GFOVGeometric Field of View
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The display GFOV was varied between 50[degrees] and 70[degrees] and the FOV remained at 43[degrees], but no effect of FOV-GFOV difference was found on their dependent variable.
We manipulated the GFOV of a stereoscopic display between the nonperspective case (parallel projection: 0[degrees] GFOV) and a GFOV of 100[degrees] while maintaining a constant FOV.
Across GFOV levels the range-ring plane of the display was scaled to maintain a constant image size, thus avoiding the confound of image-size changes with differing GFOVs.
A weakness of previous research on pseudo-3D displays has been that although different GFOVs were investigated, no explicit reference has been made to the veridical GFOV.
In the present experiment, three alternative GFOVs were compared with the veridical GFOV.
A 4 (GFOV) x 3 (azimuth) x 3 (elevation) within-subjects factorial design was used.
The experimental trials were blocked over GFOV conditions; participants performed each GFOV block on separate days.
Figure 3 shows two stereo pairs of the display (veridical and 100[degrees] GFOVs), which comprised a blue range-ring plane, diameter 72 mm (of invariant size across GFOV conditions), centered within a blue wire-frame box that delimited the 3D volume of the display.
The diameter of the target symbol varied across GFOV conditions and symbol elevation, with the greatest range of diameters in the 100[degrees] GFOV condition.
With the exception of those symbol positions within the range-ring plane and those on the centerline of the display (the line from the COP passing through the centers of the front and rear faces of the wire-frame box and that of the range-ring plane), there was an effect on the relative positions of symbol, range rings, and wire-frame box attributable to GFOV condition.
This result further indicates that GFOV angle is an important modulating factor in the occurrence of simulator sickness.
This can be accomplished by equating GFOV and DFOV (assuming that a spatially accurate model of the VE exists).