  Light manipulations such as spin-direction locking propagation, robust
transport, quantum teleportation and reconfigurable electromagnetic pathways
have been investigated at the boundaries of photonic systems. Recently by
breaking Dirac cones in time-reversal invariant photonic crystals,
valley-pseudospin coupled edge states have been employed to realize selective
propagation of light. Here, without photonic boundaries, we realize the
propagation of pseudospin states in three-dimensional bulk metacrystal
waveguides by employing the ubiquitous valley degree of freedom.
Valley-dependent pseudospin bands are achieved in three-dimensional metacrystal
waveguides without Dirac cones. Reconfigurable photonic valley Hall effect is
proposed after studying the variation of pseudospin states near K' and K
valleys. Moreover, a prototype of photonic blocker is realized by cascading two
inversion asymmetric metacrystal waveguides in which the pseudospin direction
locking propagation exists. In addition, valley-dependent pseudospin bands are
also discussed in a realistic metamaterials sample. These results show an
alternative way towards molding the pseudospin flow in photonic systems.
