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56 lines
1.2 KiB
C++
56 lines
1.2 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 Daniele Panozzo <daniele.panozzo@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 "fit_plane.h"
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#include <iostream>
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IGL_INLINE void igl::fit_plane(
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const Eigen::MatrixXd & V,
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Eigen::RowVector3d & N,
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Eigen::RowVector3d & C)
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{
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assert(V.rows()>0);
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Eigen::Vector3d sum = V.colwise().sum();
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Eigen::Vector3d center = sum.array()/(double(V.rows()));
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C = center;
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double sumXX=0.0f,sumXY=0.0f,sumXZ=0.0f;
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double sumYY=0.0f,sumYZ=0.0f;
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double sumZZ=0.0f;
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for(int i=0;i<V.rows();i++)
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{
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double diffX=V(i,0)-center(0);
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double diffY=V(i,1)-center(1);
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double diffZ=V(i,2)-center(2);
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sumXX+=diffX*diffX;
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sumXY+=diffX*diffY;
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sumXZ+=diffX*diffZ;
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sumYY+=diffY*diffY;
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sumYZ+=diffY*diffZ;
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sumZZ+=diffZ*diffZ;
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}
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Eigen::MatrixXd m(3,3);
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m << sumXX,sumXY,sumXZ,
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sumXY,sumYY,sumYZ,
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sumXZ,sumYZ,sumZZ;
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Eigen::SelfAdjointEigenSolver<Eigen::MatrixXd> es(m);
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N = es.eigenvectors().col(0);
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}
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#ifdef IGL_STATIC_LIBRARY
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#endif
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