/**
 * Pure geometry math utilities for snap detection.
 *
 * All functions are stateless and operate on Vec3 coordinates.
 */
import type { Vec3 } from './raycaster.js';
/**
 * Euclidean distance between two points.
 */
export declare function distance(a: Vec3, b: Vec3): number;
/**
 * Check if two vectors are approximately equal.
 */
export declare function vecEquals(a: Vec3, b: Vec3, epsilon?: number): boolean;
/**
 * Get closest point on an edge segment with parameter t (0-1).
 */
export declare function closestPointOnEdgeWithT(point: Vec3, v0: Vec3, v1: Vec3): {
    point: Vec3;
    distance: number;
    t: number;
};
/**
 * Convert a screen-space radius (pixels) to a world-space radius at `dist`.
 *
 * `fov` is the vertical field of view in RADIANS — matching `Camera.getFOV()`,
 * which is the only source of this value (the snap detector passes it straight
 * through). It used to apply a degrees→radians conversion here, but the camera
 * already supplies radians, so that shrank every snap radius by ~57× (tan of a
 * 57×-too-small angle) — snap then needed sub-millimetre precision and fell back
 * to face hits on anything but a near-perfect cursor, e.g. small bolts.
 */
export declare function screenToWorldRadius(screenRadius: number, dist: number, fov: number, screenHeight: number): number;
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