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tamaas/src/surface/surface_generator_filter.cpp
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surface_generator_filter.cpp
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/**
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Tamaas 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
#include "surface_generator_filter.hh"
#include "fft_plan_manager.hh"
#include "fftransform.hh"
#include <cmath>
#include <iostream>
#include <random>
/* -------------------------------------------------------------------------- */
__BEGIN_TAMAAS__
template <UInt dim>
SurfaceGeneratorFilter<dim>::SurfaceGeneratorFilter():
SurfaceGenerator<dim>(),
filter(nullptr)
{}
/* -------------------------------------------------------------------------- */
template <UInt dim>
SurfaceGeneratorFilter<dim>::~SurfaceGeneratorFilter(){
//delete filter;
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
void SurfaceGeneratorFilter<dim>::setFilter(Filter<dim> * new_f) {
if (filter != new_f) delete filter;
filter = new_f;
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
void SurfaceGeneratorFilter<dim>::applyFilterOnSource(){
GridHermitian<Real, dim> fft_white_noise(this->filter_coefficients.sizes(),
this->filter_coefficients.lengths(),
1);
FFTransform<Real, dim> & wn_plan = FFTPlanManager::get().createPlan(this->white_noise,
fft_white_noise);
wn_plan.forwardTransform();
fft_white_noise *= filter_coefficients;
FFTransform<Real, dim> & surface_plan = FFTPlanManager::get().createPlan(this->grid,
fft_white_noise);
surface_plan.backwardTransform();
FFTPlanManager::get().destroyPlan(this->white_noise, fft_white_noise);
FFTPlanManager::get().destroyPlan(this->grid, fft_white_noise);
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
Grid<Real, dim> & SurfaceGeneratorFilter<dim>::buildSurface() {
if (this->grid.dataSize() == 0)
TAMAAS_EXCEPTION("the size of the grid is zero, did you call setSizes() ?");
if (this->filter == nullptr)
TAMAAS_EXCEPTION("filter is null, did you call setFilter() ?");
// Resizing arrays
this->white_noise.resize(this->grid.sizes());
auto hermitian_dim = GridHermitian<Real, dim>::hermitianDimensions(this->grid.sizes());
this->filter_coefficients.resize(hermitian_dim);
/// Generating white noise with gaussian distribution
this->generateWhiteNoise<std::normal_distribution<Real>>();
/// Applying filters
filter->computeFilter(this->filter_coefficients);
this->applyFilterOnSource();
/// Normalizing surface for hrms independent of number of points
this->grid *= std::sqrt(this->grid.dataSize());
return this->grid;
}
/* -------------------------------------------------------------------------- */
template class SurfaceGeneratorFilter<1>;
template class SurfaceGeneratorFilter<2>;
/* -------------------------------------------------------------------------- */
__END_TAMAAS__
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