void CConeProjectionGeometry3D::projectPoint(float32 fX, float32 fY, float32 fZ,
int iAngleIndex,
float32 &fU, float32 &fV) const
{
ASTRA_ASSERT(iAngleIndex >= 0);
ASTRA_ASSERT(iAngleIndex < m_iProjectionAngleCount);
float alpha = m_pfProjectionAngles[iAngleIndex];
// Project point onto optical axis
// Projector direction is (cos(alpha), sin(alpha))
// Vector source->origin is (-sin(alpha), cos(alpha))
// Distance from source, projected on optical axis
float fD = -sin(alpha) * fX + cos(alpha) * fY + m_fOriginSourceDistance;
// Scale fZ to detector plane
fV = detectorOffsetYToRowIndexFloat( (fZ * (m_fOriginSourceDistance + m_fOriginDetectorDistance)) / fD );
// Orthogonal distance in XY-plane to optical axis
float fS = cos(alpha) * fX + sin(alpha) * fY;
// Scale fS to detector plane
fU = detectorOffsetXToColIndexFloat( (fS * (m_fOriginSourceDistance + m_fOriginDetectorDistance)) / fD );
ASTRA_DEBUG("alpha: %f, D: %f, V: %f, S: %f, U: %f", alpha, fD, fV, fS, fU);
}
//----------------------------------------------------------------------------------------
// Run
void CCudaForwardProjectionAlgorithm3D::run(int)
{
// check initialized
assert(m_bIsInitialized);
#if 1
CCompositeGeometryManager cgm;
cgm.doFP(m_pProjector, m_pVolume, m_pProjections);
#else
const CProjectionGeometry3D* projgeom = m_pProjections->getGeometry();
const CVolumeGeometry3D& volgeom = *m_pVolume->getGeometry();
Cuda3DProjectionKernel projKernel = ker3d_default;
if (m_pProjector) {
CCudaProjector3D* projector = dynamic_cast<CCudaProjector3D*>(m_pProjector);
projKernel = projector->getProjectionKernel();
}
#if 0
// Debugging code that gives the coordinates of the corners of the volume
// projected on the detector.
{
float fX[] = { volgeom.getWindowMinX(), volgeom.getWindowMaxX() };
float fY[] = { volgeom.getWindowMinY(), volgeom.getWindowMaxY() };
float fZ[] = { volgeom.getWindowMinZ(), volgeom.getWindowMaxZ() };
for (int a = 0; a < projgeom->getProjectionCount(); ++a)
for (int i = 0; i < 2; ++i)
for (int j = 0; j < 2; ++j)
for (int k = 0; k < 2; ++k) {
float fU, fV;
projgeom->projectPoint(fX[i], fY[j], fZ[k], a, fU, fV);
ASTRA_DEBUG("%3d %c1,%c1,%c1 -> %12f %12f", a, i ? ' ' : '-', j ? ' ' : '-', k ? ' ' : '-', fU, fV);
}
}
#endif
astraCudaFP(m_pVolume->getDataConst(), m_pProjections->getData(),
&volgeom, projgeom,
m_iGPUIndex, m_iDetectorSuperSampling, projKernel);
#endif
}
