message: fixed bug in FresnelConductorArtistic
diff: @@ -297,12 +297,15 @@ inline vec3f FresnelConductorArtistic_evalAvg(const Fresnel* uniform super)
  }
  inline Fresnel* uniform FresnelConductorArtistic_create(ShadingContext* uniform ctx,
  - const vec3f& r, const vec3f& g)
  + const vec3f& reflectivity, const vec3f& edgeTint)
  {
  FresnelConductorArtistic* uniform self =
  (FresnelConductorArtistic* uniform)ShadingContext_alloc(ctx, sizeof(FresnelConductorArtistic));
  Fresnel_Constructor(&self->super, FresnelConductorArtistic_eval, FresnelConductorArtistic_evalAvg);
  + const vec3f r = min(reflectivity, make_vec3f(0.99f));
  + const vec3f g = edgeTint;
  +
  const vec3f n_min = (1.f - r) / (1.f + r);
  const vec3f n_max = (1.f + sqrt(r)) / (1.f - sqrt(r));
  const vec3f n = g * n_min + (1.f - g) * n_max;
  