clipka <ano### [at] anonymousorg> wrote:
> (where C_Metal_(N,K) is identical to C_Metal(N,K) except that it omits
> the "rgb" keyword)

Rather than write a new macro, I replaced:

  Reflectance * C_Metal_(N,K), Reflectance fresnel on

with:

  #local C_Metal_ = C_Metal (N, K);
  Reflectance * C_Metal_.x, Reflectance fresnel on

(With or without the .x makes no difference.)  Your first attempt looks more
believable.  I have posted some results in p.b.i.

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