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  const double SQRT3=sqrt(3.0);
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  const double SQRT3=sqrt(3.0);
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  /// Useful enum that represents coordiante axes.
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  /// Useful enum that represents coordiante axes.
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  enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
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  enum Axis {XAXIS=0,YAXIS=1,ZAXIS=2};
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#ifdef WIN32
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	inline bool isnan(double x) { return _isnan(x);}
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#else
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	inline bool isnan(double x) { return std::isnan(x);}
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#endif
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  template<class Scalar>
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  template<class Scalar>
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  Scalar s_min(Scalar a, Scalar b)
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  Scalar s_min(Scalar a, Scalar b)
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  {
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  {
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    return a<b ? a : b;
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    return a<b ? a : b;
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  }
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  }