/**
 * GGX diffuse distribution function
 * @see https://google.github.io/filament/Filament.md.html#listing_diffusebrdf
 * @param {number} NoH dot(n,h) where n is surface normal and h is half unit vector between incident light and outgoing light (view vector)
 * @param {number} roughness
 * @returns {number}
 */
export function diffuse_GGX(NoH: number, roughness: number): number;
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