Roadmap

v0.1 — Direct Modeling Foundation

• [x] WebGPU-based 3D viewer with truck B-Rep kernel (WASM)
• [x] 4 primitives: cube, sphere, cylinder, torus
• [x] Boolean operations: union, subtract, intersect (cubes/cylinders only)
• [x] Translate transform
• [x] Save/load scenes as JSON (full B-Rep, no tessellation loss)
• [x] Responsive UI: desktop sidebar, mobile bottom sheet + dock
• [x] Auto-offset primitives — new objects partially overlap, ready for booleans
• [x] Docs: auto-generated screenshots + lesson videos (R2-hosted)
• [x] Deployed to Cloudflare Workers + custom domain

v0.2 — Undo/Redo + Gizmo

• [x] UUID identity — every object has a stable UUID v4, persisted through transforms and export/import
• [x] Undo/redo — snapshot-based with Ctrl+Z / Ctrl+Shift+Z keyboard shortcuts
• [x] Operation grouping — related operations (add + offset) grouped into single undo steps
• [x] Timeline UI — visual strip showing recent operations as clickable chips
• [x] Click-to-select — ray-cast picking via bounding sphere intersection
• [x] Translate gizmo — 3-axis colored arrows (X=red, Y=green, Z=blue), drag to move
• [x] Gizmo cancel — Escape reverses drag, restores original position
• [x] Automerge integration — CRDT-based op log for collaborative editing
• [x] Cross-tab sync — BroadcastChannel adapter for same-browser collaboration
• [x] Document management — new doc, share URL, example scenes
• [x] Keyboard shortcuts — Ctrl+Z undo, Ctrl+Shift+Z redo, Escape cancel, Delete remove
• [x] 24 E2E tests — Playwright tests covering all operations including gizmo

v0.3 — Parametric Modeling (Current)

• [x] ezpz constraint solver — integrated KittyCAD/ezpz for 2D sketch constraints (11 constraint types)
• [x] Sketch mode — 2D sketch on XY/XZ/YZ planes with points and edges
• [x] Sketch constraints — fixed, horizontal, vertical, distance, H/V-distance, coincident, parallel, perpendicular, equal length, midpoint
• [x] Constraint solver — Newton-Raphson solver via ezpz, live preview of solved positions
• [x] Extrude — 2D profile → 3D solid via truck tsweep (closed loop detection)
• [x] Quick rectangle — one-click constrained rectangle with auto-constraints
• [x] Sketch export/import — JSON serialization for Automerge replay
• [x] Automerge sketch ops — sketch_extrude in op log, collaborative replay
• [x] 31 tests — 9 Rust unit (sketch), 11 golden resource, 11 Playwright E2E sketch tests
• [ ] Rotate gizmo — circular handles for rotate-around-axis
• [ ] Scale gizmo — square handles for uniform/non-uniform scale

Medium Term

• [ ] Boolean ops for all shapes — fix sphere/torus booleans in truck-shapeops
• [ ] STEP import/export — leverage truck-stepio for industry-standard CAD interchange
• [ ] kkrpc integration — bidirectional RPC for server-side modeling operations
• [ ] Mesh raycasting — upgrade from bounding sphere to triangle-level picking
• [ ] Snap-to-grid — constrain drag/sketch to grid increments
• [ ] Multi-select — Shift+click to select multiple objects
• [ ] RDK (robotics) integration — CAD modeling with robot kinematics/planning

Long Term

• [ ] Assembly mode — multi-part assemblies with mates/joints
• [ ] Server-side rendering — headless WebGPU for thumbnails and CI screenshots (Tier 3)
• [ ] Revolve — 2D profile → 3D solid via truck rsweep
• [ ] Plugin system — extend with custom operations via WASM modules
• [x] Hugo docs site — full documentation site on Cloudflare Pages
• [ ] Mobile-first touch gestures — multi-touch transform gizmos

Known Issues

• Sphere/Torus booleans fail — truck-shapeops NURBS surface intersection crashes. Cubes/cylinders work.
• Object size changes after translate — bounding-box normalization rescales rendered objects. B-Rep geometry is correct.
• Large translations go off screen — camera doesn't follow objects. Keep values small.
• Bounding sphere picking — imprecise for elongated/flat objects. Mesh raycasting planned.