/**
 * Per-tile prism geometry — the building block of the merged hex mesh.
 *
 * Each vertex is extruded along its own radial direction (normalized per
 * vertex). This keeps the top face flat and produces perfectly-matched
 * edges between neighbouring tiles — essential for the hex mesh to seal
 * without seams.
 */
import * as THREE from 'three';
import type { Tile } from '../../geometry/hexasphere.types';
/**
 * Builds a single-tile hex prism. Top cap sits at `+height` above the
 * sphere surface; the walls can start below via a negative `basement`
 * (used to reach a common sea-floor level so the hex grid seals the
 * shoreline even when the ocean layer is hidden).
 */
export declare function buildPrismGeometry(tile: Tile, height: number, basement?: number): THREE.BufferGeometry;
/**
 * Builds only the top fan of a hex prism — same vertex layout as the top
 * fan of {@link buildPrismGeometry} (n × 3 vertices, fan from `centerPoint`),
 * but no walls. Used by the liquid shell where the cap is a flat surface
 * sitting at the waterline (no underwater "column" to draw).
 */
export declare function buildPrismTopFanGeometry(tile: Tile, height: number): THREE.BufferGeometry;
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