77 lines
1.8 KiB
C++
77 lines
1.8 KiB
C++
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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) 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 "covariance_scatter_matrix.h"
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#include "arap_linear_block.h"
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#include "cotmatrix.h"
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#include "diag.h"
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#include "sum.h"
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#include "edges.h"
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#include "verbose.h"
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#include "cat.h"
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#include "PI.h"
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IGL_INLINE void igl::covariance_scatter_matrix(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const ARAPEnergyType energy,
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Eigen::SparseMatrix<double>& CSM)
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{
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using namespace Eigen;
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// number of mesh vertices
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int n = V.rows();
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assert(n > F.maxCoeff());
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// dimension of mesh
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int dim = V.cols();
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// Number of mesh elements
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int m = F.rows();
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// number of rotations
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int nr;
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switch(energy)
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{
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case ARAP_ENERGY_TYPE_SPOKES:
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nr = n;
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break;
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case ARAP_ENERGY_TYPE_SPOKES_AND_RIMS:
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nr = n;
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break;
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case ARAP_ENERGY_TYPE_ELEMENTS:
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nr = m;
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break;
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default:
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fprintf(
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stderr,
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"covariance_scatter_matrix.h: Error: Unsupported arap energy %d\n",
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energy);
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return;
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}
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SparseMatrix<double> KX,KY,KZ;
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arap_linear_block(V,F,0,energy,KX);
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arap_linear_block(V,F,1,energy,KY);
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SparseMatrix<double> Z(n,nr);
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if(dim == 2)
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{
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CSM = cat(1,cat(2,KX,Z),cat(2,Z,KY)).transpose();
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}else if(dim == 3)
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{
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arap_linear_block(V,F,2,energy,KZ);
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SparseMatrix<double>ZZ(n,nr*2);
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CSM =
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cat(1,cat(1,cat(2,KX,ZZ),cat(2,cat(2,Z,KY),Z)),cat(2,ZZ,KZ)).transpose();
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}else
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{
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fprintf(
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stderr,
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"covariance_scatter_matrix.h: Error: Unsupported dimension %d\n",
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dim);
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return;
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}
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}
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