Struct GeometryHasher 

pub struct GeometryHasher { /* private fields */ }

Accumulates a single entity’s geometry signature across one or more mesh segments. Segments are combined commutatively, so the order in which the kernel emits an entity’s pieces does not affect the result.

Implementations

impl GeometryHasher

pub fn new(tolerance: f64, rtc_offset: [f64; 3]) -> Self

Create a hasher for one entity.

• tolerance — quantization grid in metres (must be > 0).
• rtc_offset — the file’s RTC offset, added back to local positions to reconstruct world coordinates. Pass [0.0; 3] if positions are already in world space.

pub fn add_mesh(&mut self, positions: &[f32], indices: &[u32])

Add one mesh segment (a flat [x,y,z, ...] position buffer and a triangle index buffer). Indices that run past the position buffer or trailing non-triangle remainder are skipped defensively.

pub fn add_mesh_with_origin( &mut self, positions: &[f32], indices: &[u32], origin: [f64; 3], )

Like [add_mesh] but for positions stored in a per-element LOCAL frame: origin (the per-mesh AABB-centre origin) is folded back so the hash is over absolute world coordinates. This keeps the fingerprint identical whether the producer emitted absolute positions (native) or local + origin (the wasm local-frame path), and still detects element MOVES.

pub fn is_empty(&self) -> bool

true until at least one (non-degenerate, in-range) triangle has been hashed. Lets callers skip emitting a fingerprint for entities that produced no geometry.

pub fn finish(&self) -> u64

Finalize the entity’s geometry hash. Folds in the triangle count so two distinct shapes that happen to collide on the commutative triangle sum are still separated by their cardinality. Vertex count is intentionally excluded: it is ambiguous under shared-vs-duplicated vertices and under segment splitting (the same entity may arrive as one mesh or several sharing a position buffer), whereas the triangle count is intrinsic and additive across segments.

Trait Implementations

impl Clone for GeometryHasher

fn clone(&self) -> GeometryHasher

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GeometryHasher

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

Formats the value using the given formatter.