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edge_topology.h
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edge_topology.h
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// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2013 Alec Jacobson <alecjacobson@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
#ifndef IGL_EDGE_TOPOLOGY_H
#define IGL_EDGE_TOPOLOGY_H
#include "igl_inline.h"
#include <Eigen/Core>
#include <vector>
namespace igl
{
/// Initialize Edges and their topological relations (assumes an edge-manifold
/// mesh).
///
/// @param[in] V #V by dim list of mesh vertex positions (unused)
/// @param[in] F #F by 3 list of triangle indices into V
/// @param[out] EV #Ex2 matrix storing the edge description as pair of
/// indices to vertices
/// @param[out] FE #Fx3 matrix storing the Triangle-Edge relation
/// @param[out] EF #Ex2 matrix storing the Edge-Triangle relation
///
/// \note This seems to be a inferior duplicate of edge_flaps.h:
/// - unused input parameter V
/// - roughly 2x slower than edge_flaps
/// - outputs less information: edge_flaps reveals corner opposite edge
/// - FE uses non-standard and ambiguous order: FE(f,c) is merely an edge
/// incident on corner c of face f. In contrast, edge_flaps's EMAP(f,c)
/// reveals the edge _opposite_ corner c of face f
///
template <typename DerivedV, typename DerivedF, typename DerivedE>
IGL_INLINE void edge_topology(
const Eigen::MatrixBase<DerivedV>& V,
const Eigen::MatrixBase<DerivedF>& F,
Eigen::PlainObjectBase<DerivedE>& EV,
Eigen::PlainObjectBase<DerivedE>& FE,
Eigen::PlainObjectBase<DerivedE>& EF);
}
#ifndef IGL_STATIC_LIBRARY
# include "edge_topology.cpp"
#endif
#endif