Struct StepOccurrence 

pub struct StepOccurrence {
    pub edge_ref: usize,
    pub parent: usize,
    pub child: usize,
    pub designator: String,
    pub placement: [f64; 16],
    pub rigid: bool,
}

One occurrence: a placement of child inside parent, from a NAUO edge or a mapped item.

Fields

edge_ref: usize

The entity that IS this occurrence: a NEXT_ASSEMBLY_USAGE_OCCURRENCE, or the MAPPED_ITEM that placed a shared representation (mapped.rs). Part 21 ids are unique per file, so this identifies the occurrence either way, and consumers order sibling occurrences by it for determinism.

parent: usize

Index into StepAssembly::products.

child: usize

Index into StepAssembly::products.

designator: String

The instance label (“bolt-3”) — see edge_designator for which of a NAUO’s several label attributes wins, and what a mapped item contributes.

placement: [f64; 16]

child-local → parent-local, row-major affine, translations in MILLIMETRES (scaled by the PARENT representation’s unit, which is the frame the placement is expressed in). NOT a world transform: the caller composes these down from StepAssembly::roots.

rigid: bool

RᵀR = I and det R = +1 within 1e-9 — i.e. the placement is a pure rotation + translation, representable as a translate/rotate component pose. A mirrored or scaled occurrence has no such representation and its non-rigid factor must be baked into a distinct part by the caller, which is what BREP_render’s assembly intake does. A MAPPED_ITEM through a CARTESIAN_TRANSFORMATION_OPERATOR_3D is the placement that makes this false today (mapped.rs).

Trait Implementations

impl Clone for StepOccurrence

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StepOccurrence

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for StepOccurrence

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for StepOccurrence

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.