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30 lines
1.3 KiB
30 lines
1.3 KiB
// 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 "circumradius.h"
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#include "edge_lengths.h"
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#include "doublearea.h"
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template <
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typename DerivedV,
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typename DerivedF,
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typename DerivedR>
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IGL_INLINE void igl::circumradius(
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedF> & F,
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Eigen::PlainObjectBase<DerivedR> & R)
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{
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Eigen::Matrix<typename DerivedV::Scalar,Eigen::Dynamic,3> l;
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igl::edge_lengths(V,F,l);
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DerivedR A;
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igl::doublearea(l,0.,A);
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// use formula: R=abc/(4*area) to compute the circum radius
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R = l.col(0).array() * l.col(1).array() * l.col(2).array() / (2.0*A.array());
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}
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#ifdef IGL_STATIC_LIBRARY
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template void igl::circumradius<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::MatrixBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> > const&, Eigen::MatrixBase<Eigen::Matrix<int, -1, -1, 0, -1, -1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1> >&);
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#endif
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