/**
 *
 * Optimized variant (presented by Epic at SIGGRAPH '13)
 * https://cdn2.unrealengine.com/Resources/files/2013SiggraphPresentationsNotes-26915738.pdf
 * @param {number} dotVH
 * @return {number}
 */
export function fresnel_Schlick_optimized(dotVH: number): number;
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