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