with its blind spots. Homer runs two: a fast CSG engine for instant feedback and a full OpenCASCADE kernel for CAD-grade solids. Building every component twice, from one shared parameter model, keeps both engines honest — a divergence between the viewports is a bug surfaced for free.

How it works

• Dual engines, one param panel. A shared params panel drives both builds; drag handles snap to standard dimensions. Cameras stay synced across viewports.
• Engine-agnostic geometry core. shared/cad/* holds the geometry models (cabinet, closet, desk, sink, lumber catalog, …) consumed by both engines — the component definition is data, the engines are interchangeable backends.
• OCCT off-thread. The OpenCASCADE WASM kernel loads dynamically inside a web worker, keeping the main thread responsive while CAD builds run.
• Wood stock library. /stock catalogs purchasable lumber, plywood, engineered board, and MDF at real-world dimensions with $/sq-ft pricing and a real-scale 3D preview.
• No server. Nuxt 4 SPA, no API routes, no database — configs persist to localStorage.

Status

Live in production at homer.exesiv.dev.

Links

• Live app: homer.exesiv.dev