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27 lines
1.3 KiB
27 lines
1.3 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) 2015 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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#include "null.h"
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#include "EPS.h"
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template <typename DerivedA, typename DerivedN>
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IGL_INLINE void igl::null(
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const Eigen::PlainObjectBase<DerivedA> & A,
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Eigen::PlainObjectBase<DerivedN> & N)
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{
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using namespace Eigen;
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typedef typename DerivedA::Scalar Scalar;
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JacobiSVD<Eigen::Matrix<Scalar,Eigen::Dynamic,Eigen::Dynamic> > svd(A, ComputeFullV);
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svd.setThreshold(A.cols() * svd.singularValues().maxCoeff() * EPS<Scalar>());
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N = svd.matrixV().rightCols(A.cols()-svd.rank());
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::null<Eigen::Matrix<double, 1, 3, 1, 1, 3>, Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, 1, 3, 1, 1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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template void igl::null<Eigen::Matrix<float, 1, 3, 1, 1, 3>, Eigen::Matrix<float, 3, 2, 0, 3, 2> >(Eigen::PlainObjectBase<Eigen::Matrix<float, 1, 3, 1, 1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<float, 3, 2, 0, 3, 2> >&);
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#endif
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