Search Results

The purpose of this study was to investigate how the sense of presence and the accuracy of a wire tracing task varied as a function of the presence or absence of stereopsis and headtracking. Ten subjects were presented with a 3D wire on a CRT display. Subjects were asked: (1) to navigate a virtual stylus along the wire with the objective of keeping the stylus centered on the wire, and (2) to complete a survey focusing on perceived presence. The results indicated that both headtracking and stereopsis improved performance in terms of minimizing rms error, however the survey results did not indicate that headtracking and stereopsis increased the sense of presence compared to the absence of these cues.

The effect of varying the update rate of a computer-generated simulation (5, 10, 15, 20, 25 Hz) on the sense of presence within virtual environments was investigated. Thirteen subjects were asked to navigate throughout a virtual environment and perform a search related task. The results indicated that presence within the virtual environment was significantly less using an update rate of 5 and 10 Hz when compared to update rates of 20 and 25 Hz. Furthermore, the reported level of presence using a 15 Hz update rate was similar to the reported level of presence using update rates of 20 and 25 Hz. The implications of the results are discussed.

This study investigated perceptual biases in spatial judgments as a function of the computer graphics eyepoint elevation, monoscopic or stereoscopic display, and target cube location. The display for this experiments consisted of two computer-generated cubes located above a grid plane with drop lines to the display surface. The experiment task consisted of judging azimuth and elevation angles between the target and reference cubes. The results indicated that azimuth errors varied with eyepoint elevation and were maximized at the - 15 degree eyepoint, elevation errors were worse using the 75 degree eyepoint, and binocular disparity did not aid judgments of azimuth and elevation.