112 lines
4.7 KiB
C++
112 lines
4.7 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 "per_corner_normals.h"
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#include "vertex_triangle_adjacency.h"
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#include "per_face_normals.h"
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#include "PI.h"
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template <typename DerivedV, typename DerivedF, typename DerivedCN>
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IGL_INLINE void igl::per_corner_normals(
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const Eigen::PlainObjectBase<DerivedV>& V,
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const Eigen::PlainObjectBase<DerivedF>& F,
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const double corner_threshold,
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Eigen::PlainObjectBase<DerivedCN> & CN)
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{
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using namespace Eigen;
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using namespace std;
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Eigen::Matrix<typename DerivedV::Scalar,Eigen::Dynamic,3> FN;
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per_face_normals(V,F,FN);
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vector<vector<int> > VF,VFi;
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vertex_triangle_adjacency(V,F,VF,VFi);
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return per_corner_normals(V,F,FN,VF,corner_threshold,CN);
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}
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedFN,
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typename DerivedCN>
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IGL_INLINE void igl::per_corner_normals(
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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<DerivedFN>& FN,
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const double corner_threshold,
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Eigen::PlainObjectBase<DerivedCN> & CN)
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{
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using namespace Eigen;
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using namespace std;
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vector<vector<int> > VF,VFi;
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vertex_triangle_adjacency(V,F,VF,VFi);
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return per_corner_normals(V,F,FN,VF,corner_threshold,CN);
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}
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedFN,
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typename IndexType,
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typename DerivedCN>
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IGL_INLINE void igl::per_corner_normals(
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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<DerivedFN>& FN,
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const std::vector<std::vector<IndexType> >& VF,
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const double corner_threshold,
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Eigen::PlainObjectBase<DerivedCN> & CN)
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{
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using namespace Eigen;
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using namespace std;
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// number of faces
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const int m = F.rows();
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// valence of faces
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const int n = F.cols();
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// initialize output to ***zero***
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CN.setZero(m*n,3);
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// loop over faces
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for(size_t i = 0;int(i)<m;i++)
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{
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// Normal of this face
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Eigen::Matrix<typename DerivedV::Scalar,3,1> fn = FN.row(i);
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// loop over corners
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for(size_t j = 0;int(j)<n;j++)
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{
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const std::vector<IndexType> &incident_faces = VF[F(i,j)];
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// loop over faces sharing vertex of this corner
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for(int k = 0;k<(int)incident_faces.size();k++)
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{
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Eigen::Matrix<typename DerivedV::Scalar,3,1> ifn = FN.row(incident_faces[k]);
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// dot product between face's normal and other face's normal
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double dp = fn.dot(ifn);
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// if difference in normal is slight then add to average
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if(dp > cos(corner_threshold*PI/180))
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{
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// add to running sum
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CN.row(i*n+j) += ifn;
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// else ignore
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}else
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{
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}
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}
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// normalize to take average
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CN.row(i*n+j).normalize();
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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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// generated by autoexplicit.sh
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template void igl::per_corner_normals<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&, double, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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template void igl::per_corner_normals<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -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<double, -1, -1, 0, -1, -1> > const&, double, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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template void igl::per_corner_normals<Eigen::Matrix<double, -1, 3, 0, -1, 3>, Eigen::Matrix<int, -1, 3, 0, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 3, 0, -1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 0, -1, 3> > const&, double, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 3, 0, -1, 3> >&);
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template void igl::per_corner_normals<Eigen::Matrix<double, -1, 3, 0, -1, 3>, Eigen::Matrix<int, -1, 3, 0, -1, 3>, Eigen::Matrix<double, -1, 3, 0, -1, 3>, Eigen::Matrix<double, -1, 3, 0, -1, 3> >(Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 3, 0, -1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, 3, 0, -1, 3> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 3, 0, -1, 3> > const&, double, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, 3, 0, -1, 3> >&);
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#endif
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