Struct ProducedElementMeshes 

pub struct ProducedElementMeshes {
    pub meshes: Vec<MeshData>,
    pub instance_occurrences: Vec<RawInstanceOccurrence>,
    pub geometry_hash: Option<u64>,
    pub csg_failures: FxHashMap<u32, Vec<BoolFailure>>,
    pub degenerate_triangles_dropped: u64,
}

Everything one element produced.

Fields

meshes: Vec<MeshData>

instance_occurrences: Vec<RawInstanceOccurrence>

#1623 Phase 2 don’t-bake output: this element’s occurrences of a repeated IfcRepresentationMap that skipped the per-occurrence materialize. Empty unless the router was armed with an instancing plan (GeometryRouter::enable_output_instancing); the streaming finalize resolves each into a crate::InstanceRecord against the shared template MeshData.

geometry_hash: Option<u64>

Per-ELEMENT fingerprint, accumulated across all of the element’s meshes in the native IFC frame (pre-split, pre-site-rotation). None when hashing is off, nothing was produced, or the job is a TypeProduct.

csg_failures: FxHashMap<u32, Vec<BoolFailure>>

CSG diagnostics recorded while producing THIS element, attributed by product id. The router is fully drained on return, so a warm router reused across a batch never leaks one element’s failures into the next. Failures from a superseded strategy (a fallback re-attempting the same cuts) are discarded — only the path that produced the returned meshes contributes.

degenerate_triangles_dropped: u64

Triangles dropped by the f32-collapse degenerate-triangle backstop (drop_degenerate_triangles in build_mesh_data) across ALL of this element’s meshes. Zero when the backstop is disabled or nothing was degenerate. Request-local (scoped per produce_element_meshes call) so concurrent passes never cross-contaminate.