export declare class Vector3 {
    x: number;
    y: number;
    z: number;
    constructor(x?: number, y?: number, z?: number);
    set(x: number, y: number, z: number): void;
    add(v: Vector3): void;
    sub(v: Vector3): void;
    dot(v: Vector3): number;
    addVectors(a: Vector3, b: Vector3): Vector3;
    subVectors(a: Vector3, b: Vector3): Vector3;
}