/**
 * Shared grid mesh + normal utilities for the page-curl models.
 *
 * A curl model fills `positions`/`normals` in place each frame; UVs are static grid
 * coordinates (no texture swimming). All models bend the same (cols+1)×(rows+1) grid.
 */
export interface PageMesh {
    readonly cols: number;
    readonly rows: number;
    /** ((cols+1)*(rows+1))*2 — static grid UVs (u across width, v down height). */
    readonly uvs: Float32Array;
    /** *3 — deformed positions, updated by the curl model. */
    readonly positions: Float32Array;
    /** *3 — per-vertex normals, updated by the curl model. */
    readonly normals: Float32Array;
}
/** Allocate a (cols+1)×(rows+1) grid mesh with static UVs (positions/normals filled by a curl). */
export declare function createPageMesh(cols: number, rows: number): PageMesh;
/** Per-vertex normals from central differences of the deformed grid (front = +z when flat). */
export declare function computeNormals(mesh: PageMesh): void;