Abstract: Immersion is significantly characteristic of virtual roaming. Currently perceptual distortion
is a serious problem in virtual roaming with proprioceptive interaction. Thus, the visual perception of
virtual scene motion cannot match the somatosensory perception, which undermines the immersion of
virtual roaming. The curve non-equidistant interpolation algorithm, isometric interpolation algorithm
and the real-time interpolation algorithm were established based on Catmull-Rom curve, so as to
carry out the immersion evaluation of virtual roaming with proprioceptive interaction. The results of
subjective evaluation experiments and simulation experiments show that the non-equidistant
interpolated roaming paths of Catmull-Rom curves had obvious somatosensory distortions both in
uniform roaming and in variable-speed roaming. The equidistant interpolation roaming path based on
Catmull-Rom curve was suitable for uniform roaming, but unsuitable for variable-speed roaming. The
real-time interpolated roaming path based on Catmull-Rom curve can match the real-motion speed with the scene-motion speed, thus solving the inconsistency between the visual perception and body
motion perception in virtual roaming. Therefore, the proposed algorithms can improve the immersion
of virtual roaming.

Key words: virtual roaming, proprioceptive interaction, Catmull-Rom curve, roaming path;
somatosensory evaluation