/**
* Fire the test ray at the instrument and perform a bread-first search of the
* object tree to find the objects that were intersected.
* @param testRay :: An input/output parameter that defines the track and accumulates the
* intersection results
*/
void InstrumentRayTracer::fireRay(Track & testRay) const
{
// Go through the instrument tree and see if we get any hits by
// (a) first testing the bounding box and if we're inside that then
// (b) test the lower components.
std::deque<IComponent_const_sptr> nodeQueue;
//Start at the root of the tree
nodeQueue.push_back(m_instrument);
IComponent_const_sptr node;
while( !nodeQueue.empty() )
{
node = nodeQueue.front();
nodeQueue.pop_front();
BoundingBox bbox;
node->getBoundingBox(bbox);
// Quick test. If this suceeds moved on to test the children
if( bbox.doesLineIntersect(testRay) )
{
if( ICompAssembly_const_sptr assembly = boost::dynamic_pointer_cast<const ICompAssembly>(node) )
{
assembly->testIntersectionWithChildren(testRay, nodeQueue);
}
else
{
throw Kernel::Exception::NotImplementedError("Implement non-comp assembly interactions");
}
}
}
}
/**
* Cache frequently accessed values
* @param instrument : The instrument for this run
* @param detID : The det ID for this observation
*/
void CachedExperimentInfo::initCaches(
const Geometry::Instrument_const_sptr &instrument, const detid_t detID) {
// Throws if detector does not exist
// Takes into account possible detector mapping
IDetector_const_sptr det = m_exptInfo.getDetectorByID(detID);
// Instrument distances
boost::shared_ptr<const ReferenceFrame> refFrame =
instrument->getReferenceFrame();
m_beam = refFrame->pointingAlongBeam();
m_up = refFrame->pointingUp();
m_horiz = refFrame->pointingHorizontal();
IComponent_const_sptr source = instrument->getSource();
IComponent_const_sptr sample = instrument->getSample();
IComponent_const_sptr aperture =
instrument->getComponentByName("aperture", 1);
if (!aperture) {
throw std::invalid_argument(
"No component named \"aperture\" found in instrument.");
}
IObjComponent_const_sptr firstChopper = instrument->getChopperPoint(0);
const Kernel::V3D samplePos = sample->getPos();
const Kernel::V3D beamDir = samplePos - source->getPos();
// Cache
m_twoTheta = det->getTwoTheta(samplePos, beamDir);
m_phi = det->getPhi();
m_modToChop = firstChopper->getDistance(*source);
m_apertureToChop = firstChopper->getDistance(*aperture);
m_chopToSample = sample->getDistance(*firstChopper);
m_sampleToDet = det->getDistance(*sample);
// Aperture
Geometry::BoundingBox apertureBox;
aperture->getBoundingBox(apertureBox);
if (apertureBox.isNull()) {
throw std::invalid_argument("CachedExperimentInfo::initCaches - Aperture "
"has no bounding box, cannot sample from it");
}
m_apertureSize.first = apertureBox.maxPoint()[0] - apertureBox.minPoint()[0];
m_apertureSize.second = apertureBox.maxPoint()[1] - apertureBox.minPoint()[1];
// Sample volume
const API::Sample &sampleDescription = m_exptInfo.sample();
const Geometry::Object &shape = sampleDescription.getShape();
m_sampleWidths = shape.getBoundingBox().width();
// Detector volume
// Make sure it encompasses all possible detectors
det->getBoundingBox(m_detBox);
if (m_detBox.isNull()) {
throw std::invalid_argument("CachedExperimentInfo::initCaches - Detector "
"has no bounding box, cannot sample from it. "
"ID:" +
boost::lexical_cast<std::string>(det->getID()));
}
const double rad2deg = 180. / M_PI;
const double thetaInDegs = twoTheta() * rad2deg;
const double phiInDegs = phi() * rad2deg;
m_gonimeter = new Goniometer;
m_gonimeter->makeUniversalGoniometer();
m_gonimeter->setRotationAngle("phi", thetaInDegs);
m_gonimeter->setRotationAngle("chi", phiInDegs);
m_sampleToDetMatrix =
m_exptInfo.sample().getOrientedLattice().getU() * m_gonimeter->getR();
// EFixed
m_efixed = m_exptInfo.getEFixed(det);
}