CADBodyMetadata

CADBodyMetadata is a pure-data record produced by the bridge layer (OCCTSwiftTools) for sub-body selection — face / edge / vertex picking. It lives in OCCTSwiftIO so the type itself doesn’t pull in OCCTSwiftViewport: the bridge consumes it, but doesn’t need Viewport types to express it.

Topics

• CADBodyMetadata · CADBodyMetadata.init(faceIndices:edgePolylines:vertices:measurements:)

CADBodyMetadata

public struct CADBodyMetadata: Sendable {
    /// Per-triangle source-face index (parallel to the mesh's triangle list).
    public let faceIndices: [Int32]

    /// Edge polylines tagged with their source-edge index.
    public let edgePolylines: [(edgeIndex: Int, points: [SIMD3<Float>])]

    /// Source-shape vertex positions, indexed parallel to `shape.vertices()`.
    public let vertices: [SIMD3<Float>]

    /// Optional per-face area + per-edge length report. Populated only when the
    /// bridge passes `includeMeasurements: true`.
    public let measurements: ShapeMeasurements?
}

• faceIndices — one entry per triangle of a triangulated mesh, value = source-face index.
• edgePolylines — gives the picking layer enough to round-trip a GPU pick back to a TopoDS_Edge via shape.edge(at:).
• vertices — source-shape vertex positions, parallel to shape.vertices() for shape.vertex(at:).
• measurements — optional ShapeMeasurements (from OCCTSwift); populated only when measurements were requested. Used by AIS’ dimension widget to label picked faces/edges.

CADBodyMetadata.init(faceIndices:edgePolylines:vertices:measurements:)

public init(
    faceIndices: [Int32],
    edgePolylines: [(edgeIndex: Int, points: [SIMD3<Float>])],
    vertices: [SIMD3<Float>],
    measurements: ShapeMeasurements? = nil
)

• Parameters: the four stored properties above; measurements defaults to nil.