Abstract:

Orthographic projection is the most basic and most important unit in a graphics-related courses, but some researchers indicate that 23% of students still have a sense of frustration over the learning of this subject. This research applied a head-mounted display to develop a set of virtual manipulative tool. Virtual reality has the characteristics of making users completely integrate into the virtual world and 3D object being observed from different angles, so as to assist learners with interconversion between 2D and 3D graphics and to improve students’ understanding ability of orthographic projection.

This research invited 30 participants who had taken the graphics-related courses to assess this virtual manipulative system and to understand participants’ problems and usage conditions that they may have encountered during the operation. After the usage of virtual manipulative system, participants should fill out the System Usability Scale (SUS) and the Questionnaire for User Interaction Satisfaction (QUIS) in order to provide a reference basis for the development and improvement of this system.

The results show that the average score of SUS is 68.3, which is above the general level; the average mean of each item in QUIS is also greater than 5, showing that the participants are satisfied with the usage of this virtual manipulative system. More than 95% of participants had used the head-mounted display for the first time, and so they needed assistance and instruction by other people during the operation. However, after the instruction of its basic operation, most of them were able to operate it by themselves immediately. Therefore, this virtual manipulative system should intensify the supporting description for the part of operational instruction in the future.

Keywords:

Virtual Reality, Orthographic Projection, Virtual Manipulative, Usability.