0.1 support matrix

Feature-by-feature boundary for authoring, Manifold, stock OpenCascade, and the owned OCCT facade.

Legend: Yes is release-gated public behavior, Partial is usable with an explicitly documented weaker contract, and No is not advertised.

Modeling

Feature	Authoring	Manifold	Stock OCCT	Owned facade
Box, cylinder/cone, sphere	Yes	Yes	Yes	Yes
Planar sketches and holes	Yes	Yes	Yes	Yes
Extrude, symmetric extrude	Yes	Yes	Yes	Yes
Twist/top-scale extrude	Yes	Yes	No	No
Revolve	Yes	Yes	Yes	Yes
Ruled solid loft	Yes	No	Yes	Yes
Polyline path sweep	Yes	No	Yes	Yes
Circular-arc path sweep	Yes	No	Yes	Yes
Composite line/arc sweep	Yes	No	Bounded	Stronger bounded refinements
Boolean operations	Yes	Yes	Yes, partial history	Yes, complete bounded evolution
Transform	Yes	Yes	Yes	Yes
Fillet/chamfer	Yes	No	Yes, partial history	Yes, complete bounded evolution
Shell/whole-solid offset	Yes	No	Yes, partial history	Yes, complete bounded evolution
Draft	Yes	No	No	Yes

Topology

Capability	Manifold	Stock OCCT	Owned facade
Face/edge/vertex snapshot	No	Yes	Yes
Semantic roles and sketch source	No	Yes, feature-dependent	Yes, feature-dependent
Geometry and adjacency queries	No	Yes	Yes
Selection explanations	Snapshot-dependent	Yes	Yes
Persistent signature protocol v2	No	Yes	Yes
Stored v1 compatibility profile	No	Yes	Yes
Complete feature evolution	No	Partial	Selected feature slices

Construction and complete history are separate columns conceptually. A stock OCCT fillet may construct successfully while downstream semantic lineage is partial.

Product structure and analysis

These evaluator-level features work with either kernel when all underlying geometry features are supported:

• parameters and dimension-safe expressions
• materials and density expressions
• parts and fixed-placement nested assemblies
• named configurations
• instance suppression and part-material overrides
• deterministic BOMs
• geometric and physical mass properties
• canonical documents, migration, validation, and hashing
• design-impact and effective-feature hash reports

Measurement	Manifold	Stock OCCT	Owned facade	Assembly aggregate
Volume, area, bounds, center, inertia	Yes	Yes	Yes	Yes
Genus	Exact per connected mesh component	Unsupported (null)	Unsupported (null)	Unsupported (null)

A numeric genus is exact for the backend representation. Unsupported results are explicit null; no backend or assembly path guesses, clamps, or silently converts the value.

Exchange

Format	Manifold	OCCT
Binary STL	Yes	Yes
ASCII STL	Yes	Yes
OBJ	Yes	Yes
STEP	No	Yes
Text BREP	No	Yes
Binary BREP	No	Yes

The strong deterministic STEP paragraph and verified-import table below describe the unreleased 0.2 line. The exchange table above remains the published 0.1.1 boundary.

The bundled zero-override stock OCCT runtime additionally advertises single-solid deterministic STEP export protocol v1: identical bytes require the same backend shape representation, resolved metadata/options, implementation, and exact runtime artifact. Explicit wasm, moduleFactory, and attested runtimes retain weak raw STEP and omit this envelope until separately qualified. This is narrower than geometric canonicalization and does not make STEP a portable artifact or cache format. Exact aggregate body-set and assembly STEP remains unsupported.

The unreleased public imported-body workflow admits exactly one committed solid through stock OCCT’s strong document-body import capability:

Imported format	Required media type	Unit policy	Manifold	Stock OCCT
STEP	model/step	File units	No	Yes
Text BREP	text/plain	Declared mm, cm, m, or in	No	Yes
Binary BREP	application/octet-stream	Declared mm, cm, m, or in	No	Yes

This is a separate opaque one-body document and Evaluator.evaluateImportedBody(...) method. It verifies a caller-supplied SHA-256 and byte-length commitment before parsing, fixes healing to none, and does not publish the broader Document v7 product model. Multibody import, assembly import, repair/healing, automatic file/URL I/O, and approximate fallback remain unsupported.

Runtime coverage

Environment	Release gate
Node.js 22.13	Full package checks
Node.js 24	Full package and documentation checks
Node.js 26	Tests, coverage, package, and security gates
Chromium production bundle	Manifold and stock OCCT smoke
Firefox/Safari	Not yet release-gated
Deno	Not claimed

Explicitly not in 0.1

• drawings, dimensions, PMI, and GD&T
• sheet metal and flat patterns
• assembly mates, joints, motion, interference, and contact
• CAM, toolpaths, posts, and stock simulation
• CAE/meshing/solver workflows
• general surfacing, NURBS editing, healing, and feature recognition
• variable fillets/chamfers and advanced shell modes
• complete transparent cross-run native shape caching

For the exact path-conditioning and topology-protocol boundaries behind this matrix, read the complete guide.