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48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 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 "unzip_corners.h"
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#include "unique_rows.h"
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#include "slice.h"
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template < typename DerivedA, typename DerivedU, typename DerivedG, typename DerivedJ >
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IGL_INLINE void igl::unzip_corners(
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const std::vector<std::reference_wrapper<DerivedA> > & A,
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Eigen::PlainObjectBase<DerivedU> & U,
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Eigen::PlainObjectBase<DerivedG> & G,
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Eigen::PlainObjectBase<DerivedJ> & J)
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{
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if(A.size() == 0)
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{
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U.resize(0,0);
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G.resize(0,3);
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J.resize(0,0);
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return;
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}
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const size_t num_a = A.size();
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const typename DerivedA::Index m = A[0].get().rows();
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DerivedU C(m*3,num_a);
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for(int a = 0;a<num_a;a++)
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{
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assert(A[a].get().rows() == m && "All attributes should be same size");
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assert(A[a].get().cols() == 3 && "Must be triangles");
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C.block(0*m,a,m,1) = A[a].get().col(0);
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C.block(1*m,a,m,1) = A[a].get().col(1);
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C.block(2*m,a,m,1) = A[a].get().col(2);
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}
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DerivedJ I;
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igl::unique_rows(C,U,I,J);
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G.resize(m,3);
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for(int f = 0;f<m;f++)
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{
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for(int c = 0;c<3;c++)
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{
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G(f,c) = J(f+c*m);
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}
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}
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}
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