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70 lines
2.7 KiB
70 lines
2.7 KiB
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2020 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 "exploded_view.h"
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#include "barycenter.h"
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#include "volume.h"
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template <
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typename DerivedV,
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typename DerivedT,
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typename DerivedEV,
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typename DerivedEF,
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typename DerivedI,
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typename DerivedJ>
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IGL_INLINE void igl::exploded_view(
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedT> & T,
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const typename DerivedV::Scalar s,
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const typename DerivedV::Scalar t,
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Eigen::PlainObjectBase<DerivedEV> & EV,
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Eigen::PlainObjectBase<DerivedEF> & EF,
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Eigen::PlainObjectBase<DerivedI> & I,
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Eigen::PlainObjectBase<DerivedJ> & J)
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{
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assert(T.cols() == 4 && "T should be a tet mesh");
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EV.resize(4*T.rows(),3);
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EF.resize(4*T.rows(),3);
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I.resize(EV.rows());
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J.resize(EF.rows());
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Eigen::MatrixXd BC;
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igl::barycenter(V,T,BC);
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Eigen::VectorXd vol;
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igl::volume(V,T,vol);
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const Eigen::RowVectorXd c = vol.transpose()*BC/vol.array().sum();
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for(int i = 0;i<T.rows();i++)
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{
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// scale the barycenters outward
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const auto tbc = ((BC.row(i)-c)*t+c).eval();
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for(int j = 0;j<4;j++)
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{
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// vector to barycenter
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const auto v = V.row(T(i,j))-BC.row(i);
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// scale vector and add to scaled barycenter
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EV.row(i*4+j) = v*s+tbc;
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I(i*4+j) = T(i,j);
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J(i*4+j) = i;
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if(j%2)
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{
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EF(i*4+j,0) = i*4+((j+3)%4);
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EF(i*4+j,1) = i*4+((j+2)%4);
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EF(i*4+j,2) = i*4+((j+1)%4);
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}else
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{
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EF(i*4+j,0) = i*4+((j+1)%4);
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EF(i*4+j,1) = i*4+((j+2)%4);
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EF(i*4+j,2) = i*4+((j+3)%4);
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}
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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::exploded_view<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<int, -1, -1, 0, -1, -1>, Eigen::Matrix<int, -1, 1, 0, -1, 1>, Eigen::Matrix<int, -1, 1, 0, -1, 1> >(Eigen::MatrixBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::Matrix<double, -1, -1, 0, -1, -1>::Scalar, Eigen::Matrix<double, -1, -1, 0, -1, -1>::Scalar, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&, Eigen::PlainObjectBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> >&, 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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