Propagation of directional values of probability density distribution function MF::Database::Node::FQ19 is carried out by MFThread function: MF::Database::Thread::DoPropagation.
Values from MF::Database::Node::FQ19 array are swapped with values from neighboring nodes. Nine pointers to distant corresponding nodes are stored in MF::Database::Thread::m_PropagationTable_Ptr. Pointers (links) to neighbor Nodes are determined during the Threads building step by MF::Database::AutoThreading::GridThreading function.