import { BufferGeometry, Object3D } from "three";
export declare const isSSR: boolean;
/**
 * The raycast mesh is a low poly version of the mesh used for raycasting. It is set when a mesh that has LOD level with more vertices is discovered for the first time
 * @param obj the object to get the raycast mesh from
 * @returns the raycast mesh or null if not set
 */
export declare function getRaycastMesh(obj: Object3D): BufferGeometry<any> | null;
/**
 * Set the raycast mesh for an object.
 * The raycast mesh is a low poly version of the mesh used for raycasting. It is set when a mesh that has LOD level with more vertices is discovered for the first time
 * @param obj the object to set the raycast mesh for
 * @param geom the raycast mesh
 */
export declare function registerRaycastMesh(obj: Object3D, geom: BufferGeometry): void;
/**
 * Call this method to enable raycasting with the lowpoly raycast meshes (if available) for all meshes in the scene.
 * This is useful for performance optimization when the scene contains high poly meshes that are not visible to the camera.
 * @example
 * ```ts
 * // call to enable raycasting with low poly raycast meshes
 * useRaycastMeshes();
 *
 * // then use the raycaster as usual
 * const raycaster = new Raycaster();
 * raycaster.setFromCamera(mouse, camera);
 * const intersects = raycaster.intersectObjects(scene.children, true);
 * ```
 */
export declare function useRaycastMeshes(enabled?: boolean): void;