OneCAD/ROADMAP.md

SolveCraft roadmap

Status as of 2026-10-11. SolveCraft targets Fusion-style parametric modelling (sketch → features → parametric timeline) as an open, pure-Rust, agent-drivable application.

At a glance

Question	Answer
Where are we?	M0 and M13 done; M1, M2, M5–M7, M9, M10, M14 in progress. Sketch with solver and the full SKETCH create/modify set; extrude, revolve (two sides, symmetric, to object), fillet/chamfer (variable radius, chord length, a radius per edge, corner patches), holes, threads (cosmetic and modelled), patterns, mirror, shell (inside/outside/both), draft, loft, sweep, coil, split body and split face, delete face, construction planes, axes and points; persistent naming of faces and edges; parameters and configurations; components, joints, motion studies, exploded views; sheet metal and a plastic enclosure subset; STEP/IGES/3MF/STL/OBJ/DXF; autosave and crash recovery; desktop and browser (wasm) app, CLI, MCP server, oracle harness.
Command parity (in scope)	335 / 541 (62%) in-scope commands; SOLID + SKETCH 188 / 291 (65%) — docs/parity.md; registry breadth does not establish workflow or geometric parity
Fusion oracle	76 / 76 parts match in the checked-in historical report — docs/oracle.md. The current sprint adds independent analytic and UI regressions; the local Fusion oracle corpus has not been rerun.
Tests	Solver, profiles, kernel booleans/blends/measures, expressions, timeline, persistent naming, file formats and migrations, assemblies, sheet metal, engine end-to-end, hostile-input fuzz over every command and headless UI scenarios. cargo xtask ci reports the current passing counts.
Gates	cargo xtask ci: fmt, clippy -D warnings, tests, asset attribution, layering, wasm32 build — green
Time to a useful alpha (M0–M6)	≈ 82 agent hours remain (sum of the M1–M6 estimates below)

Scope (owner decision, 2026-10-07)

The issue batch adds preservation of blind pockets in through cuts, associative projected offsets and plastic face placements, XZ (+Y normal) with a v6 migration preserving older designs, interactive angle placement, file-picker sketch imports, Home/recent controls, toolbar overflow, and the remaining component-frame and assembly WIP work. The enclosure acceptance scenarios now include board resizes; STEP reopening is automated. Inspection in Fusion remains an external acceptance step. See WIP reconciliation.

In scope, in priority order:

1. SOLID and SKETCH (now).
2. Parameters / functional constraints (done: see parameters.*, expr.evaluate; unit-aware, cycles reported with their path, rename follows references, deletes list their users): user parameters with units and expressions (+-*/, ^, parentheses, sin/cos/sqrt/min/max/floor/ceil/round, unit conversion), model parameters d1, d2… for every dimension and feature input, references between parameters with a dependency graph and cycle detection, re-evaluation on change, comments, favourites, CSV/JSON import and export.
3. Components and assemblies with joints (M9).
4. SHEET METAL: flange, contour flange, bend, unfold/refold, flat pattern with DXF export, sheet metal rules (thickness, K-factor, bend radius) (M10).
5. A small PLASTIC subset for enclosures, after sheet metal: Boss, Rib, Web, Lip/Groove, Snap Fit.

Deferred until further notice: MESH, FORM (T-splines), SURFACE beyond what solids need, PCB / 3D PCB / Package, Render, Animation, Simulation, Manufacture/CAM, Drawings. The parity report's headline counts in-scope tabs only and lists the deferred ones separately.

Milestones

#	Milestone	Status	Hours left
M0	Vertical slice	done	—
M1	Sketch depth: command coverage implemented — projection/intersect/include as linked geometry (auto-project on faces, lost-reference warnings, break link), full SKETCH create/modify set (slots, polygons, tangent arcs/circles, ellipse, fit/control splines, conic, text, trim/extend/break, fillet/chamfer, offset, mirror, patterns, move/scale, blend curve, centerline), constraints incl. curvature and polygon with over-constraint refusal, driven/arc-length/linear-diameter dimensions, AutoConstrain, DXF/SVG insert, 3D sketch curves (Project To Surface, Intersection Curve, Isoparametric Curve, Spun Profile), exact free-form profiles (B-spline/NURBS edges, any spline degree, curves cut by crossings), sweeps and pipes along 3D sketch curves, canvases and decals, curvature combs. Remaining workflow repairs: exact free-form Extend intersections, associative free-form Offset, and consistent occurrence-frame 3D wire authoring	in progress	4
M2	Robust modelling: coplanar booleans in the kernel, holes (placed on faces and on sketch points), threads (cosmetic, then modelled), patterns, mirror, shell, draft, split, construction geometry	in progress	16
M3	General fillets and chamfers (curved edges, chains, vertex blends); saddle rolling-ball surfaces now use continuous seam sections and arc-length fitting with shared contact boundaries and bounded accuracy checks	in progress	30
M4	Files: STEP import (done: all 29 Fusion STEP files — docs/step-import.md), 3MF export and 3MF/STL import as mesh bodies (done), DXF sketches, OBJ import	in progress	6
M5	Persistent naming of faces and edges (plan/adr/0002): faces named from their history (sketch curve sides, caps, revolve sections, primitive sides, blends, pattern/mirror copies; split pieces numbered), edges by their faces; fillets/chamfers, sketches on faces, shell/draft/offset/replace faces, hole placements, joint origins and face appearances resolve by name first and warn when the entity split or vanished: done. sheet metal edges by base sketch line and flange side, shell inner faces, sweep and loft roles: done. Left: kernel-reported face history (exact through coincident surfaces)	in progress	20
M6	UI depth: selection feedback and origin (done), timeline editing (done: hover and selection highlight modifier faces, including fillets and chamfers; edit feature, history marker drag, reorder with dependency checks, suppress, rename, delete with dependents, re-resolved references; redefining selections refreshes persistent edge/face references while retaining feature identity and dimension names), right-docked dialogs (done), live previews for every feature dialog (done), keyboard-first commands with on-canvas value boxes and sketch inline dimensions (done), drag manipulators with automatic join/cut (done: extrude incl. two sides, fillet, shell, hole depth, move, pattern spacing, revolve rotator; taper handle open), dark theme (done), right-click menu with Repeat (done), measure tool (done), section analysis (done), selection filter (done), drag-solve of sketch points (done); appearance controls now preserve body/face/component targeting, named transparent looks, reuse/search and override removal; preferences	in progress	6
M7	Sweep, loft (incl. to a point), rib and web (to next / depth), emboss (planar faces), thread (cosmetic, and modelled M3–M20 outside and inside: the ISO profile screwed in as a faceted cut), coil (smooth B-spline helical walls), pipe, pattern on path, patterns of bodies and components, replace face (parallel), align, remove, feature copy/paste: done. Left: emboss on curved faces, exact (unfaceted) modelled threads	in progress	12
M8	Surface workspace	deferred	—
M9	Components and assemblies (Fusion-style): New Component / Create Components from Bodies, active component, per-component origin/bodies/sketches/timeline entries, occurrences with transforms, Copy/Paste vs Paste New, nested Browser tree with visibility and isolate; Ground, Move/Copy of occurrences, joints (rigid, revolute, slider, cylindrical, pin-slot, planar, ball) by joint origins with limits and Drive Joints, As-built Joint, Rigid Group, Contact Sets (driving and motion studies stop where bodies in a set would pass through each other), Motion Study (joint values keyed along a timeline, playback, export of occurrence positions as JSON/CSV), Exploded views (automatic or by hand, shown without changing placements); interference, per-component physical properties; STEP with assembly structure. Physical properties now measure material-aware component/occurrence placements, descendants and repeated instances, including pending moves and body reassignment offsets; contact geometry and automatic exploded centres respect those offsets. Groundwork done: component tree, occurrences with transforms (instances, Paste New), world placement, active component as authoring frame, ground, Capture/Revert Position, moving bodies and sketches. UI: ASSEMBLE panel dialogs for New Component, Joint (snaps on faces, edges, circles and vertices; animated motion preview; offsets, flip, limits), As-built Joint, Joint Origin, Rigid Group, Drive Joints (live slider), Motion Link and Interference (overlaps shown red); joints in the timeline and the Browser	in progress	32
M10	Sheet metal: flange (base, edge, contour), hem, unfold/refold, convert, flat pattern + DXF, rules: done (oracle 67-76). PLASTIC enclosure subset: Boss, Rib, Web, Lip/Groove, Snap Fit, Rest, Plastic Rules (library, edit, assign; rule draft and clearance as feature defaults): done, no Fusion oracle (licence), tested against hand-computed geometry. UI: SHEET METAL and PLASTIC tabs in Fusion's layout with dialogs (live preview, Edit Feature, pre-selection) for Flange, Hem, Unfold/Refold, Convert, Sheet Metal Rules, Create Flat Pattern (flat view with bend lines, bend table CSV/JSON and DXF export with exact circle/arc/line cutouts), Boss, Lip/Groove, Snap Fit, Rest, Manage and Assign Plastic Rules; Fold (bend along a sketch line)	in progress	36
M11	2D drawings	deferred	—
M12	Release: installers, signing, docs, performance	planned	16
M14	Configurations: a table of rows (parameter expressions and feature suppressions per row) switched with config.activate (undoable, all or nothing), kept through parameter renames and feature deletes (config.configure, config.table, config.column/row/activate). Per-row body materials and appearances (library looks, custom colour/opacity and clearing overrides), undoable activation and save/reopen: done. Ordered typed configuration rules, atomic validation and structured rule editing: done. Left: component/face style columns	in progress	4
M13	Never lose work: atomic saves (temporary file, flush, rename; a crash at any moment leaves the old file or the new one) with the replaced version kept as <file>.bak; autosave of unsaved changes to the recovery folder every 5 minutes (preference) and after big operations, only when something changed; "Recover unsaved design?" on the next launch (doc.recovery_list, doc.recover, doc.recovery_discard); a kill-mid-save test (process killed while saving a 0.5 MB design 25 times). File format: "format": "solvecraft/8", older formats upgraded step by step (doc::format), newer ones refused with a message, out-of-range numbers and broken placements refused; a corpus of designs saved by M0, components-era, joints-era and current builds (apps/solvecraft-cli/tests/corpus) that must open and evaluate as saved; damaged and hostile variants (truncation, bit flips, hostile values, removed keys, repeated features, deep nesting) never panic	done	6

Known limitations

• Fillets and chamfers: constant, variable-radius and chord-length fillets; a radius per edge, rounds next to earlier rounds of another radius, and smooth corner patches where three rounds meet (a sphere for equal radii); straight edges (convex or concave) between planar faces with perpendicular planar end faces (equal-distance chamfers also meet sloped planar end faces, including inner basin rims within the rim width); convex fillets also meet sloped planar ends and reflex corners around pocket rims, with unequal wall slopes and extensions confined to the face; connected equal-distance chamfers also trim each other across unequal sloped rim walls; whole smooth loops of a planar face, picked whole or by one edge (tangent chain), including circles and walls at any angle (boss bases and tops, bores, pocket floors, plate outlines), loops with sharp corners between straight edges (the blends meet in mitres), runs of neighbouring edges along a planar face's loop (two top edges of a box: mitred, ending square; with the edge between them too, the corner becomes a sphere octant), rounded corners rounded again (sphere octants, tori at concave corners); every edge of a convex planar body or of an extruded part; fillets inside patterns; closed chains of curved edges between any two smooth sides (a branch pipe on a main pipe), by a rolling ball (the blend a rational B-spline through exact arcs), closed or ending at planar faces square to the edges.

• Booleans: prisms along one direction (plates with holes, slots, patterns of them, equal sections stacked end to end) are combined exactly in 2D; bodies touching along one whole face (a part and its mirror image) are stitched; coincident planar faces are pushed apart when their neighbours are planes or cylinders. Other coincident curved configurations can still fail. Bounded containment classification preserves fully internal cavities and nested material islands independently of shell order, with STEP round-trip and material-membership regressions. Near-contact curved shells use the general boolean path rather than a containment shortcut. Spheres are built from six pole-free patches.

• Mass properties come from fine tessellation (curved faces within ~1e-4 relative); triangles that cut through curved faces (trimmed faces after booleans) are split onto the surface first.

• STEP import (our own reader, crates/kernel/src/step_in; all 29 Fusion STEP files pass cargo xtask step-corpus) reads solids (B-rep with analytic and B-spline geometry), units, product names, colours and assemblies; analytic offsets on planes, cylinders, cones, spheres and regular tori are read exactly (signed/nested distances, units and face sense). Freeform offset surfaces and pcurve-only edges are not read yet, and assembly components are flattened into bodies. Closed periodic faces (torus, B-spline bands) are split in two for meshing; measure() uses a finer tolerance for small radii.

• Persistent naming (plan/adr/0002) names faces from their history and edges by their faces; references resolve by name first and warn when the entity split or vanished. Kernel-reported face history (exact through coincident surfaces) is not wired in yet.

• Modelled threads are cut as a faceted body (curved faces within 1/200 of the pitch); Extrude and Revolve To Object on a curved face cut the tool back to the target's surface.

• Explicit sketch breaks preserve exact ellipses, fit/control splines (including high degrees) and conics; analytic trim/break also sees free-form cutters. Free-form curves cut at a tangent touch (no clean crossing) enter that profile as polylines. Sweeps along 3D sketch curves follow their polyline (smooth walls when the path is smooth).

• Shell and offset faces work on bodies of planes, cylinders, cones and spheres (convex or not: filleted boxes, bosses, domes, countersinks); draft on convex planar bodies and on walls (planes, cylinders → cones) between caps; lofts through three or more sections are smooth (B-spline sides through every section), two sections ruled.

• Sketch corner tools: fillet and all three chamfer modes pick a connected corner even when its endpoint overlaps the fixed origin or a loose point. Ordinary drawing still snaps to the origin; clicked UI regressions verify geometry, closed profiles and undo.

• Face projection: closed boundaries have a deterministic outer-first order. Refresh matches existing geometry before assigning positions, retaining saved curve IDs and constraints across enumeration changes and resize, including concentric circles. Ambiguous identities retain the last geometry and report a lost reference; permutation matching is bounded.

• Inline sketch dimensions: Tab and Shift+Tab cycle within the active shape's value boxes, selecting visited values for replacement. Expression completion retains forward-Tab priority; real keyboard regressions cover rectangles, lines and single-value circles. Typed lengths, radii, line angles, signed arc sweeps and slot lengths persist as constraints and expressions through save/reopen. Shape creation and its dimensions form one undo step; rejected values keep the editable field focused.

• Repeated components: Browser selection, visibility, properties, copy and Move/Copy use checked occurrence paths. Active nested occurrences author planar sketches and solids in their selected frame. Pending moves compose through parents; dialog cancellation restores its selected move. Source materials and body/face appearances follow transformed instances. Shared nested definitions remain shared, and legacy 3D wire authoring and deep Paste New need further work. See occurrence workflows.

• Configuration rules: ordered typed conditions can drive parameters and suppressions or restrict values. Preview explains effective values without modifying the document; applying rules validates rows atomically. Length expressions retain their authoring units across document-unit changes. The UI supports structured All/Any/Not conditions and rule ordering. Component and face style columns remain open. See configurations.

• Sheet-metal material: inherited holes, crossing edge notches, overlapping cuts and retained islands share the same boundaries in flat preview, DXF and unfolded solids. Detached material pieces survive unfold/refold as one logical sheet group, including split flanged sheets. Circular cuts crossing bends remain unsupported; free-form bases use bounded sampling.

• Rolling-ball fillet accuracy: independent offset-cylinder tee references check surface distance, actual trimmed tessellation, supporting-cylinder contacts and tangency at two scales. The measured trimmed-part error is below 0.0001 mm; this is an analytic geometry check, not a new Fusion oracle result. Under-resolved fits return an error.

• Contact driving checks the trajectory between clear endpoints, including linked joints, playback and sparse motion exports. Checks use bounded tessellation samples, not exact continuous collision detection; local thin walls and small details remain limitations. See contact-set limits and recovery.

Kernel

truck (Apache-2.0) behind our own kernel crate, with our own blend operation and boolean retry/validation; see plan/adr/0001-geometry-kernel.md (local) — summary in README.