56 lines
2.4 KiB
C++
56 lines
2.4 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) 2016 Michael Rabinovich <michaelrabinovich27@gmail.com@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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#include "flipped_triangles.h"
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#include "list_to_matrix.h"
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#include <vector>
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template <typename DerivedV, typename DerivedF, typename DerivedX>
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IGL_INLINE void igl::flipped_triangles(
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const Eigen::PlainObjectBase<DerivedV> & V,
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const Eigen::PlainObjectBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedX> & X)
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{
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assert(V.cols() == 2 && "V should contain 2D positions");
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std::vector<typename DerivedX::Scalar> flip_idx;
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for (int i = 0; i < F.rows(); i++)
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{
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// https://www.cs.cmu.edu/~quake/robust.html
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typedef Eigen::Matrix<typename DerivedV::Scalar,1,2> RowVector2S;
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RowVector2S v1_n = V.row(F(i,0));
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RowVector2S v2_n = V.row(F(i,1));
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RowVector2S v3_n = V.row(F(i,2));
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Eigen::Matrix<typename DerivedV::Scalar,3,3> T2_Homo;
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T2_Homo.col(0) << v1_n(0),v1_n(1),1.;
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T2_Homo.col(1) << v2_n(0),v2_n(1),1.;
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T2_Homo.col(2) << v3_n(0),v3_n(1),1.;
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double det = T2_Homo.determinant();
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assert(det == det && "det should not be NaN");
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if (det < 0)
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{
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flip_idx.push_back(i);
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}
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}
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igl::list_to_matrix(flip_idx,X);
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}
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template <typename DerivedV, typename DerivedF>
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IGL_INLINE Eigen::VectorXi igl::flipped_triangles(
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const Eigen::PlainObjectBase<DerivedV> & V,
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const Eigen::PlainObjectBase<DerivedF> & F)
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{
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Eigen::VectorXi X;
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flipped_triangles(V,F,X);
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return X;
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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::flipped_triangles<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 1, 0, -1, 1> >&);
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template Eigen::Matrix<int, -1, 1, 0, -1, 1> igl::flipped_triangles<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&);
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#endif
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