import { type PerspectiveCamera } from 'three';
/**
 * Pointer→scene unprojection for click-on-sphere authoring (WS-SP).
 *
 * The camera sits at the origin looking at the inside of the projection
 * sphere, so a viewport point unprojects to a world-space ray direction whose
 * spherical angles ARE the scene lat/lon — the exact inverse of the sprite
 * placement mapping `(sinφcosθ, cosφ, sinφsinθ)` used by annotations,
 * hotspots, and tour portals.
 */
export declare function pointerToLatLon(camera: PerspectiveCamera, container: HTMLElement, clientX: number, clientY: number): {
    lat: number;
    lon: number;
};
/**
 * Drag-threshold click discrimination sharing the container with the camera
 * pan gesture: only a down→click pair with less than a few px of travel fires.
 * Listens on the browser-synthesized `click` (not `pointerup`) so any UI a
 * consumer mounts in response cannot swallow the tail of the same gesture —
 * firing on pointerup made a freshly-opened modal receive the synthesized
 * click and immediately dismiss itself. The camera controller owns pointer
 * capture/panning; this only observes.
 */
export declare class SceneClickTracker {
    private container;
    private downX;
    private downY;
    private onDown;
    private onNativeClick;
    constructor(container: HTMLElement, onClick: (clientX: number, clientY: number) => void);
    dispose(): void;
}
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