void BaseMultiEdge<D, E>::constructQuadraticForm()
{
const InformationType& omega = _information;
Matrix<double, D, 1> omega_r = - omega * _error;
for (size_t i = 0; i < _vertices.size(); ++i) {
OptimizableGraph::Vertex* from = static_cast<OptimizableGraph::Vertex*>(_vertices[i]);
bool istatus = !(from->fixed());
if (istatus) {
const MatrixXd& A = _jacobianOplus[i];
MatrixXd AtO = A.transpose() * omega;
int fromDim = from->dimension();
Map<MatrixXd> fromMap(from->hessianData(), fromDim, fromDim);
Map<VectorXd> fromB(from->bData(), fromDim);
// ii block in the hessian
#ifdef G2O_OPENMP
from->lockQuadraticForm();
#endif
fromMap.noalias() += AtO * A;
fromB.noalias() += A.transpose() * omega_r;
// compute the off-diagonal blocks ij for all j
for (size_t j = i+1; j < _vertices.size(); ++j) {
OptimizableGraph::Vertex* to = static_cast<OptimizableGraph::Vertex*>(_vertices[j]);
#ifdef G2O_OPENMP
to->lockQuadraticForm();
#endif
bool jstatus = !(to->fixed());
if (jstatus) {
const MatrixXd& B = _jacobianOplus[j];
int idx = computeUpperTriangleIndex(i, j);
assert(idx < (int)_hessian.size());
HessianHelper& hhelper = _hessian[idx];
if (hhelper.transposed) { // we have to write to the block as transposed
hhelper.matrix.noalias() += B.transpose() * AtO.transpose();
} else {
hhelper.matrix.noalias() += AtO * B;
}
}
#ifdef G2O_OPENMP
to->unlockQuadraticForm();
#endif
}
#ifdef G2O_OPENMP
from->unlockQuadraticForm();
#endif
}
}
}
