  An optical vortex, generally associated with a spiral phase, can carry
longitudinal orbital angular momentum (OAM) in the direction of beam
propagation, or transverse OAM perpendicular to beam propagation. In this work,
we introduce complex temporal and spatial features to optical OAM through
stable collision of spatiotemporal and spatial vortices within one wave packet.
Interactions between the transverse OAM carried by the spatiotemporal vortex
and the longitudinal OAM carried by the spatial vortex are experimentally
observed, showing a controllable orientation of the total OAM with respect to
the propagation direction. Wavepacket containing rapidly varying OAM
orientation is also demonstrated. The three-dimensional orientation and
non-static temporal features empower novel applications of the OAM of photons.
