利用隧道式傳送門進行虛擬環境中之移動

Abstract

當用戶在身臨其境的虛擬環境中遊覽時，暈眩(暈動症)容易影響使用者的VR體驗。由虛擬運動引起的強烈光流可能使用戶感覺不舒服。因此，減少光流可以在一定程度上減輕VR疾病。很多現代的虛擬現實應用都使用瞬間隱形傳送來減少用戶的不適。此外利用FOV限制器來減少用戶的周邊視覺接收的光流量，以減輕使用者的暈眩。但是，減小FOV會降低空間的更新性能。另外，瞬間傳送容易中斷用戶的沉浸感、干擾空間信息的收集和使用戶的迷失方向。因此，我們提出一種保留用戶空間感知的方法，為用戶提供一個舒適、身臨其境的體驗。我們在虛擬環境中採用額外的空間結構 --- 由多個傳送門構建而成的隧道，通過減少周邊視覺的光流，為使用者提供沉浸感和保留空間信息，以及減輕使用者的暈眩情況。我們進行了三項使用者實驗。在實驗1中，我們調整每個傳送門的厚度比率以讓使用者可以在隧道中舒適地移動。在實驗2中，我們希望找到隧道亮度與使用者偏好之間的關係，同時調整隧道的透明度，讓使用者在隧道內移動時感覺舒適。在最後的實驗中，我們根據使用者的舒適度、空間定向以及空間信息收集的性能比較隧道傳送與瞬間傳送。我們建議VR開發人員可以使用隧道傳送來提供一個舒適，身臨其境的體驗。

The Virtual Reality (VR) sickness is a crucial issue when the users move in immersive virtual environments. The intense optical flow caused by virtual movements could make the users feel uncomfortable. Accordingly, many works and literature have worked on reducing the optical flow to alleviate the VR sickness. A lot of modern VR applications use blink teleportation [1] to hide the translation or a FOV restrictor [2] to decrease the users’ the optical flow of peripheral vision. However, blink translation can interrupt the users’ immersion, interference the spatial information gathering and lead to disorientation. On top of that, reducing the FOV will decrease spatial updating performance [3]. Therefore, we employ an additional spatial structure, a tunnel constructed by many portals, to retain users’ spatial awareness and offer a comfortable and immersive experience to the users. Three user studies are conducted for a well-designed tunnel used in our experimental virtual environment. In study 1, the thickness ratio parameter of each portal is adjusted to let users move comfortably. In study 2, we want to find the relationship between the brightness of the tunnel and the users’ preference, and the transparency of the tunnel is also adjusted to let users feel comfortable when moving in the tunnel. In the final study, we compare the tunneling teleportation with the blink teleportation based on the users’ comfort and the performance of the spatial orientation and the spatial information gathering. We suggest that VR developers can employ the tunneling teleportation to provide a comfortable and immersive experience.