Function luminance

common/math/color.h:260–260

! computes luminance of a color */

  /*! computes luminance of a color */
  __forceinline float luminance (const Color& a) { return madd(0.212671f,a.r,madd(0.715160f,a.g,0.072169f*a.b)); }

  /*! output operator */
  __forceinline embree_ostream operator<<(embree_ostream cout, const Color& a) {