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Interface: InitialTriangulation

Defined in: delatin.ts:58

A seed triangulation for RasterReprojector, in delaunator's data shape. All UV coordinates must lie in [0, 1]. The triangulation must be a valid (ideally Delaunay) mesh — its triangles are NOT legalized on seeding.

The fields deliberately match delaunator's output, so building a seed from a set of UV points is a one-liner — pass the points (which must form a convex domain; delaunator triangulates the convex hull of its input):

import Delaunator from "delaunator";

const points: [number, number][] = [[0, 0], [1, 0], [0, 1], [1, 1]];
const d = Delaunator.from(points);
const seed: InitialTriangulation = {
  uvs: Array.from(d.coords),
  triangles: Array.from(d.triangles),
  halfedges: Array.from(d.halfedges),
};

delaunator is not a dependency of this package; consumers that want this convenience add it themselves. A hand-built triangulation works too, as long as it is a valid mesh with the halfedge convention below.

Properties​

halfedges​

halfedges: number[]

Defined in: delatin.ts:68

Halfedge twins: halfedges[e] is the opposite halfedge of e, or -1 if e is on the boundary. Same convention as delaunator and the reprojector's internal _halfedges.

triangles​

triangles: number[]

Defined in: delatin.ts:62

Triangle vertex indices, 3 per triangle (indices into uvs).

uvs​

uvs: number[]

Defined in: delatin.ts:60

Flat UV vertex coordinates [u0, v0, u1, v1, ...], each in [0, 1].