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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sim/Computation/GISASSpecularContribution.cpp
//! @brief Implements class GISASSpecularContribution.
//!
//! @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 "Sim/Computation/GISASSpecularContribution.h"
#include "Base/Util/Assert.h"
#include "Resample/Element/DiffuseElement.h"
#include "Resample/Flux/MatrixFlux.h"
#include "Resample/Flux/ScalarFlux.h"
#include "Resample/Processed/ReSample.h"
#include "Sim/Computation/SpecularComputation.h"
double Compute::gisasSpecularContribution(const ReSample& re_sample, const DiffuseElement& ele)
{
if (!ele.isSpecular())
return 0;
double sin_alpha_i = std::abs(std::sin(ele.alphaI()));
if (sin_alpha_i == 0.0)
return 0;
const double solid_angle = ele.solidAngle();
if (solid_angle <= 0.0)
return 0;
double geom_factor = sin_alpha_i / solid_angle;
if (re_sample.polarizing()) {
const auto* flux = dynamic_cast<const MatrixFlux*>(ele.fluxIn(0));
ASSERT(flux);
const SpinMatrix R = flux->getReflectionMatrix();
const SpinMatrix& polMatrix = ele.polarizer();
const SpinMatrix& anaMatrix = ele.analyzer();
return Compute::magneticR(R, polMatrix, anaMatrix) * geom_factor;
}
const auto* flux = dynamic_cast<const ScalarFlux*>(ele.fluxIn(0));
ASSERT(flux);
const complex_t R = flux->getScalarR();
return Compute::scalarR(R) * geom_factor;
}
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