Struct BoundaryLoop 

pub struct BoundaryLoop {
    pub id: LoopId,
    pub vertices: Vec<VertexId>,
    pub perimeter: f64,
    pub area: f64,
    pub closed: bool,
    pub clean: bool,
}

A chain of boundary edges, closed unless the walk could not close it.

Fields

id: LoopId

The loop’s content fingerprint, which callers pass back to pick this loop (for example to fill it). It matches as long as the loop’s vertex sequence is unchanged, across edits and transactions.

vertices: Vec<VertexId>

The vertices in loop order. The loop runs along each boundary edge in the direction its one triangle uses it, so a hole in an outward-facing surface runs clockwise seen from outside. A closed loop starts at id.min_vertex and its polygon closes from the last vertex back to the first. An open chain runs from one end to the other, unrotated.

perimeter: f64

The length of the polygon closed from the last vertex back to the first, in local units (for an open chain, including that closing step).

area: f64

The vector area |sum p_i x p_(i+1)| / 2 of the same closed polygon.

closed: bool

true when the walk came back to its first edge. false for an open chain, which ends at a vertex where no boundary edge continues it (for example at a non-manifold edge). An open chain is never clean, so it is never filled.

clean: bool

false when the edges at some vertex of the loop could not be ordered by the fan walk: the vertex touches a non-manifold edge, or it is a pinch whose fan pieces are wound against each other, so the walk fell back to pairing by edge key. The loop may then be open or join openings that are not one hole. Also false when the loop crosses an orientation seam: it walks some boundary edge against its triangle’s direction, or it passes a vertex where outgoing and incoming boundary edges do not balance (a reversed triangle on the rim), so it may run backwards around its hole. This fails safe: unclean loops are skipped by fill_holes unless allowed, and orienting first makes a wound-against pinch or a flipped rim triangle clean.

Trait Implementations

impl Clone for BoundaryLoop

fn clone(&self) -> BoundaryLoop

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BoundaryLoop

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

Formats the value using the given formatter.

impl PartialEq for BoundaryLoop

fn eq(&self, other: &BoundaryLoop) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BoundaryLoop