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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Shape/TruncatedEllipsoidNet.cpp
//! @brief Implements class TruncatedEllipsoidNet.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "Sample/Shape/TruncatedEllipsoidNet.h"
#include "Base/Util/Assert.h"
#include <algorithm>
#include <cmath>
TruncatedEllipsoidNet::TruncatedEllipsoidNet(double r_x, double r_y, double r_z, double height,
double dh)
{
ASSERT(std::isfinite(r_z));
static const int n_heights =
std::max(2, static_cast<int>(std::round(
static_cast<double>(IShape3D::N_Circle) * height / 2.0 / r_z + 0.5)));
double h_step = (height - dh) / (n_heights - 1);
ASSERT(std::isfinite(h_step));
m_vertices.resize(n_heights * IShape3D::N_Circle);
auto it = m_vertices.begin();
for (int i = 0; i < n_heights; ++i) {
double z = i * h_step;
// for r_z=height, dh=0, i=n_heights-1, the argument of the following sqrt should be 0,
// but can be slightly smaller because of floating-point errors, therefore needs
// to be overwritten by 0.
double radius_factor = std::sqrt(std::max(0., 1.0 - std::pow((z + r_z - height) / r_z, 2)));
ASSERT(std::isfinite(z));
ASSERT(std::isfinite(radius_factor));
auto ellipse = EllipseVerticesZ(radius_factor * r_x, radius_factor * r_y, i * h_step);
std::move(ellipse.begin(), ellipse.end(), it);
it = it + ellipse.size();
}
}
TruncatedEllipsoidNet::~TruncatedEllipsoidNet() = default;
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