intern/cycles/kernel/osl/shaders/node_fresnel.osl


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/* SPDX-License-Identifier: Apache-2.0
 * Copyright 2011-2022 Blender Foundation */

#include "node_fresnel.h"
#include "stdcycles.h"

shader node_fresnel(float IOR = 1.45, normal Normal = N, output float Fac = 0.0)
{
  float f = max(IOR, 1e-5);
  float eta = backfacing() ? 1.0 / f : f;
  float cosi = dot(I, Normal);
  Fac = fresnel_dielectric_cos(cosi, eta);
}