> ## Documentation Index > Fetch the complete documentation index at: https://invariant-cad.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # 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](/reference/complete-guide).