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		/// Construct a matrix with identical elements.

		Mat4x4d(double a): 

			ArithSqMat4x4Float<Vec4d, Mat4x4d> (a) {}

		/// Construct from a pointed to array of 16 floats.

		Mat4x4d(const float* sa): ArithSqMat4x4Float<Vec4d, Mat4x4d> (sa) {}

	};

	/// Create a rotation _matrix. Rotates about one of the major axes.

	Mat4x4d rotation_Mat4x4d(CGLA::Axis axis, float angle);

	/// Create a translation matrix

	Mat4x4d translation_Mat4x4d(const Vec3d&);

	/// Create a scaling matrix.

	Mat4x4d scaling_Mat4x4d(const Vec3d&);

	/// Create an identity matrix.

	inline Mat4x4d identity_Mat4x4d()

	{

		return Mat4x4d(Vec4d(1,0,0,0), 

									 Vec4d(0,1,0,0), 

									 Vec4d(0,0,1,0), 

									 Vec4d(0,0,0,1));

	}

	/** Create a perspective matrix. Assumes the eye is at the origin and

			that we are looking down the negative z axis.

			ACTUALLY THE EYE IS NOT AT THE ORIGIN BUT BEHIND IT. CHECK UP ON

			THIS ONE */

	Mat4x4d perspective_Mat4x4d(float d);