Environmental Engineering Reference
In-Depth Information
H1: Colour of background has effect of visual symptoms among immersive
environment users
H2: Virtual lighting has effect of visual symptoms among immersive environment users
H3: Field of View (FOV) has effect of visual symptoms among immersive environment
users
H4: Flow rate (FR) has effect of visual symptoms among immersive environment users
H5: Speed of virtual object motion has effect of visual symptoms among immersive
environment users
H6: Resolution of display has effect of visual symptoms among immersive environment
users
H7: Contrast ratio has effect of visual symptoms among immersive environment users
The level of significance was set at α = 0.05 for all analyses.
2.3 Experimental design and procedure
2.3.1 Experimental design
The experiments were conducted at the ergonomic-virtual reality laboratory. A sitting
position was adopted with the subject sitting at a distance of 15 - 25 cm from the back edge
of the table to complete the task. The activity is to operate a virtual robot in the VE using an
infrared mouse (wireless mouse) with the motion observed on the wide screen display.
The digital projector was positioned on a table 75 cm in height with an inclination angle of
between 5
o
-10
o
with respect to the horizontal axis. The projector was connected to laptop
with a display set to 1280 x 800 pixels. The distance from the front edge of the table or the
digital projector to the center of the wide screen was 300 cm. The size of wide screen display
is 170 cm in length and 155 cm in width. The bottom edge of wide screen display was
measured at 94 cm above the floor. Prior to conducting the experiment, the subjects were
made to adjust their seating positions to make them as comfortable as possible.
2.3.2 Experimental procedure
The subjects were provided with information describing the aims of the study and how the
experiment will be conducted. Their health condition and past experience of sickness were
also identified and their anthropometric data measured. The colour blind test was then
conducted before proceeding to colour selection and the experiment. If a subject cannot
complete the test, it means that the subject has some visual problems and is unable to
continue the experiment.
Prior to performing the experiment, subjects were trained on how to use the wireless mouse
in order to operate the virtual robot in the VE to complete the virtual task. Heart rate and
visual acuity was measured before and after the experiment.
In the experiment, subjects were exposed to the virtual environment to view and operate a
virtual robot by using a wireless mouse; to pick up a virtual material in a rack and to put it on
a conveyor and subsequently to also pick up a virtual product on the conveyor and store in
another rack as shown in Fig. 1. The activity was performed for 10 minutes for each attributes
and for every subject of the VE studied. All subjects were required to sit in an upright posture
