/**
 * Adaptive surface tessellation.
 * Subdivides cells where the surface deviates from the bilinear approximation
 * by more than a tolerance, producing denser triangles in high-curvature areas.
 */
import { NurbsSurface } from "./surface";
export interface AdaptiveRefinementOptions {
    /** Maximum deviation from bilinear approximation before subdividing (world units). Default: 0.01 */
    tolerance?: number;
    /** Maximum normal angle deviation before subdividing (radians). Default: undefined (disabled).
     *  When set, subdivides cells where the surface normal at the midpoint deviates from the
     *  interpolated corner normals by more than this angle. Verb-nurbs uses 0.025 rad (~1.4°). */
    normalTolerance?: number;
    /** Minimum number of initial divisions in U. Default: 4 */
    minDivsU?: number;
    /** Minimum number of initial divisions in V. Default: 4 */
    minDivsV?: number;
    /** Maximum recursion depth. Default: 6 */
    maxDepth?: number;
    /** Whether to compute normals. Default: true */
    normals?: boolean;
}
export interface TessellationResult {
    vertices: Float32Array;
    normals: Float32Array;
    uvs: Float32Array;
    indices: Uint32Array;
}
/**
 * Adaptively tessellate a NURBS surface.
 */
export declare function adaptiveTessellate(surface: NurbsSurface, options?: AdaptiveRefinementOptions): TessellationResult;