import * as THREE from 'three';
import { type BodyHoverConfig } from '../../config/render';
/**
 * Runtime handle returned by {@link buildBodyHoverOverlay}. Controls the
 * visibility of the selection ring and releases its GPU resources.
 */
export interface BodyHoverOverlay {
    /**
     * Underlying ring mesh. Exposed so the body's `warmup` can include the
     * overlay shader in its compile pass; the mesh is mounted in the body
     * group at construction time, callers should not re-parent it.
     */
    mesh: THREE.Mesh;
    /** Show or hide the ring. */
    setVisible(visible: boolean): void;
    /** Remove mesh from parent group and release GPU resources. */
    dispose(): void;
}
/**
 * Builds a selection ring for a celestial body that matches the sphere's
 * perspective-projected silhouette exactly.
 *
 * The ring is placed on the sphere's silhouette plane each frame:
 *   - Center: sphere_center + shift toward camera = P*(1 - r²/d²)
 *   - Radius: r * sqrt(1 - r²/d²)
 *   - Normal: camera→sphere direction
 *
 * This makes the ring distort identically to the sphere mesh under perspective
 * projection, eliminating any shape/position mismatch.
 *
 * `cfg.ringMarginPx` and `cfg.ringWidthPx` remain constant in screen pixels
 * at any zoom level.
 *
 * @param group  - The body's THREE.Group.
 * @param radius - Body radius in world units.
 * @param cfg    - Visual parameters.
 */
export declare function buildBodyHoverOverlay(group: THREE.Group, radius: number, cfg?: BodyHoverConfig): BodyHoverOverlay;
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