/**
 * Tile-level geometry primitives used by hover overlays and external
 * overlay renderers. Pure builders — no THREE.Mesh allocation, only
 * ready-to-upload `Float32Array` position buffers.
 */
import * as THREE from 'three';
import type { Tile } from '../../geometry/hexasphere.types';
/**
 * Computes the expanded top-face ring for a hovered tile.
 *
 * The ring is slightly lifted above the tile surface (`surfaceOffset`)
 * and expanded outward (`ringExpand`) so it visually frames the tile.
 */
export declare function buildTileRing(tile: Tile, height: number, surfaceOffset: number, ringExpand: number): {
    center: THREE.Vector3;
    ring: THREE.Vector3[];
    avgRadius: number;
};
/**
 * Builds the fill fan geometry: triangles from center to each boundary edge.
 * Used with additive blending for a soft glow overlay on the tile top face.
 */
export declare function buildFillPositions(center: THREE.Vector3, ring: THREE.Vector3[]): Float32Array;
/**
 * Builds the border quad-strip geometry: a thin perimeter band inset from
 * the outer ring toward the tile center by `borderWidth` fraction of
 * `avgRadius`. Each edge becomes two triangles (one quad).
 */
export declare function buildBorderPositions(center: THREE.Vector3, ring: THREE.Vector3[], avgRadius: number, borderWidth: number): Float32Array;
/**
 * Builds a vertical quad-strip running along the outside wall of the tile
 * from the top edge down to `depthWorld` below (in world units). Produces
 * one quad per boundary edge, so the strip wraps all 6 wall faces of the
 * hex prism.
 *
 * Used to continue the top-face border over the hex walls so the outline
 * stays visible when the tile is viewed from a grazing angle.
 */
export declare function buildSideBorderPositions(tile: Tile, height: number, surfaceOffset: number, depthWorld: number): Float32Array;
/**
 * Creates the border overlay material for the hovered tile.
 * Additive blending with high brightness seeds the bloom / hover rays pass.
 */
export declare function makeBorderMaterial(): THREE.MeshBasicMaterial;
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