Abstract
A locomotion interface which is made to walk around in Virtual Environments has been planned for a viewpoint that how we can cancel a distance of walk, for a walkspace was regarded as important. We aimed at the viewpoint which a sense of walk is regarded as important and examined how much we need a total length of the walkspace. As a result, the length of a plan which one cannot judge properly was up to 55m, and if one doesn't stop walking, its length was up to 20m, and a plan which one's walk wouldn't be disturbed was up to 6m.
