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https://github.com/SoftFever/OrcaSlicer.git
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2ae2672ee9
Fixing dep build script on Windows and removing some warnings. Use bundled igl by default. Not building with the dependency scripts if not explicitly stated. This way, it will stay in Fix the libigl patch to include C source files in header only mode.
73 lines
2.2 KiB
C++
73 lines
2.2 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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#include "is_symmetric.h"
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#include "find.h"
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template <typename T>
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IGL_INLINE bool igl::is_symmetric(const Eigen::SparseMatrix<T>& A)
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{
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if(A.rows() != A.cols())
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{
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return false;
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}
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assert(A.size() != 0);
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Eigen::SparseMatrix<T> AT = A.transpose();
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Eigen::SparseMatrix<T> AmAT = A-AT;
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//// Eigen screws up something with LLT if you try to do
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//SparseMatrix<T> AmAT = A-A.transpose();
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//// Eigen crashes at runtime if you try to do
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// return (A-A.transpose()).nonZeros() == 0;
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return AmAT.nonZeros() == 0;
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}
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template <typename DerivedA>
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IGL_INLINE bool igl::is_symmetric(
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const Eigen::PlainObjectBase<DerivedA>& A)
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{
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if(A.rows() != A.cols())
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{
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return false;
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}
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assert(A.size() != 0);
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return (A-A.transpose()).eval().nonZeros() == 0;
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}
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template <typename AType, typename epsilonT>
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IGL_INLINE bool igl::is_symmetric(
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const Eigen::SparseMatrix<AType>& A,
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const epsilonT epsilon)
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{
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using namespace Eigen;
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using namespace std;
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if(A.rows() != A.cols())
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{
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return false;
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}
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assert(A.size() != 0);
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SparseMatrix<AType> AT = A.transpose();
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SparseMatrix<AType> AmAT = A-AT;
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VectorXi AmATI,AmATJ;
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Matrix<AType,Dynamic,1> AmATV;
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find(AmAT,AmATI,AmATJ,AmATV);
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if(AmATI.size() == 0)
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{
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return true;
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}
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return AmATV.maxCoeff() < epsilon && AmATV.minCoeff() > -epsilon;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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// generated by autoexplicit.sh
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template bool igl::is_symmetric<Eigen::Matrix<double, -1, -1, 0, -1, -1> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&);
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// generated by autoexplicit.sh
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template bool igl::is_symmetric<double>(Eigen::SparseMatrix<double, 0, int> const&);
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template bool igl::is_symmetric<double, double>(Eigen::SparseMatrix<double, 0, int> const&, double);
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template bool igl::is_symmetric<double, int>(Eigen::SparseMatrix<double, 0, int> const&, int);
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#endif
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