## 3 Method
### VR Shopping Model Construction
#### 3.4.2 VR Shopping Model Development Practice  
(1) Packaging modeling  
Various methods exist for displaying goods in a VR shopping system, such as using product images to enhance display or constructing models to replicate real-world shopping small environments, where products are often three-dimensional [40; 41]. Compared to the first method, which allows for quick retrieval of goods but offers poor display quality of product packaging, the second method, which simulates natural shopping scenes, immerses consumers more effectively and provides a more tangible display of products and packaging, with more significant opportunities for interactive design. This study's VR shopping system simulates a natural shopping environment. Bagged potato chips and bottled Coca-Cola were selected as examples of modeling and animation design. The models and textures were integrated to create the virtual representations of these two packaging products. Animation design was also required to achieve interactive dynamic effects within the VR environment. Following the tactile design concept, Maya was used to design two interactive packaging effects: the tearing of the potato chip bag and the opening of the Coke bottle cap, along with the deformation of the bottle body. Finally, static and force deformation effects were produced, as illustrated in Figure 9.  
(2) Scene construction  
To provide a shopping experience in the VR environment that closely mirrors real-life conditions and enhances consumer immersion, the system's functional architecture is designed to replicate a typical shopping scene [42; 43; 44]. This includes entering the store, walking, maneuvering a shopping cart, browsing shelves, selecting items, and checking out. Additionally, functions are refined and augmented to meet consumer needs better, ensuring a realistic shopping experience. To address the challenge of calculating the total  
Figure 8: VR Shopping Model Technology Roadmap. Figure 7: PICO Neo3 glasses. price when consumers select numerous items, a sub-function for electronic billing has been integrated into the VR shopping system, aiding consumers in managing their expenses. The VR shopping system is modeled after a small store. The prepared model is imported into Unity3D for integration and placement to create the scene depicted in Figure 10. The scene's layout is based on actual store operations and consumer behavior within the VR shopping system. The store's space is kept compact to avoid overwhelming users and prevent potential discomfort, such as dizziness. The layout includes three shelves, refrigerators, and a checkout counter. (3) Packaging multi-sensory design solutions  
In a virtual reality (VR) environment, packaging is represented as a model within the simulated space. The design of the multi-sensory experience for packaging in this virtual context aims to convey visual, auditory, and tactile sensations through alterations in the model's shape, color, sound effects, and light intensity [45; 46]. Effective simulation of olfactory and gustatory experiences in virtual reality remains unresolved. Therefore, the focus is on the visual, auditory, and tactile aspects of packaging and its materials. The tactile experience in VR primarily relies on visual and auditory cues to create a psychological sense of touch. The movement of the hand model in the virtual space is controlled by the VR headset's controller, with distinct actions mapped to different buttons. This setup allows the virtual hand model to replicate real-world hand movements. Design considerations include aspects such as the opening process of the packaging, the distance and duration of tearing, the associated sound effects, collisions, and stress-induced deformation of the packaging, all of which contribute to a simulated tactile experience. Visual experiences are enhanced by meticulously replicating the packaging model and store environment, ensuring accurate color matching to mimic real-world appearances.