Nissan Confidential C図７．VR評価環境による上質感の評価Test Technologies Contributing to Electrification - 3. Virtual Reality Test Technologies for Evaluating Quality of New Mechanical Parts Without PrototypingHead-mounted displayFig. 8 Evaluation of the sense of quality using VR evaluation environment (example)4. Technological features5. SummaryReferencesThe determined reproduction elements are structured in a virtual space using a head-mounted display. The software to construct the “field of view in response to the actual eye positions and visual line of the evaluator” among the reproduction elements presented in Fig. 7 in a virtual space was developed in-house. This software allows matching the behavior of the evaluator and the approach to viewing the object with that of reality, and it thus helps realize an accurate evaluation of the impression of the automatic movement of the retractable door handles. Further, a software for the reproduction element “movement of the door handle protruding from the retracted position” was developed in-house. This software allows the direct input of design values for the time-series change in the variation, considering the amount of protrusion presented in Fig. 3. This allows for easy switching between different variation characteristics in the virtual space. Thus, the threshold value for impairing the sense of quality can be evaluated while changing the variation in the amount of protrusion (Fig. 8).A general-purpose VR system cannot realize a virtual space suitable for evaluating impressions, and therefore, a VR evaluation environment was developed in-house by the test engineering division for automobile development. The developed VR evaluation environment considers the key points of evaluation.The reproduction of the “field of view” in response to the actual eye positions and visual line of the evaluator contributes to evaluating the impression of appearance in the virtual space. The eye position, visual line, and field of view change in response to the behavior of the driver in real time in actual scenes when using a vehicle. In other words, the appearance of the object when viewed by the user and how it affects the impression are determined by the behaviors of the driver, such as while riding a car. Therefore, it is important to reproduce the field of view in response to the actual eye positions and visual line of the evaluator and to any changes in response to the evaluatorʼs behavior. The position of a viewpoint in a general-purpose VR system is determined by defining a specific position in the virtual space. This implies that it does not reflect the absolute position of the viewpoint in real space relative to a specific reference point. The distance from the contact point between the evaluatorʼs feet and the ground to the head-mounted display is calculated using the general-purpose VR function for detecting the relative position of the reference point and head-mounted display. This distance is used to correct the deviation between the sensor position of the head-mounted display and positions of the eyes to reproduce the position of the viewpoint in the VR evaluation environment.To evaluate the impression received from the visual sense an in-house VR evaluation environment was developed that includes a digital mockup in which the field of view linked to the evaluator's behaviors and the movement of an object due to design tolerances can be reproduced and viewed in actual size. As a result, it was made possible to set goals for emotional value. The reproduction elements of the VR evaluation environment will be expanded to deal with emotional values of various functions in the future, contributing to maximizing the value of ever-increasing electrified and intelligent parts.（1） D. Zeltzer : "Autonomy, interaction and presence". Presence, 1, 1, pp.127-132（1992） MITPress（2） 舘 暲: バーチャルリアリティ, 3D映像, Vol.20, No.4, pp.91-98 （2006.11）（3） 廣瀬 通孝：トコトンやさしいVRの本、日刊工業新聞社 （2019/3/1）Deviation between front and rear ends of door handle・Variation in design that compromises high qualityand is unacceptable48
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