Struct TriangleMesh

pub struct TriangleMesh {
    pub positions: Vec<Vec3>,
    pub indices: Vec<u32>,
    pub face_normals: Vec<Vec3>,
}

An indexed triangle mesh in the node’s local coordinates.

Positions are f64; see crate::math for why.

Fields

positions: Vec<Vec3>

Vertex positions, from points.

indices: Vec<u32>

Three indices into positions per triangle, from faceVertexIndices. Every index is in range.

face_normals: Vec<Vec3>

One unit normal per triangle, (b - a) × (c - a) normalised, so face_normals.len() == indices.len() / 3. Degenerate triangles get a zero vector. Renderers that want flat shading duplicate vertices per face and use these.

Implementations

impl TriangleMesh

pub fn from_attribute(value: &Value) -> Result<Self, DecodeError>

Decodes the value of a ATTRIBUTE (usd::usdgeom::mesh) attribute.

use openbim_ifcx_geometry::mesh::TriangleMesh;

let value = serde_json::json!({
    "points": [[0, 0, 0], [1, 0, 0], [0, 1, 0]],
    "faceVertexIndices": [0, 1, 2]
});
let mesh = TriangleMesh::from_attribute(&value)?;
assert_eq!(mesh.triangle_count(), 1);
assert_eq!(mesh.face_normals[0], [0.0, 0.0, 1.0]);

pub fn new(positions: Vec<Vec3>, indices: Vec<u32>) -> Result<Self, DecodeError>

Builds a mesh from positions and triangle indices, checking the indices and computing face normals.

pub fn triangle_count(&self) -> usize

Number of triangles.

pub fn triangles(&self) -> impl Iterator<Item = [u32; 3]> + '_

Triangles as index triples.

Trait Implementations

impl Clone for TriangleMesh

fn clone(&self) -> TriangleMesh

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TriangleMesh

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

Formats the value using the given formatter.

impl PartialEq for TriangleMesh

fn eq(&self, other: &TriangleMesh) -> 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 StructuralPartialEq for TriangleMesh