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Can get the two dodecahedra which a face belongs to

feature-120-cell-index
Mike Lynch 2023-08-20 10:29:50 +10:00
parent 228d1a91c4
commit 32644b5d1e
1 changed files with 22 additions and 0 deletions
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22
testbed.js
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@ -295,6 +295,8 @@ function find_adjacent_faces(faces, face) {
}
function find_dodeca_mutuals(faces, f1, f2) {
// for any two adjacent faces, find their common neighbours where
// all three share exactly one vertex (this, I think, guarantees that
@ -360,6 +362,26 @@ function make_dodecahedron(faces, f1, f2) {
}
// for a face, pick an edge, and then find the other two faces which
// share this edge. These can be used as the starting points for the
// first face's two dodecahedra
function find_edge_neighbours(faces, face) {
const n1 = face.nodes[0];
const n2 = face.nodes[1];
return faces.filter((f) => f.id !== face.id && f.nodes.includes(n1) && f.nodes.includes(n2));
}
// each face is in two dodecahedra: this returns them both
function face_to_dodecahedra(faces, f) {
const edge_friends = find_edge_neighbours(faces, f);
const d1 = make_dodecahedron(faces, f, edge_friends[0]);
const d2 = make_dodecahedron(faces, f, edge_friends[1]);
return [ d1, d2 ];
}
const cell120 = () => {
const nodes = make_120cell_vertices();