import { Group, Camera } from 'three';
export interface CaptureSnapshotOptions {
    /** Height resolution in pixels (width is computed from camera aspect ratio) */
    height?: number;
    /** Whether to download the image automatically */
    download?: boolean;
    /** Filename for download (without extension) */
    filename?: string;
}
/**
 * Hook to capture high-resolution snapshots from virtual cameras.
 *
 * This hook provides two methods for capturing snapshots:
 * 1. captureByKey - Capture from a registered virtual camera by its key
 * 2. captureCamera - Capture directly from any Camera object
 *
 * Both methods use temporary SparkViewpoint for rendering, which supports
 * 3DGS (Gaussian Splatting) content. For fisheye cameras, a special
 * cubemap-based rendering pipeline is used.
 *
 * @example
 * const { captureByKey, captureCamera } = useCameraSnapshot();
 *
 * // Capture from registered camera
 * const blob = await captureByKey('cam1', groupRef, { height: 1080, download: true });
 *
 * // Capture from any camera object
 * const blob = await captureCamera(myCamera, { height: 2160 });
 */
export declare function useCameraSnapshot(): {
    captureByKey: (cameraKey: string, groupRef: React.RefObject<Group>, options?: CaptureSnapshotOptions) => Promise<Blob | null>;
    captureCamera: (camera: Camera, options?: CaptureSnapshotOptions & {
        aspect?: number;
    }) => Promise<Blob | null>;
};