/**
 * Minimal Vec3 utilities for 3D math.
 * No external dependencies.
 */
export type Vec3 = [number, number, number];
/** Create a new Vec3 */
export declare function create(x?: number, y?: number, z?: number): Vec3;
/** Clone a Vec3 */
export declare function clone(a: Vec3): Vec3;
/** Copy Vec3 a to out */
export declare function copy(out: Vec3, a: Vec3): Vec3;
/** Set Vec3 values */
export declare function set(out: Vec3, x: number, y: number, z: number): Vec3;
/** Add two Vec3: out = a + b */
export declare function add(out: Vec3, a: Vec3, b: Vec3): Vec3;
/** Subtract two Vec3: out = a - b */
export declare function subtract(out: Vec3, a: Vec3, b: Vec3): Vec3;
/** Scale Vec3: out = a * scalar */
export declare function scale(out: Vec3, a: Vec3, s: number): Vec3;
/** Normalize Vec3 */
export declare function normalize(out: Vec3, a: Vec3): Vec3;
/** Dot product of two Vec3 */
export declare function dot(a: Vec3, b: Vec3): number;
/** Cross product: out = a × b */
export declare function cross(out: Vec3, a: Vec3, b: Vec3): Vec3;
/** Length of Vec3 */
export declare function length(a: Vec3): number;
/** Squared length of Vec3 */
export declare function squaredLength(a: Vec3): number;
/** Distance between two Vec3 */
export declare function distance(a: Vec3, b: Vec3): number;
/** Linear interpolation: out = a + t * (b - a) */
export declare function lerp(out: Vec3, a: Vec3, b: Vec3, t: number): Vec3;
/** Negate Vec3: out = -a */
export declare function negate(out: Vec3, a: Vec3): Vec3;
/** Transform Vec3 by Mat4 (assumes w=1) */
export declare function transformMat4(out: Vec3, a: Vec3, m: Float32Array): Vec3;