Link Search Menu Expand Document
OCCTSwiftIO

Formats

Format Read Write Product Backend
STL (ascii + binary) ✅ ✅ MeshIO native
OBJ ✅ ✅ MeshIO native
PLY (ascii + binary-LE) ✅ ✅ MeshIO native
glTF / GLB ✅ ✅ MeshIO SwiftGLTF (read) + native (write)
3MF ✅ ✅ MeshIO ThreeMF
PMX (MikuMikuDance) ✅ — MeshIO SwiftPMX
DirectX .x ✅ — MeshIO SwiftX
STEP / IGES / BREP ✅ ✅ OCCTSwiftIO OCCT
JWW (Jw_cad, 2D vector) ✅ — OCCTSwiftIO SwiftJWW → OCCT edges

Notes

Mesh formats (MeshIO)

  • Welding. Readers weld coincident vertices (weldEpsilon, default 1e-4) so connectivity is restored in formats that split vertices at seams.
  • PMX / .x are source formats (game / 3D-model assets) — read-only. They carry no canonical units; consumers may need to scale.
  • glTF / GLB read delegates the hard decode (JSON/GLB container, buffers, external .bin, accessors) to SwiftGLTF; node transforms are baked. Write is a native minimal glTF/GLB (positions + indices → one buffer; .glb binary or self-contained .gltf with a base64 buffer).
  • 3MF reads ThreeMF’s flattened model (build items expanded into placed mesh instances) and writes a single-object package.

CAD & vector (OCCTSwiftIO)

  • STEP / IGES / BREP load to OCCT Shapes with per-shape colors and AP242 dimensions / datums.
  • JWW is a 2D vector drawing, not a mesh or solid. It loads to a single compound Shape of OCCT edges: lines → line edges, arcs/circles → circular-arc edges (the JWW tilt axis is honoured), ellipses → polyline approximations, points → vertices. Coordinates lie in the Z = 0 plane. Text is not converted to geometry (it would need font outlines), and block inserts are not yet expanded.

Export (OCCTSwiftIO)

ExportManager.export(shapes:format:to:) writes OCCT Shapes to OBJ / PLY / STEP / BREP / glTF / GLB. For pure-mesh output without the kernel, prefer MeshIO.write.