Struct Curve 

pub struct Curve {
    pub kind: String,
    pub points: Vec<[f32; 3]>,
    pub closed: bool,
    pub tangents: Option<Vec<[[f32; 3]; 2]>>,
    pub up: Option<Vec<[f32; 3]>>,
}

core.curve: an author-placed curve in world space: a grind rail, a ledge, a coping, a path, a chairlift’s cable. Points in order, metres; closed: the last point joins the first. Without tangents it is the polyline through them; with them each pair of consecutive points is a cubic Bezier segment from a point by its out handle and the next point’s in handle (Catmull-Rom, Hermite and auto tangents convert to these handles exactly). A consumer that needs a polyline runs flatten-curves.

Fields

kind: String

As Marker::kind.

points: Vec<[f32; 3]>

closed: bool

tangents: Option<Vec<[[f32; 3]; 2]>>

Each point’s in and out handles, absolute positions.

up: Option<Vec<[f32; 3]>>

Each point’s up direction (a rail’s or a cable car’s roll), unit length.

Trait Implementations

impl Clone for Curve

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Component for Curve

const VERSION: u32 = 2

2: optional Bezier tangents and up per point.

fn apply_linear(&self, _l: &Linear) -> Linearity<Self>

World space: not in any entity’s local space.

fn verify(&self, _e: Entity, _w: &World) -> Result<(), String>

A valid kind and at least two finite points (three for a closed polyline, whose two would only retrace one segment; two Bezier segments do enclose a shape); handles and up directions, when given, one per point and finite (up directions of unit length within 1e-3).

const NAME: &'static str = "core.curve"

const GEOMETRY: Geometry = crate::Geometry::None

What the value holds of its entity’s mesh primitives and vertices (Geometry). Stated by every component, with no default, so data that describes a mesh can’t be left behind by an edit of it unawares: the World’s edit paths take it from there.

fn to_json(&self) -> Result<Option<Value>, JsonError>

The component as JSON, for glTF extras, the debug text form and golden tests; Ok(None) for components that are not shown (bulk data, handles). The view must never lose a value: components that can be shown derive serde::Serialize and return crate::json::to_value(self).map(Some), which refuses non-finite floats instead of writing them as null.

fn references(&self, _out: &mut Vec<Entity>)

The entities this component refers to (a prototype, materials, textures), appended to out: the edges World::closure follows. A component holding entity references must declare every one of them.

fn payload_bytes(&self) -> u64

The bytes of bulk payload the value holds (vertex streams and indices, texture levels, triangle soups), for memory reports: element counts times element sizes, not allocated capacity. 0 for small components.

fn remap_primitives(&self, _from: &[usize]) -> Option<Result<Self, String>>

The component after its entity’s mesh primitives were rebuilt, for a component that holds something per primitive (Geometry::PerPrimitive, Geometry::PerVertex): new primitive i comes from old primitive from[i] (a source may repeat, when a primitive is split, or be absent, when one is dropped). Such a component always answers (a value holding nothing per primitive answers with itself); None, the default, is for components of Geometry::None, and World::remap_primitives refuses a dependent component that gives it. An index the component does not have is an error. remap_list does the work for a list with one entry per primitive.

fn remap_vertices( &self, _primitive: usize, _from: &[u32], ) -> Option<Result<Self, String>>

The component after the vertices of its entity’s mesh primitive primitive were compacted or reordered, for a component that holds something per vertex (Geometry::PerVertex): new vertex i of that primitive is old vertex from[i] (a source may repeat or be absent). Such a component always answers (with itself when it holds nothing for that primitive); None, the default, is for the others, and World::remap_vertices refuses a per-vertex component that gives it. An index the component does not have is an error. Every pass that compacts or reorders a primitive’s vertices calls World::remap_vertices. After a rebuild of the primitive list (World::rebuild_primitives, Component::remap_primitives) a primitive’s per-vertex data is its source primitive’s, and the vertex map is relative to that source.

fn blend_vertices( &self, _primitive: usize, _from: &[VertexBlend], ) -> Option<Result<Self, String>>

The component after the vertices of its entity’s mesh primitive primitive were rebuilt as blends of old ones (VertexBlend), for a component that holds something per vertex (Geometry::PerVertex): new vertex i is the combination from[i] of old vertices, in whatever way the component’s data combines (a morph target’s delta is interpolated, the way the surface it moves is). It answers as Component::remap_vertices does: with itself when it holds nothing for that primitive; None, the default, is for a component that does not know how to combine its data, and World::blend_vertices refuses a per-vertex component that gives it. An index the component does not have is an error. A vertex that is a copy of one old vertex (VertexBlend::copy) is the case Component::remap_vertices states, and a component answering one answers the other alike.

fn restate(&self, _resolved: &Resolved<'_>) -> Restated<Self>

The component after resolve-state (crate::state::ResolveState) gave the axes in resolved their values: a component that holds crate::state::Clauses of its own (a record of parts each present in some states) reduces them as core.condition is reduced (crate::state::Resolved::reduce: a clause that fails is dropped, a clause left with no literal holds whatever the other axes are). Restated::Absent says the entity is not present in this state (every clause failed): it is despawned as one whose core.condition fails is. The default holds no clause: Restated::Unchanged.

impl Debug for Curve

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

Formats the value using the given formatter.

impl PartialEq for Curve

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Curve

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Curve