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49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// 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_LENGTHS_H
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#define IGL_EDGE_LENGTHS_H
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#include "igl_inline.h"
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#include <Eigen/Dense>
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namespace igl
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{
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// Constructs a list of lengths of edges opposite each index in a face
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// (triangle/tet) list
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//
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// Templates:
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// DerivedV derived from vertex positions matrix type: i.e. MatrixXd
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// DerivedF derived from face indices matrix type: i.e. MatrixXi
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// DerivedL derived from edge lengths matrix type: i.e. MatrixXd
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// Inputs:
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// V eigen matrix #V by 3
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// F #F by 2 list of mesh edges
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// or
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// F #F by 3 list of mesh faces (must be triangles)
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// or
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// T #T by 4 list of mesh elements (must be tets)
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// Outputs:
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// L #F by {1|3|6} list of edge lengths
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// for edges, column of lengths
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// for triangles, columns correspond to edges [1,2],[2,0],[0,1]
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// for tets, columns correspond to edges
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// [3 0],[3 1],[3 2],[1 2],[2 0],[0 1]
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//
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template <typename DerivedV, typename DerivedF, typename DerivedL>
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IGL_INLINE void edge_lengths(
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const Eigen::MatrixBase<DerivedV>& V,
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const Eigen::MatrixBase<DerivedF>& F,
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Eigen::PlainObjectBase<DerivedL>& L);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "edge_lengths.cpp"
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#endif
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#endif
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