import { BlendMode, ConwayGeometryWasm, MaterialObject } from "../../dependencies/conway-geom/index.js";
export type ColorRGBA = [
    number,
    number,
    number,
    number
];
/**
 * Convert a specular exponent (e.g. phong or blinn) to roughness
 *
 * Uses the conversion from - http://simonstechblog.blogspot.com/2011/12/microfacet-brdf.html
 *
 * @param shininess The shinyness exponent/𝛼 to convert to roughness
 * @return {number} The resultant roughness.
 */
export declare function exponentToRoughness(shininess: number): number;
/**
 * Convert a roughness to specular exponent
 *
 * Uses the conversion from - http://simonstechblog.blogspot.com/2011/12/microfacet-brdf.html
 *
 * @param roughness The roughness to convert to shinyness/exponent
 * @return {number} The resultant shinyness.
 */
export declare function roughnessToExponent(roughness: number): number;
/**
 * A canonical material represents the internal material type we pass
 * around and support wiring up to gltf like properties.
 */
export interface CanonicalMaterial {
    /**
     * The name of this material, which may be procedurally generated.
     */
    readonly name: string;
    /**
     * The base color of this material (in PBR terms)
     */
    readonly baseColor: ColorRGBA;
    /**
     * Legacy color to match web-ifc display
     */
    readonly legacyColor: ColorRGBA;
    /**
     * How metallic is this surface? 0 for dialletric, 1 for metal.
     */
    readonly metalness?: number;
    /**
     * How rough is this surface vs how shiny (1 for maximum rougness, 0 for full specular)
     */
    readonly roughness?: number;
    /**
     * The index of refraction of this surface.
     */
    readonly ior?: number;
    /**
     * The specular color of this surface (F0, overrides the F0 that would
     * be produced by baseColor, metalness and index of refraction).
     */
    readonly specular?: ColorRGBA;
    /**
     * Is this material double sided or is it back face culled?
     */
    readonly doubleSided: boolean;
    /**
     * The blend mode for this surface (should probably be opaque).
     */
    readonly blend: BlendMode;
}
/**
 * Serialize a canonical material to a stable string for hashing or comparison.
 *
 * @param mat The canonical material to serialize.
 * @return {string} A pipe-delimited string representation of the material.
 */
export declare function canonicalMaterialToString(mat: CanonicalMaterial): string;
/**
 * A material name cleaned for OBJ syntax
 *
 * @param from The material to get a clean name for
 * @return {string} The cleaned name
 */
export declare function getMTLCleanName(from: CanonicalMaterial): string;
/**
 * Dump a material to MTL format.
 *
 * @param from The material to dump.
 * @return {string} The MTL formatted string.
 */
export declare function dumpMTL(from: CanonicalMaterial): string;
export declare const defaultCanonicalMaterial: CanonicalMaterial;
/**
 * Convert a canonical material to a native material
 *
 * @param wasm The wasm object to use for conversion.
 * @param from The material to convert.
 * @return {MaterialObject} The native material object.
 */
export declare function toNativeMaterial(wasm: ConwayGeometryWasm, from: CanonicalMaterial): MaterialObject;
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