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		/// Construct a matrix from a single scalar value.
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		/// Construct a matrix from a single scalar value.
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		explicit Mat3x3d(float a): ArithSqMat3x3Float<Vec3d, Mat3x3d>(a) {}
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		explicit Mat3x3d(float a): ArithSqMat3x3Float<Vec3d, Mat3x3d>(a) {}
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	};
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	};
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  /// Create a rotation _matrix. Rotates about one of the major axes.
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  Mat3x3d rotation_Mat3x3d(CGLA::Axis axis, double angle);
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  /// Create a scaling matrix.
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  Mat3x3d scaling_Mat3x3d(const Vec3d&);
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	/// Create an identity matrix.
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	/// Create an identity matrix.
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	inline Mat3x3d identity_Mat3x3d()
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	inline Mat3x3d identity_Mat3x3d()
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	{
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	{
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		return Mat3x3d(Vec3d(1,0,0), Vec3d(0,1,0), Vec3d(0,0,1));
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		return Mat3x3d(Vec3d(1,0,0), Vec3d(0,1,0), Vec3d(0,0,1));
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	}
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	}