Exporting shapes

ExportManager writes OCCT Shapes to mesh, B-Rep, and glTF formats. It is async throws and takes an array of shapes, an ExportFormat, and a destination URL.

The six formats

public enum ExportFormat: String, CaseIterable, Sendable {
    case obj, ply, step, brep, gltf, glb
    public var fileExtension: String { /* "obj", "ply", "step", "brep", "gltf", "glb" */ }
}

obj / ply / gltf / glb are meshed exports (controlled by deflection); step / brep write exact B-Rep.

Export a single shape

import OCCTSwift
import OCCTSwiftIO

try await ExportManager.export(shapes: [shape], format: .step, to: stepURL)

// glTF/GLB and OBJ/PLY honour the meshing deflection (default 0.1, smaller = finer):
try await ExportManager.export(shapes: [shape], format: .glb, to: glbURL, deflection: 0.05)

Multiple shapes

When you pass more than one shape, ExportManager writes one file per shape, inserting the index before the extension (out.0.step, out.1.step, …). A single-element array writes the exact url you gave:

let result = try await ShapeLoader.load(from: stepURL, format: .step)
// result.shapes.count files: out.0.obj, out.1.obj, ...
try await ExportManager.export(shapes: result.shapes, format: .obj, to: URL(fileURLWithPath: "out.obj"))

An empty shapes array is a no-op.

Mesh-only output without the kernel

If you already have a Mesh (or only need a mesh on disk), prefer MeshIO.write — it has no OCCT dependency. ExportManager is for exporting B-Rep Shapes, including the exact STEP / BREP paths.