/** Isometric projection for 3D surface charts */
export declare function project3d(x: number, y: number, z: number, cx: number, cy: number, scale?: number): [number, number];
export declare function surfaceMeshPath(zGrid: number[][], cx: number, cy: number, cellSize?: number): string[];
export declare function wireframePaths(zGrid: number[][], cx: number, cy: number, cellSize?: number): string[];
export declare function sampleZGrid(size?: number): number[][];