/**
 * Returns the PDF for a particular GGX sample after reflecting the view vector
 * about a microfacet normal (includes the Jacobian for going from half vector to lighting vector)
 *
 * N = surface normal
 * L = light direction
 * V = view direction
 * H = normalize( V + L )
 *
 * @param {number} NoH dot product of N and H
 * @param {number} HoV dot product of H and V
 * @param {number} roughness
 * @returns {number}
 */
export function pdf_GGX(NoH: number, HoV: number, roughness: number): number;
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