import { Vector3 } from "./Vector3.ts";
/** Ray defined by an origin point and direction vector. */
export declare class Ray {
    #private;
    constructor(origin?: Vector3, direction?: Vector3);
    get origin(): Vector3;
    set origin(value: Vector3);
    get direction(): Vector3;
    set direction(value: Vector3);
    set(origin: Vector3, direction: Vector3): this;
    clone(): Ray;
    copy(ray: Ray): this;
    /** Returns the point at parameter t along the ray. */
    at(t: number, target?: Vector3): Vector3;
    /** Aims the ray direction toward v. */
    lookAt(v: Vector3): this;
    /** Moves the origin to the point at t and keeps the direction. */
    recast(t: number): this;
    closestPointToPoint(point: Vector3, target?: Vector3): Vector3;
    distanceToPoint(point: Vector3): number;
    distanceSqToPoint(point: Vector3): number;
    /** Squared distance from the ray to the closest point on a segment [v0,v1]. */
    distanceSqToSegment(v0: Vector3, v1: Vector3, optionalPointOnRay?: Vector3, optionalPointOnSegment?: Vector3): number;
    intersectSphere(sphere: {
        centre: Vector3;
        radius: number;
    }, target?: Vector3): Vector3 | undefined;
    intersectsSphere(sphere: {
        centre: Vector3;
        radius: number;
    }): boolean;
    intersectPlane(plane: {
        normal: Vector3;
        constant: number;
    }, target?: Vector3): Vector3 | undefined;
    intersectsPlane(plane: {
        normal: Vector3;
        constant: number;
    }): boolean;
    distanceToPlane(plane: {
        normal: Vector3;
        constant: number;
    }): number | undefined;
    intersectBox3(box: {
        min: Vector3;
        max: Vector3;
    }, target?: Vector3): Vector3 | undefined;
    intersectsBox3(box: {
        min: Vector3;
        max: Vector3;
    }): boolean;
    /** Moller-Trumbore ray-triangle intersection. */
    intersectTriangle(a: Vector3, b: Vector3, c: Vector3, backfaceCulling: boolean, target?: Vector3): Vector3 | undefined;
    applyMatrix4(matrix4: {
        elements: ArrayLike<number>;
    }): this;
    equals(ray: Ray): boolean;
}
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