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muSpectre/tests/test_geometry.cc
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test_geometry.cc
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/**
* file test_geometry.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 19 Apr 2018
*
* @brief Tests for tensor rotations
*
* @section LICENSE
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "common/geometry.hh"
#include "tests.hh"
#include "test_goodies.hh"
#include "common/T4_map_proxy.hh"
#include <Eigen/Dense>
#include <boost/mpl/list.hpp>
#include <cmath>
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(geometry);
/* ---------------------------------------------------------------------- */
template <Dim_t Dim_, RotationOrder Rot>
struct RotationFixture {
static constexpr Dim_t Dim{Dim_};
using Vec_t = Eigen::Matrix<Real, Dim, 1>;
using Mat_t = Eigen::Matrix<Real, Dim, Dim>;
using Ten_t = T4Mat<Real, Dim>;
using Angles_t = Eigen::Matrix<Real, (Dim == threeD ? 3 : 1), 1>;
using Rot_t = Rotator<Dim, Rot>;
static constexpr RotationOrder EulerOrder{Rot};
static constexpr Dim_t get_Dim() { return Dim_; }
RotationFixture() : rotator{euler} {}
testGoodies::RandRange<Real> rr{};
Angles_t euler{2 * pi * Angles_t::Random()};
Vec_t v{Vec_t::Random()};
Mat_t m{Mat_t::Random()};
Ten_t t{Ten_t::Random()};
Rot_t rotator;
};
/* ---------------------------------------------------------------------- */
using fix_list =
boost::mpl::list<RotationFixture<twoD, RotationOrder::Z>,
RotationFixture<threeD, RotationOrder::ZXYTaitBryan>>;
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(rotation_test, Fix, fix_list, Fix) {
using Vec_t = typename Fix::Vec_t;
using Mat_t = typename Fix::Mat_t;
using Ten_t = typename Fix::Ten_t;
constexpr const Dim_t Dim{Fix::get_Dim()};
Vec_t & v{Fix::v};
Mat_t & m{Fix::m};
Ten_t & t{Fix::t};
const Mat_t & R{Fix::rotator.get_rot_mat()};
Vec_t v_ref{R * v};
Mat_t m_ref{R * m * R.transpose()};
Ten_t t_ref{Ten_t::Zero()};
for (int i = 0; i < Dim; ++i) {
for (int a = 0; a < Dim; ++a) {
for (int l = 0; l < Dim; ++l) {
for (int b = 0; b < Dim; ++b) {
for (int m = 0; m < Dim; ++m) {
for (int n = 0; n < Dim; ++n) {
for (int o = 0; o < Dim; ++o) {
for (int p = 0; p < Dim; ++p) {
get(t_ref, a, b, o, p) += R(a, i) * R(b, l) *
get(t, i, l, m, n) * R(o, m) *
R(p, n);
}
}
}
}
}
}
}
}
Vec_t v_rotator(Fix::rotator.rotate(v));
Mat_t m_rotator(Fix::rotator.rotate(m));
Ten_t t_rotator(Fix::rotator.rotate(t));
auto v_error{(v_rotator - v_ref).norm() / v_ref.norm()};
BOOST_CHECK_LT(v_error, tol);
auto m_error{(m_rotator - m_ref).norm() / m_ref.norm()};
BOOST_CHECK_LT(m_error, tol);
auto t_error{(t_rotator - t_ref).norm() / t_ref.norm()};
BOOST_CHECK_LT(t_error, tol);
if (t_error >= tol) {
std::cout << "t4_reference:" << std::endl << t_ref << std::endl;
std::cout << "t4_rotator:" << std::endl << t_rotator << std::endl;
}
Vec_t v_back{Fix::rotator.rotate_back(v_rotator)};
Mat_t m_back{Fix::rotator.rotate_back(m_rotator)};
Ten_t t_back{Fix::rotator.rotate_back(t_rotator)};
v_error = (v_back - v).norm() / v.norm();
BOOST_CHECK_LT(v_error, tol);
m_error = (m_back - m).norm() / m.norm();
BOOST_CHECK_LT(m_error, tol);
t_error = (t_back - t).norm() / t.norm();
BOOST_CHECK_LT(t_error, tol);
}
/* ---------------------------------------------------------------------- */
using threeD_list =
boost::mpl::list<RotationFixture<threeD, RotationOrder::ZXYTaitBryan>>;
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(rotation_matrix_test, Fix, threeD_list,
Fix) {
using Mat_t = typename Fix::Mat_t;
auto c{Eigen::cos(Fix::euler.array())};
Real c_1{c[0]}, c_2{c[1]}, c_3{c[2]};
auto s{Eigen::sin(Fix::euler.array())};
Real s_1{s[0]}, s_2{s[1]}, s_3{s[2]};
Mat_t rot_ref;
switch (Fix::EulerOrder) {
case RotationOrder::ZXYTaitBryan: {
rot_ref << c_1 * c_3 - s_1 * s_2 * s_3, -c_2 * s_1,
c_1 * s_3 + c_3 * s_1 * s_2, c_3 * s_1 + c_1 * s_2 * s_3, c_1 * c_2,
s_1 * s_3 - c_1 * c_3 * s_2, -c_2 * s_3, s_2, c_2 * c_3;
break;
}
default: {
BOOST_CHECK(false);
break;
}
}
auto err{(rot_ref - Fix::rotator.get_rot_mat()).norm()};
BOOST_CHECK_LT(err, tol);
if (err >= tol) {
std::cout << "Reference:" << std::endl << rot_ref << std::endl;
std::cout << "Rotator:" << std::endl
<< Fix::rotator.get_rot_mat() << std::endl;
}
}
BOOST_AUTO_TEST_SUITE_END();
} // namespace muSpectre
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