96 lines
2.8 KiB
C++
96 lines
2.8 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 "orient_outward.h"
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#include "per_face_normals.h"
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#include "barycenter.h"
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#include "doublearea.h"
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#include <iostream>
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedC,
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typename DerivedFF,
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typename DerivedI>
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IGL_INLINE void igl::orient_outward(
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const Eigen::PlainObjectBase<DerivedV> & V,
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const Eigen::PlainObjectBase<DerivedF> & F,
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const Eigen::PlainObjectBase<DerivedC> & C,
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Eigen::PlainObjectBase<DerivedFF> & FF,
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Eigen::PlainObjectBase<DerivedI> & I)
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{
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using namespace Eigen;
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using namespace std;
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assert(C.rows() == F.rows());
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assert(F.cols() == 3);
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assert(V.cols() == 3);
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// number of faces
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const int m = F.rows();
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// number of patches
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const int num_cc = C.maxCoeff()+1;
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I.resize(num_cc);
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if(&FF != &F)
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{
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FF = F;
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}
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DerivedV N,BC,BCmean;
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Matrix<typename DerivedV::Scalar,Dynamic,1> A;
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VectorXd totA(num_cc), dot(num_cc);
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Matrix<typename DerivedV::Scalar,3,1> Z(1,1,1);
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per_face_normals(V,F,Z.normalized(),N);
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barycenter(V,F,BC);
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doublearea(V,F,A);
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BCmean.setConstant(num_cc,3,0);
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dot.setConstant(num_cc,1,0);
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totA.setConstant(num_cc,1,0);
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// loop over faces
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for(int f = 0;f<m;f++)
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{
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BCmean.row(C(f)) += A(f)*BC.row(f);
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totA(C(f))+=A(f);
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}
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// take area weighted average
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for(int c = 0;c<num_cc;c++)
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{
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BCmean.row(c) /= (typename DerivedV::Scalar) totA(c);
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}
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// subtract bcmean
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for(int f = 0;f<m;f++)
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{
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BC.row(f) -= BCmean.row(C(f));
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dot(C(f)) += A(f)*N.row(f).dot(BC.row(f));
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}
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// take area weighted average
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for(int c = 0;c<num_cc;c++)
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{
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dot(c) /= (typename DerivedV::Scalar) totA(c);
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if(dot(c) < 0)
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{
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I(c) = true;
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}else
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{
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I(c) = false;
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}
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}
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// flip according to I
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for(int f = 0;f<m;f++)
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{
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if(I(C(f)))
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{
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FF.row(f) = FF.row(f).reverse().eval();
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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_outward<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::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> > 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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