source/blender/gpu/shaders/material/gpu_shader_material_refraction.glsl


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void node_bsdf_refraction(
    vec4 color, float roughness, float ior, vec3 N, float weight, out Closure result)
{
  N = safe_normalize(N);

  ClosureRefraction refraction_data;
  refraction_data.weight = weight;
  refraction_data.color = color.rgb;
  refraction_data.N = N;
  refraction_data.roughness = roughness;
  refraction_data.ior = ior;

  result = closure_eval(refraction_data);
}