import * as THREE from 'three';
/**
 * Screen-space projection result from {@link projectToScreenUv}. Feed `u`/`v`
 * to effect uniforms and gate the effect on `onScreen`.
 */
export interface ScreenProjection {
    /** Screen position in 0..1 UV space (0,0 = bottom-left, matches shader vUv). */
    u: number;
    v: number;
    /** NDC depth; > 1 means beyond far plane, < -1 in front of near. */
    ndcZ: number;
    /** True when the point is in front of the camera and inside the 0..1 UV rect. */
    onScreen: boolean;
}
/**
 * Project an object's world position to 0..1 screen UV space for effect
 * targeting (lens flares, lensing, vortex centers). Points behind the camera
 * are detected in view space — a plain `Vector3.project()` folds them into
 * valid-looking NDC — and reported as `onScreen: false`.
 *
 * @param object - Object whose world position is projected; its world matrix must be current.
 * @param camera - Camera defining the projection.
 * @param out - Optional result object to fill; pass a reused one for zero per-frame allocation.
 * @returns The filled {@link ScreenProjection} (the same `out` instance when provided).
 */
export declare function projectToScreenUv(object: THREE.Object3D, camera: THREE.Camera, out?: ScreenProjection): ScreenProjection;
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