  Haptic feedback has become crucial to enhance the user experiences in Virtual
Reality (VR). This justifies the sudden burst of novel haptic solutions
proposed these past years in the HCI community. This article is a survey of
Virtual Reality interactions, relying on haptic devices. We propose two
dimensions to describe and compare the current haptic solutions: their degree
of physicality, as well as their degree of actuation. We depict a compromise
between the user and the designer, highlighting how the range of required or
proposed stimulation in VR is opposed to the haptic interfaces flexibility and
their deployment in real-life use-cases. This paper (1) outlines the variety of
haptic solutions and provides a novel perspective for analysing their
associated interactions, (2) highlights the limits of the current evaluation
criteria regarding these interactions, and finally (3) reflects the
interaction, operation and conception potentials of "encountered-type of haptic
devices".
