Environmental Engineering Reference
In-Depth Information
presents a virtual robot activity for storage loading and unloading (SLU) process (shown in
Figure 1). It was developed using direct X and Dark Basic Professional. The Autodesk 3DS
Max software was used to build the virtual object. The VE was displayed through a
projector on a wide screen. The projector was connected via cable to a laptop controlled by a
keyboard and mouse. This wide screen allows the projection of stereoscopic images where
each eye will see the slightly shifted images.
Fig. 1. Snap shot of Virtual Robot Manufacturing System
2.2.2 Questionnaires
A qualitative assessment was conducted through the use of questionnaire. The
questionnaire was developed to identify the visual symptoms of the virtual environment
variables / attributes investigated. The questionnaire consists of two principal parts. The
first part contains the question with seven response option. This is aimed to identify the
visual problems experienced during or after interacting with the VE. The second part
contains questions to identify the level of symptoms experienced based on the answers of
the previous part. The answers to the questions in the second part were of the ordinal
data type.
2.2.3 Statistical analysis
Statistical analysis was conducted to analyse the effect/relationship between independent
variable and dependent variable. Non parametric statistic was implemented involving
descriptive statistic and statistical binomial test. The tests were on hypotheses about the
effect of each attributes or variables of the virtual environment on the incidence of visual
symptoms. The hypotheses developed were:
