import type { LatticeConverters, Matrix3x3, Vec3 } from '../math';
import type { Pbc } from './pbc';
export type AngleMode = `degrees` | `radians`;
export declare const MAX_SELECTED_SITES = 8;
export declare function displacement_pbc(from: Vec3, to: Vec3, lattice_matrix: Matrix3x3 | null | undefined, converters?: LatticeConverters, pbc?: Pbc): Vec3;
export declare function distance_pbc(a: Vec3, b: Vec3, lattice_matrix: Matrix3x3, converters?: LatticeConverters, pbc?: Pbc): number;
export declare function angle_between_vectors(v1: Vec3, v2: Vec3, mode?: AngleMode): number;