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49 lines
1.7 KiB
49 lines
1.7 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) 2020 Oded Stein <oded.stein@columbia.edu>
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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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#include "orient_halfedges.h"
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#include "oriented_facets.h"
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#include "unique_simplices.h"
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template <typename DerivedF, typename DerivedE, typename DerivedOE>
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IGL_INLINE void
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igl::orient_halfedges(
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const Eigen::MatrixBase<DerivedF>& F,
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Eigen::PlainObjectBase<DerivedE>& E,
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Eigen::PlainObjectBase<DerivedOE>& oE)
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{
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assert(F.cols()==3 && "This only works for triangle meshes.");
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using Int = typename DerivedF::Scalar;
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const Eigen::Index m = F.rows();
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DerivedE allE, EE;
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oriented_facets(F, allE);
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Eigen::Matrix<Int, Eigen::Dynamic, 1> IA, IC;
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unique_simplices(allE, EE, IA, IC);
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E.resize(m, 3);
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oE.resize(m, 3);
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for(Eigen::Index f=0; f<m; ++f) {
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for(int e=0; e<3; ++e) {
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const Int ind = f + m*e;
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E(f,e) = IC(ind);
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assert((EE(E(f,e),0)==allE(ind,0) || EE(E(f,e),0)==allE(ind,1)) &&
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"Something is wrong in the edge matrix.");
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oE(f,e) = EE(E(f,e),0)==allE(ind,0) ? 1 : -1;
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}
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}
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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template void igl::orient_halfedges<Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&);
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#endif
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