/**
* Construct the volume encompassing the sample + any environment kit. The
* beam profile defines a bounding region for the sampling of the scattering
* position.
* @param sample A reference to a sample object that defines a valid shape
* & material
* @param activeRegion Restrict scattering point sampling to this region
*/
MCInteractionVolume::MCInteractionVolume(
const API::Sample &sample, const Geometry::BoundingBox &activeRegion)
: m_sample(sample.getShape()), m_env(nullptr),
m_activeRegion(activeRegion) {
if (!m_sample.hasValidShape()) {
throw std::invalid_argument(
"MCInteractionVolume() - Sample shape does not have a valid shape.");
}
try {
m_env = &sample.getEnvironment();
if (m_env->nelements() == 0) {
throw std::invalid_argument(
"MCInteractionVolume() - Sample enviroment has zero components.");
}
} catch (std::runtime_error &) {
// swallow this as no defined environment from getEnvironment
}
}
/**
* Compute a region that defines how the beam illuminates the given sample/can
* @param sample A reference to a sample object holding its shape
* @return A BoundingBox defining the active region
*/
Geometry::BoundingBox
RectangularBeamProfile::defineActiveRegion(const API::Sample &sample) const {
auto sampleBox = sample.getShape().getBoundingBox();
try {
const auto &envBox = sample.getEnvironment().boundingBox();
sampleBox.grow(envBox);
} catch (std::runtime_error &) {
}
// In the beam direction use the maximum sample extent other wise restrict
// the active region to the width/height of beam
const auto &sampleMin(sampleBox.minPoint());
const auto &sampleMax(sampleBox.maxPoint());
V3D minPoint, maxPoint;
minPoint[m_horIdx] = m_min[m_horIdx];
maxPoint[m_horIdx] = m_min[m_horIdx] + m_width;
minPoint[m_upIdx] = m_min[m_upIdx];
maxPoint[m_upIdx] = m_min[m_upIdx] + m_height;
minPoint[m_beamIdx] = sampleMin[m_beamIdx];
maxPoint[m_beamIdx] = sampleMax[m_beamIdx];
return Geometry::BoundingBox(maxPoint.X(), maxPoint.Y(), maxPoint.Z(),
minPoint.X(), minPoint.Y(), minPoint.Z());
}