@woosh/meep-engine/src/core/geom/3d/tetrahedra/is_tetrahedron_degenerate.js

Pure JavaScript game engine. Fully featured and production ready.

/**
 * Vertices must be unique inside a single tetrahedron, that is - no repetitions are allowed
 * If vertices are repeated - volume will be 0 and tetrahedron will be degenerate
 * @param {TetrahedralMesh} mesh
 * @param {number} tet
 * @returns {boolean}
 */
export function is_tetrahedron_degenerate(mesh, tet) {

    for (let i0 = 0; i0 < 4; i0++) {
        const v0 = mesh.getVertexIndex(tet, i0);
        for (let i1 = i0 + 1; i1 < 4; i1++) {
            if (v0 === mesh.getVertexIndex(tet, i1)) {
                // identical vertices
                return true;
            }
        }
    }

    return false;
}