<![CDATA[Conventional promotional media such as brochures, scale models, and two-dimensional images provide limited spatial exploration for prospective homebuyers. This study developed a mobile Virtual Reality application for housing promotion integrating 360° panoramas, reticle-based gaze interaction, gyroscope orientation, a minimap, and lighting and faucet controls. Development followed the Multimedia Development Life Cycle. A raycast aligned with the camera view triggers an action after the reticle remains on a target for two seconds. Android functions were evaluated using Black Box Testing, while visual effectiveness was assessed with 36 respondents through a web-based panoramic tour using the EPIC Model. All functional scenarios succeeded in five repetitions. Testing on an ASUS ROG Phone 9 FE showed a relatively stable frame rate of approximately 30 FPS, with initial loading and scene transitions taking about two seconds. All questionnaire items were valid, with correlations above 0.329, and Cronbach’s Alpha reached 0.917. The overall EPIC score was 4.37, categorized as Very Effective, with Impact obtaining the highest score of 4.41. The findings show that the panoramic tour was effective as a visual promotional medium, while the reticle-based interaction mechanism functioned as designed.]]>
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