Table 1.

Criteria of immersion levels.

Immersion level	Projection devices	Motion capture	Overall immersion
Low	Non-surround projection devices without isolation from physical reality (e.g., computer screen, television screen, projector screen)	No motion capture; the user’s perception of self-location and possible actions is absent	Classified as low immersion in both projection devices and motion capture
Medium	CAVEs with limited isolation from physical reality	Head motion capture providing a free view to match head movement	One or both of the projection devices and motion capture are classified as medium immersion
High	HMDs capable of complete isolation from physical reality	Head and body motion capture. They provide a free field of view simultaneously allowing displacement through proprioceptive motion in the simulated space	Classified as high immersion in both projection devices and motion capture

CAVE, cave automatic virtual environment; HMD, head-mounted display.