/**
 * VTKExporter — Export simulation results in VTK Legacy ASCII format.
 *
 * Supported output types:
 * - Structured Points (RegularGrid3D scalar fields → thermal)
 * - Unstructured Grid (tetrahedral mesh → structural FEM)
 * - PolyData (line segments → hydraulic pipe networks)
 *
 * Output files can be opened directly in ParaView, VisIt, or any
 * VTK-compatible post-processing tool.
 *
 * Reference: VTK File Formats (Kitware), https://vtk.org/wp-content/uploads/2015/04/file-formats.pdf
 */
import type { RegularGrid3D } from '../RegularGrid3D';
export interface StructuredPointsOptions {
    /** Dataset title (appears in VTK header) */
    title?: string;
    /** Scalar field name (e.g., "Temperature") */
    fieldName?: string;
    /** Physical unit string for documentation (e.g., "K") */
    unit?: string;
}
/**
 * Export a RegularGrid3D scalar field as VTK Structured Points.
 * Suitable for thermal temperature fields, saturation fields, etc.
 */
export declare function exportStructuredPoints(grid: RegularGrid3D, data: Float32Array, options?: StructuredPointsOptions): string;
export interface UnstructuredGridOptions {
    title?: string;
    /** Names for point data arrays */
    pointDataNames?: string[];
    /** Names for cell data arrays */
    cellDataNames?: string[];
}
/**
 * Export a tetrahedral mesh with results as VTK Unstructured Grid.
 * Suitable for structural FEM results (displacements, Von Mises stress).
 *
 * @param nodes     Node coordinates [x0,y0,z0, x1,y1,z1, ...]
 * @param elements  Element connectivity [n0,n1,n2,n3, ...] (4 nodes per tet)
 * @param pointData Per-node scalar/vector arrays (e.g., displacements)
 * @param cellData  Per-element scalar arrays (e.g., Von Mises stress)
 */
export declare function exportUnstructuredGrid(nodes: Float32Array | Float64Array, elements: Uint32Array | number[], pointData: {
    name: string;
    data: Float32Array | Float64Array;
    components: number;
}[], cellData: {
    name: string;
    data: Float32Array | Float64Array;
}[], options?: UnstructuredGridOptions): string;
/**
 * Export a pipe network as VTK PolyData (lines with scalar data).
 * Suitable for hydraulic solver results (pressure, flow rate).
 *
 * @param nodePositions  Node coordinates [x0,y0,z0, ...]
 * @param pipes          Pipe connectivity [startNode, endNode] pairs
 * @param nodeData       Per-node scalar arrays (e.g., pressure head)
 * @param pipeData       Per-pipe scalar arrays (e.g., flow rate)
 */
export declare function exportPolyData(nodePositions: Float32Array | Float64Array | number[], pipes: [number, number][], nodeData: {
    name: string;
    data: Float32Array | Float64Array | number[];
}[], pipeData: {
    name: string;
    data: Float32Array | Float64Array | number[];
}[], options?: {
    title?: string;
}): string;
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