import { Document } from '@gltf-transform/core';
export interface WeldedSimplifyResult {
    before: number;
    after: number;
    /** Fraction of output triangles whose three corners agreed on one source UV chart (1 = zero smear). */
    uvCoherence: number;
}
export interface SeamAnalysis {
    verts: number;
    positions: number;
    charts: number;
    tris: number;
    /** True when the atlas is shredded into micro-charts (>= 1 chart per 50 tris). Attribute-preserving
     * simplify on such a mesh is both floored AND lumpy (only chart interiors may collapse) — route it
     * through weldedSimplify + unwrap + bake instead. */
    microChartAtlas: boolean;
}
/** Measures how seam-shredded a mesh is: index-connectivity islands ARE the atlas charts. */
export declare function analyzeSeams(document: Document): SeamAnalysis;
/**
 * Seam-breaking simplification for baked-atlas IMPORTS (Meshy-class meshes). Their auto-unwrap shreds
 * the atlas into micro-charts (~7 tris each on the reference warrior), splitting every border vertex;
 * meshopt preserves attribute seams, so attribute-aware simplify floors at the chart-border ring
 * (~34% of source) regardless of error budget. This stage welds vertices by exact position (the
 * position-level surface is a clean manifold that simplifies to any target), then repairs attributes:
 * each output corner is re-pointed at a REAL original vertex — per triangle, the UV chart shared by
 * the most corners wins, so triangles that survived inside one chart keep pristine UVs and only
 * chart-spanning triangles smear. Normals are recomputed smooth (source normals are per-copy shreds);
 * every other attribute (JOINTS/WEIGHTS/...) rides along with the chosen copy, so skinning survives.
 * NEVER use on first-party identity-texture bodies — this trades UV fidelity for triangle count.
 */
export declare function weldedSimplify(document: Document, targetTris: number, errorCap?: number): Promise<WeldedSimplifyResult>;