/**
 * TerrainPaintLayer — Splat map layers for terrain texturing
 *
 * Manages per-vertex paint weights across multiple texture layers
 * with blending, undo, and normalization.
 *
 * @version 1.0.0
 */
export interface PaintLayer {
    id: string;
    name: string;
    textureId: string;
    tiling: number;
    metallic: number;
    roughness: number;
}
export interface VertexWeights {
    weights: number[];
}
export declare class TerrainPaintLayer {
    private layers;
    private splatMap;
    private gridSize;
    private undoStack;
    constructor(gridSize?: number);
    /**
     * Add a texture layer
     */
    addLayer(layer: PaintLayer): number;
    /**
     * Remove a layer by index
     */
    removeLayer(index: number): boolean;
    /**
     * Paint a layer at a position with given weight
     */
    paintAt(x: number, z: number, layerIndex: number, weight: number, radius?: number): number;
    /**
     * Get weights at a position
     */
    getWeights(x: number, z: number): number[];
    /**
     * Get dominant layer at a position
     */
    getDominantLayer(x: number, z: number): number;
    /**
     * Undo last paint operation
     */
    undo(): boolean;
    /**
     * Normalize weights to sum to 1
     */
    private normalizeWeights;
    /**
     * Get layer definitions
     */
    getLayers(): PaintLayer[];
    getLayerCount(): number;
    getUndoCount(): number;
}
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