43 lines
1.5 KiB
C
43 lines
1.5 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) 2017 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_ORIENTED_FACETS_H
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#define IGL_ORIENTED_FACETS_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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// ORIENTED_FACETS Determines all "directed
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// [facets](https://en.wikipedia.org/wiki/Simplex#Elements)" of a given set of
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// simplicial elements. For a manifold triangle mesh, this computes all
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// half-edges. For a manifold tetrahedral mesh, this computes all half-faces.
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//
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// Inputs:
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// F #F by simplex_size list of simplices
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// Outputs:
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// E #E by simplex_size-1 list of facets, such that E.row(f+#F*c) is the
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// facet opposite F(f,c)
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//
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// Note: this is not the same as igl::edges because this includes every
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// directed edge including repeats (meaning interior edges on a surface will
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// show up once for each direction and non-manifold edges may appear more than
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// once for each direction).
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//
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// Note: This replaces the deprecated `all_edges` function
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template <typename DerivedF, typename DerivedE>
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IGL_INLINE void oriented_facets(
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedE> & E);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "oriented_facets.cpp"
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#endif
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#endif
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