import type { Vec3 } from "../packages/openplans-core/src/types";
/** Add two Vec3s. */
export declare function add(a: Vec3, b: Vec3): Vec3;
/** Subtract b from a. */
export declare function sub(a: Vec3, b: Vec3): Vec3;
/** Scale a Vec3 by a scalar. */
export declare function scale(a: Vec3, s: number): Vec3;
/** Translate every point by `delta`. Returns a new array; does not mutate. */
export declare function translatePoints(points: Vec3[], delta: Vec3): Vec3[];
/** Rodrigues rotation: rotate `point` by `angleRad` around an arbitrary unit
 *  `axis` pivoted at `anchor`. Pure function — does not mutate inputs. */
export declare function rotatePoint(point: Vec3, angleRad: number, axis: Vec3, anchor: Vec3): Vec3;
/** Rotate every point. Returns a new array. */
export declare function rotatePoints(points: Vec3[], angleRad: number, axis: Vec3, anchor: Vec3): Vec3[];
/** Centroid of a point cloud. Returns [0,0,0] for empty input. */
export declare function centroid(points: Vec3[]): Vec3;
/** Convert degrees to radians. */
export declare function degToRad(deg: number): number;
/** Default rotation axis (Y-up, the typical "yaw" axis for AEC plans). */
export declare const Y_UP: Vec3;