import type { Box3 } from './Box3';
import type { Matrix4 } from './Matrix4';
import type { Sphere } from './Sphere';
import { Vector3 } from './Vector3';
declare class Ray {
    readonly isRay = true;
    origin: Vector3;
    direction: Vector3;
    constructor(origin?: Vector3, direction?: Vector3);
    set(origin: Vector3, direction: Vector3): this;
    copy(ray: Ray): this;
    at(t: number, target?: Vector3): Vector3;
    lookAt(v: Vector3): this;
    recast(t: number): this;
    closestPointToPoint(point: Vector3, target?: Vector3): Vector3;
    distanceToPoint(point: Vector3): number;
    distanceSqToPoint(point: Vector3): number;
    distanceSqToSegment(v0: Vector3, v1: Vector3, optionalPointOnRay: Vector3, optionalPointOnSegment: Vector3): number;
    intersectSphere(sphere: Sphere, target: Vector3): Vector3 | null;
    intersectsSphere(sphere: Sphere): boolean;
    intersectBox(box: Box3, target: Vector3): Vector3 | null;
    intersectsBox(box: Box3): boolean;
    intersectTriangle(a: Vector3, b: Vector3, c: Vector3, backfaceCulling: boolean, target: Vector3): Vector3 | null;
    applyMatrix4(matrix4: Matrix4): this;
    equals(ray: Ray): boolean;
    clone(): Ray;
}
export { Ray };