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33 lines
1.1 KiB
C++
33 lines
1.1 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 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 "snap_to_fixed_up.h"
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template <typename Qtype>
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IGL_INLINE void igl::snap_to_fixed_up(
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const Eigen::Quaternion<Qtype> & q,
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Eigen::Quaternion<Qtype> & s)
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{
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using namespace Eigen;
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typedef Eigen::Matrix<Qtype,3,1> Vector3Q;
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const Vector3Q up = q.matrix() * Vector3Q(0,1,0);
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Vector3Q proj_up(0,up(1),up(2));
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if(proj_up.norm() == 0)
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{
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proj_up = Vector3Q(0,1,0);
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}
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proj_up.normalize();
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Quaternion<Qtype> dq;
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dq = Quaternion<Qtype>::FromTwoVectors(up,proj_up);
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s = dq * q;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiations
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template void igl::snap_to_fixed_up<float>(Eigen::Quaternion<float, 0> const&, Eigen::Quaternion<float, 0>&);
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template void igl::snap_to_fixed_up<double>(Eigen::Quaternion<double, 0> const&, Eigen::Quaternion<double, 0>&);
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#endif
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