Enum TessellationQuality 

pub enum TessellationQuality {
    Lowest,
    Low,
    Medium,
    High,
    Highest,
}

Detail level for geometry tessellation, selectable by consumers.

Levels map to a density multiplier (“angular deflection coefficient”) via density_factor. Medium reproduces the engine’s historical hardcoded behavior exactly and is the default.

Variants

Lowest

Coarsest — quarter density. Throughput / preview oriented.

Low

Half density.

Medium

Engine default. Byte-for-byte identical to pre-enum behavior.

High

Double density.

Highest

Finest — quadruple density. Minimizes faceting on curved models.

Implementations

impl TessellationQuality

pub fn label(self) -> &'static str

Stable lowercase label — the single string surface shared by the wasm setTessellationQuality setter and the server’s tessellation_quality query parameter, so the two consumer-facing spellings cannot drift.

pub fn parse_label(s: &str) -> Option<TessellationQuality>

Parse a consumer-facing label (case-insensitive). Inverse of label; None for unknown spellings.

pub fn to_index(self) -> u8

Dense 0-4 index (Lowest..Highest). Used by the wasm bindings to store the level in an atomic; total inverse of from_index.

pub fn from_index(idx: u8) -> TessellationQuality

Inverse of to_index; unknown values map to Medium.

pub fn density_factor(self) -> f64

Density multiplier applied to segment counts.

Medium == 1.0 is load-bearing: it guarantees scale_segments is the identity at the default level, so existing golden output never moves.

pub fn profile_arc_segments(self, base: usize, min: usize) -> usize

Segment count for a profile-plane arc / fillet (steel-section root fillets, rounded-rectangle corners, trimmed conics and polycurve arcs in arbitrary profiles), where base is the historical (often chord-adaptive) count and min is the floor.

Like circle_profile_segments these never get finer above Medium (denser caps only add earcut bridge slivers), but they coarsen proportionally below Medium so large channel/angle fillets stop dominating the triangle budget on preview levels (issue #976).

pub fn profile_fillet_radius(self, radius: f64) -> f64

Fillet / edge radius for a parametric steel-section corner, given the model’s declared radius.

Callers today are IfcI/L/U/TShapeProfileDef — the profiles whose builders actually read a radius attribute. IfcC/ZShapeProfileDef build plain sharp point lists and ignore their radius attributes entirely, so they never reach here; route them through this helper if that ever changes.

Below Medium the radius collapses to 0.0, so the corner is emitted sharp instead of as an arc: an I-section drops from ~28 outline vertices to its 12 sharp ones, halving the cross-section triangles on slender members where the fillet is a sub-pixel detail anyway (issue #1809). Medium and above return the radius untouched, keeping default output byte-identical — the same identity invariant as profile_arc_segments.

This only applies to parametric profiles swept by IfcExtrudedAreaSolid; faceted / tessellated exports have their fillets baked into the mesh.

pub fn circle_profile_segments(self, base: usize) -> usize

Segment count for a circular profile outline (opening cutter / cap), where base is the historical fixed count (e.g. 36 for IfcCircleProfileDef).

Profile circles deliberately do not get finer above Medium: denser opening circles only multiply the earcut cap-bridge slivers that show up as scar lines on plates with bolt holes (issue #976). They do get coarser below Medium for preview / throughput. The .min(base) guards tiny circles whose base is already below the coarse targets.

Trait Implementations

impl Clone for TessellationQuality

fn clone(&self) -> TessellationQuality

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TessellationQuality

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

Formats the value using the given formatter.

impl Default for TessellationQuality

fn default() -> TessellationQuality

Returns the “default value” for a type.

impl Hash for TessellationQuality

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TessellationQuality

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for TessellationQuality

impl Eq for TessellationQuality

impl StructuralPartialEq for TessellationQuality