import { Plane } from "./Plane.ts";
import { Vector3 } from "./Vector3.ts";
/** Triangle defined by three 3D vertices. */
export declare class Triangle {
    #private;
    constructor(a?: Vector3, b?: Vector3, c?: Vector3);
    get a(): Vector3;
    set a(value: Vector3);
    get b(): Vector3;
    set b(value: Vector3);
    get c(): Vector3;
    set c(value: Vector3);
    set(a: Vector3, b: Vector3, c: Vector3): this;
    clone(): Triangle;
    copy(triangle: Triangle): this;
    getArea(): number;
    /**
     * Computes barycentric coordinates of point relative to triangle (a, b, c).
     * Returns undefined if point is not coplanar or triangle is degenerate.
     */
    static getBarycoord(point: Vector3, a: Vector3, b: Vector3, c: Vector3, target?: Vector3): Vector3 | undefined;
    getBarycoord(point: Vector3, target?: Vector3): Vector3 | undefined;
    static containsPoint(point: Vector3, a: Vector3, b: Vector3, c: Vector3): boolean;
    containsPoint(point: Vector3): boolean;
    closestPointToPoint(point: Vector3, target?: Vector3): Vector3;
    equals(triangle: Triangle): boolean;
    /** Interpolates v1, v2, v3 at the barycentric coordinate of point in triangle (a,b,c). */
    static getInterpolation(point: Vector3, a: Vector3, b: Vector3, c: Vector3, v1: Vector3, v2: Vector3, v3: Vector3, target?: Vector3): Vector3 | undefined;
    getInterpolation(point: Vector3, v1: Vector3, v2: Vector3, v3: Vector3, target?: Vector3): Vector3 | undefined;
    getMidpoint(target?: Vector3): Vector3;
    /** Computes the normal of triangle (a, b, c) into target. */
    static getNormal(a: Vector3, b: Vector3, c: Vector3, target?: Vector3): Vector3;
    getNormal(target?: Vector3): Vector3;
    getPlane(target?: Plane): Plane;
    intersectsBox(box: {
        min: Vector3;
        max: Vector3;
        intersectsTriangle?: (tri: Triangle) => boolean;
    }): boolean;
    /** Returns true if triangle (a,b,c) is front-facing relative to direction. */
    static isFrontFacing(a: Vector3, b: Vector3, c: Vector3, direction: Vector3): boolean;
    isFrontFacing(direction: Vector3): boolean;
}
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