51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
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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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// Inputs:
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// V #V by dim list of mesh vertex positions (unused)
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// F #F by 3 list of triangle indices into V
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// Outputs:
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// EV #Ex2 matrix storing the edge description as pair of indices to
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// vertices
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// FE #Fx3 matrix storing the Triangle-Edge relation
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// EF #Ex2 matrix storing the Edge-Triangle relation
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//
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// TODO: 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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template <typename DerivedV, typename DerivedF>
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IGL_INLINE void edge_topology(
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const Eigen::PlainObjectBase<DerivedV>& V,
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const Eigen::PlainObjectBase<DerivedF>& F,
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Eigen::MatrixXi& EV,
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Eigen::MatrixXi& FE,
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Eigen::MatrixXi& 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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