  Recently it has been shown that a two-dimensional model of self-attracting
polymers based on attracting segments with the addition of stiffness displays
three phases: a swollen phase, a globular, liquid-like phase, and an
anisotropic crystal-like phase. Here, we consider the attracting segment model
in three dimensions with the addition of stiffness. While we again identify a
swollen and two distinct collapsed phases, we find that both collapsed phases
are anisotropic, so that there is no phase in which the polymer resembles a
disordered liquid drop. Moreover all the phase transitions are first order.
