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				#ifndef DEDGE_H_
				#define DEDGE_H_

				#include <Eigen/Core>
				#include <Eigen/Dense>
				#include <vector>

				namespace qflow {

				using namespace Eigen;

				inline int dedge_prev_3(int e) { return (e % 3 == 0) ? e + 2 : e - 1; }
				inline int dedge_next_3(int e) { return (e % 3 == 2) ? e - 2 : e + 1; }

				bool compute_direct_graph(MatrixXd& V, MatrixXi& F, VectorXi& V2E,
				VectorXi& E2E, VectorXi& boundary, VectorXi& nonManifold);

				void compute_direct_graph_quad(std::vector<Vector3d>& V, std::vector<Vector4i>& F, std::vector<int>& V2E,
				std::vector<int>& E2E, VectorXi& boundary, VectorXi& nonManifold);

				void remove_nonmanifold(std::vector<Vector4i> &F, std::vector<Vector3d> &V);

				} // namespace qflow

				#endif