Three-dimensional Virtual Space Research Articles

Responsible metaverse: Ethical principles for guiding decision-making and maintaining complex relationships for businesses in 3D virtual spaces

A metaverse is a three-dimensional virtual space (3D VS) where businesses and individuals worldwide can engage, interact, communicate, transact, and exchange information in real-time through an immersive and collaborative platform. These interactions can create complex relationships influenced by the decision-making processes of businesses. Such complexity can lead to challenges in maintaining relationships, ensuring exclusiveness, preventing misuse, and addressing other ethical issues. Therefore, this study aims to identify ethical principles within the metaverse to guide decision-making and maintain complex relationships between users and businesses. Both qualitative and quantitative data were collected for analysis, and simple random sampling was employed for primary data collection. The empirical analysis was conducted using a mixed-method approach. The study identified four ethical principles that guide complex relationships within the metaverse: business benefit evaluation, fairness, explainability, and reliability principles. These principles positively influence decision-making, which, in turn, positively affects the maintenance of complex relationships within 3D VS.

A multimodal virtual vision platform as a next-generation vision system for a surgical robot

Robot-assisted surgery platforms are utilized globally thanks to their stereoscopic vision systems and enhanced functional assistance. However, the necessity of ergonomic improvement for their use by surgeons has been increased. In surgical robots, issues with chronic fatigue exist owing to the fixed posture of the conventional stereo viewer (SV) vision system. A head-mounted display was adopted to alleviate the inconvenience, and a virtual vision platform (VVP) is proposed in this study. The VVP can provide various critical data, including medical images, vital signs, and patient records, in three-dimensional virtual reality space so that users can access medical information simultaneously. An availability of the VVP was investigated based on various user evaluations by surgeons and novices, who executed the given tasks and answered questionnaires. The performances of the SV and VVP were not significantly different; however, the craniovertebral angle of the VVP was 16.35° higher on average than that of the SV. Survey results regarding the VVP were positive; participants indicated that the optimal number of displays was six, preferring the 2 × 3 array. Reflecting the tendencies, the VVP can be a neoconceptual candidate to be customized for medical use, which opens a new prospect in a next-generation surgical robot.Graphical

Information Security in the Metaverse: A Systematic and Prospective Review

The Metaverse, a constantly evolving three-dimensional virtual space, has captured the attention of users eager for immersive experiences. However, this exciting digital world has also raised significant concerns regarding information security. This study delves into the extensive academic literature to conduct a comprehensive analysis of security tools in the Metaverse and explore future applications in this emerging context. Three key trends emerge from this in-depth analysis. Firstly, authentication and authorization stand out as cornerstones in protecting users and their data in the Metaverse. The increasing adoption of multifactor authentication underscores the importance of safeguarding access to this virtual environment. Additionally, end-to-end encryption is presented as a vital shield against potential data breaches. The second trend focuses on data protection and privacy. The concern for preserving the integrity of personal information drives the development and implementation of data anonymization technologies, marking a significant advancement in ensuring user privacy. The third trend relates to threat detection and response. In response to the growing sophistication of risks in the Metaverse, there is an observed increase in the adoption of artificial intelligence and machine learning technologies. These advanced tools play a crucial role in identifying and proactively mitigating security risks. In summary, this analysis reveals a dynamic landscape of security in the Metaverse, characterized by the constant evolution of tools and strategies to safeguard information. As this virtual environment continues to expand, information security emerges as a fundamental component to ensure immersive and secure digital experiences.

The effect of different depth planes during a manual tracking task in three-dimensional virtual reality space

Unlike ballistic arm movements such as reaching, the contribution of depth information to the performance of manual tracking movements is unclear. Thus, to understand how the brain handles information, we investigated how a required movement along the depth axis would affect behavioral tracking performance, postulating that it would be affected by the amount of depth movement. We designed a visually guided planar tracking task that requires movement on three planes with different depths: a fronto-parallel plane called ROT (0), a sagittal plane called ROT (90), and a plane rotated by 45° with respect to the sagittal plane called ROT (45). Fifteen participants performed a circular manual tracking task under binocular and monocular visions in a three-dimensional (3D) virtual reality space. As a result, under binocular vision, ROT (90), which required the largest depth movement among the tasks, showed the greatest error in 3D. Similarly, the errors (deviation from the target path) on the depth axis revealed significant differences among the tasks. Under monocular vision, significant differences in errors were observed only on the lateral axis. Moreover, we observed that the errors in the lateral and depth axes were proportional to the required movement on these axes under binocular vision and confirmed that the required depth movement under binocular vision determined depth error independent of the other axes. This finding implies that the brain may independently process binocular vision information on each axis. Meanwhile, the required depth movement under monocular vision was independent of performance along the depth axis, indicating an intractable behavior. Our findings highlight the importance of handling depth movement, especially when a virtual reality situation, involving tracking tasks, is generated.

Application of virtual reality technology in campus landscape roaming

With the popularity of the metaverse concept, virtual reality technology is widely used in people's lives, and the emergence of this new technology also brings new development opportunities to environmental design. Using computer-aided design, 3D roaming and other methods to build a virtual three-dimensional space, people can get an interactive and immersive experience. This paper takes the Liufang campus of Wuhan University of Technology as a prototype, and builds a 3D virtual campus landscape roaming based on SketchUp and Unity3D engine. It allows the campus to adapt to the development of digital informatization, and at the same time, through the roaming scene, the experiencer can understand the school style more intuitively and quickly, and help the campus culture to be better displayed.

Identification Model of Writhing Posture of Classical Dance Based on Motion Capture Technology and Few-Shot Learning.

Chinese classical dance is cut into the inner verve from a grasp of external form in dance instruction, and the aesthetic fashion and artistic norms of classical dance are established with historical depth. The “professional specificity” of characters and the “language description” of plots are eliminated in Chinese classical dance creation, highlighting the contemporary spirit of classical dance creation. Chinese classical dance was born during the early years of the People's Republic of China. The term “classical dance” did not refer to all Chinese classical dances at the time; rather, it referred to a dance form that embodied China's national spirit and had a classical cultural heritage based on Chinese traditional dance. The average frequency of step-over was 0.9, which was higher than the average rate of basic turnover of 0.75 and step-by-step turnover of 0.5, according to the results of the SPSS19.0 analysis. As a result, except for a few points with loud noise, it can be concluded that stepping over is an effective feature. The recognition model of the somersault posture of classical dance is studied in this paper, a database for real-time acquisition of three-dimensional data of human motion is established, and the Google model of human body characteristics is obtained based on feature plane matching of human body posture, all using motion capture technology and few-shot learning. The above data has good reference and application value for improving teachers' teaching level and arousing students' learning enthusiasm in the dance teaching process when applied to posture teaching and analysis. The captured data can convert human motion in real three-dimensional space into data in virtual three-dimensional space. Motion capture technology converts human motion information into a technology that can be recognized by computers.

Feasibility of inducing new intermuscular coordination patterns through an electromyographic signal-guided training in the upper extremity: a pilot study.

Abnormal intermuscular coordination has been highlighted in the field of post-stroke upper extremity (UE) rehabilitation. Relatively recent studies have quantified the altered "muscle synergies", distinctive co-activation patterns of a group of muscles, which characterize the stroke-induced abnormal intermuscular coordination. Nonetheless, whether targeting the altered muscle synergy(ies) would ameliorate the stroke-induced motor impairment and improve motor function remains unknown. Our ultimate aim is to design an exercise protocol that modifies abnormal muscle synergies and improves motor function in UE after stroke. In this study, the feasibility of an electromyographic (EMG) signal-guided exercise protocol, which targeted the alteration of an elbow flexor synergy, was tested in healthy subjects. Four neurologically intact adults participated in a six-week isometric exercise to activate two major elbow flexor muscles, biceps and brachioradialis, in isolation. Participants performed an isometric reaching in a virtual three-dimensional (3D) force space to assess any potential changes in muscle synergies during the assessment at week zero, two, four, and six of the training. EMGs of 12 UE muscles and 3D forces were collected simultaneously. A non-negative matrix factorization (NMF) was applied to the EMGs to identify synergies. From the third-to-fourth week of the training, when the participants intended to use the newly learned motor skill, they were able to activate the targeted muscle pair in isolation and induce the formation of newly emerging synergistic muscle groups. As the participants practiced to expand their repertoire of intermuscular coordination patterns, their motor control of the trained UE was improved. These findings suggest that our isometric exercise protocol can potentially modulate impaired muscle coordination in a way that benefits stroke survivor's performance in activities of daily living (ADLs) and, eventually, their quality of life.

Digital evaluation of the leaf wall area of the grapevine (Vitis vinifera cv. Sauvignon) by using LIDAR measuring technology

A dosage rate reduction of plant protection products mixed with water, i.e. spray mixture, in a prescribed concentration in the vineyard will only be possible in the future, if the natural characteristics of vine canopy structures (leaf wall area) and canopy management are taken into account. In a practical experiment in the vineyard we evaluated the leaf wall area of the vine cv. Sauvignon on different segments on the left and right side of the vine canopy. We compared the results of manual measurements and laser measuring technology (LIDAR) with the corresponding algorithm, with which we enabled the digital reconstruction of the leaf wall area of the vine. The manual measurement of the leaf wall area was carried out using an automated image analyser. The digital system for measuring the leaf wall area on different segments consisted of a LIDAR sensor and a Differential Global Positioning System (hereinafter DGPS). To determine the exact DGPS position of the LIDAR sensor during the measurement, we set up a DGPS base station. Using the Excel software (CORREL function), we estimated the relationship between the dependent variable (digital number of points in the cloud) and an independent variable (leaf wall area, manually measured). An analysis of six randomly selected vines in the vineyard revealed the maximum value of the correlation coefficient r = 0.80 for the left side and r = 0.90 for the right side of the leaf wall area of the vine, respectively. In the near future the virtual three-dimensional space will provide more even control of spray mixture over the entire structure of the leaf wall area in the vineyard based on autonomous decision-making models.

Possibilities of injuries' mathematical modeling of mobile and motionless spleen in case of a blunt object injury

The aim of the work is to establish the possibility of mathematical modeling of the injuries formation in the mobile and fixed spleen under shock impact to the region of the left middle axillary line of the chest. A spleen injury with a pinched and movable vascular pedicle was simulated, for which were created two models in three-dimensional virtual space - the spleen model and the rib-sternum segment model. Differences in the concentration and localization of stresses arising on the spleen were noted in cases of fixed and non-fixed vascular pedicle. It was found that under the same conditions of injury (place of application and direction of the injury, impact force), «critical» stresses that can lead to ruptures occur on the spleen, which has a fixed vascular pedicle.

English language learning by visualizing the literary content of a knowledge base in the three-dimensional space

In our paper we would like to present and visualize the details of the data structure and organization of our three-dimensional virtual library model (3DVLM). The current implementation of the model is based on the features of the three-dimensional virtual space of the MaxWhere Seminar System [23] which provides carefully arranged smartboards in the 3D space for hypertextbased content.

DEED – Design, Entertainment and Education Research Cluster View Activity Log

DEED is a Brazilian research cluster, a formally recognised group of researchers and practitioners whose expertise is applied to the fields of Arts and Design. DEED activities includes, but are not limited to, lectures, study groups, master and Ph.D. researches, seminars, work-in-progress meetings, workshops, networking events, and creative artefacts developments. While working in a research cluster context this can be observed as contributing to new knowledge and gain by means of practice outcomes in a wider community.
 DEED is an acronym for “Design, Entertainment, and Education” and also is a noun that can etymologically means “action”, “activity”, “fact”, “practice”, “deal”, “share”, “feat”, “accomplishment”, “writ”, “muniment”, “tool”, “device”, and “fact”. All of these meanings are potentially related to the scope of the research cluster’s activities, especially those interrelated to practice-based researches and deeds.
 In this text, we will present some initiatives and projects developed in a partnership with “Paço das Artes”, which is an art institution of the Secretariat of Culture and Creative Economy of São Paulo State (Brazil). During its 50 years of existence, the Paço das Artes has played a prominent role in the contemporary art and digital art scene in Brazil. Through this partnership, issues such as “digital museum”, “digital curatorship” and“digital collection” have been providing a broad discussion about the role of creative artefacts as the basis of the contribution to knowledge, and also about the role of research leading to new understandings about practice.
 The first initiative comes in 2016, when Paço das Artes was forced to vacate its headquarters, without having the definition of a new address. On thisoccasion, DEED organized “Games + Art”, an event with an exhibition of experimental games, lectures, and workshops. The event also debuts a work entitled “ExPaço” (a pun between the name “Paço das Artes” and something like “ex-space”). In this work, the public could “walk” through the threedimensional virtual space at the Paço das Artes headquarters, deliberately projected empty and abandoned. This work was also exhibited at the Computer Art Festival from Immersphere Fulldome Festival.
 In 2020, on the occasion of the launch of the new headquarters of Paço das Artes and celebration of its 50 years, DEED develops “Expaço VR”, an experience in Virtual Reality. In this work, the interactor could learn more about the history of Paço das Artes in a virtual tour through the five different headquarters occupied since its foundation. Currently, in addition to a mobile version, DEED is working on an online platform for digital artists based on the “Expaço” developing experience. Future improvements foresee the development of a (native) digital museum by 2022, the year that celebrates the centenary of the Modern Art Week - a turning point event for art in Brazil.

Relationship between hip joint proximity area and sagittal balance parameters: an upright computed tomography study

PurposeA close relationship between sagittal spinal alignment and hip osteoarthritis (OA) has been documented. This study aimed to examine the relationship between hip joint proximity area and sagittal balance parameters in healthy subjects.MethodsThis prospective study enrolled 47 healthy volunteers who underwent 320-detector row upright computed tomography. Acquired data were reconstructed in a virtual three-dimensional space. The proximity area was determined by < 1 mm of the Hausdorff distance between the acetabulum and the femoral head. Volunteers were divided into the anterior and posterior proximity groups depending on the position of the closest area. Sagittal balance parameters [sagittal vertical axis (SVA), T1 spinopelvic inclination (T1-SPi), T1-pelvic angle, pelvic tilt, sacral slope, pelvic incidence, lumbar lordosis, thoracic kyphosis), offset distance between the centre of the acoustic meati (CAM) and C7 plumb line (CAM-C7-offset), and offset distance between the CAM and hip axis (HA) (CAM-HA-offset)] were compared between the two groups using independent sample t test.ResultsThe anterior proximity group (n = 24) had higher SVA (p = 0.016) and T1-Spi (p = 0.015) than the posterior proximity group (n = 23). CAM-HA-offset was higher in the posterior than in the anterior proximity group (p < 0.000). There was no difference in other parameters (p > 0.05).ConclusionThe anterior proximity group had a positive anterior spinal balance; the posterior proximity group may have a more posterior gravity line than the hip joint centre. The anterior spinal balance may contribute to the anterior loading of the hip joint, with known relation with the initiation and onset of hip OA.

A Consideration on Sweetness by 3D CG with Fruits as an Example

Today, there are a lot of images and videos drawn by 3D computer graphics (hereinafter referred to as 3DCG) around us, and 3DCG is permeating our lives [1]. Recently, research and development of 3DCG-related technologies such as 3D printers, AR, and VR have been actively carried out, and further progress in 3DCG can be expected in the future. 3DCG is a technology that creates images and videos by creating objects in a virtual three-dimensional space. CAD, VR, AR, simulators, 3D printers, etc. have been developed as technologies that apply this. One of the reasons why it was applied to such technology is the high expressiveness of 3DCG. It is possible to express various substances such as wood, metal, plastic, and glass, and it is becoming possible to reproduce things that do not have a specific shape, such as flames, smoke, and fluids. One of the researches on such 3DCG technology is digital food, and research is being conducted with the aim of putting it into practical use in the future. Digital food is expected to solve problems related to food freshness management, disposal, new product development simulation, etc., but even with the expressive power of 3DCG, meat and fish are still difficult. I am not good at expressing fresh foods such as vegetables and fruits, and “freshness” and “organic coloring” such as “fresh flowers”. This is one of the issues that cannot be avoided even in the research and development of digital foods and must be solved. In this technology, while understanding the principle of 3DCG, I learned using some software in order to explore what technology is necessary to create a digital food. Also, in learning, we set the goal of “expressing fresh fruits”, which is one of the challenges of digital food, and the gloss of the skin peculiar to fruits, the slight unevenness of the surface, especially the freshness of the cut surface of fruits we focused on reproducing the expression of freshness.

Development and proof of concept of an immersive virtual reality system to evaluate near and far space neglect in individuals after stroke: A brief report.

Unilateral spatial neglect (USN) is defined as impaired attention to sensory stimuli on one side. The symptoms can exist for near and far spaces combined or independently. Thus, it is important to evaluate both possibilities in a clinical environment. To develop a tractable immersive virtual reality (iVR) system that can evaluate both near and far space neglect along with a proof of concept study to determine whether near and far spatial neglect could be described in an actual patient with USN. An object-detecting task was developed in a three-dimensional virtual reality space. The examiner recorded the positional data of objects that were recognized by the patient with USN using coordinate data. The system could be used to detect near and far space neglects in a patient with USN. No side effects such as vertigo were seen during measurement. This patient showed that the angle for recognition was significantly larger for near space than far space, and exhibited a tendency for the angle of recognition to increase with lower height. Our proof of concept study indicated the possibility of applying an evaluation system that separates far and near space neglect using iVR.

About three-dimensional procedure virtual spaces

About three-dimensional procedure virtual spaces

Application Research of Virtual Reality Technology in Landscape Design

With the development of virtual reality technology, its application in various fields of society has become more and more extensive. The application of virtual reality technology in landscape design is a very typical example. Virtual reality technology uses information science and technology to simulate a virtual three-dimensional space, giving people a new sensory experience in terms of sight, hearing and touch. The application of virtual reality technology in landscape design allows people to observe the landscape of three-dimensional space in an all-round and unrestricted manner, which greatly enhances the quality of landscape design, and also enables people to further understand and understand virtual reality technology. However, it should be noted that in the process of applying virtual reality technology for landscape design, virtual reality technology and information technology should be combined to achieve the purpose of three-dimensional image, three-dimensional and system integration technology integration, and then complete the landscape design task. This paper mainly analyzes and studies the application process and characteristics of virtual reality technology in landscape design and the corresponding precautions, in order to better apply virtual reality technology and landscape design.

Imaging Peripheral Nerve Regeneration: A New Technique for 3D Visualization of Axonal Behavior

BackgroundPeripheral nerve assessment has traditionally been studied through histological and immunological staining techniques in a limited cross-sectional modality, making detailed analysis difficult. A new application of serial section electron microscopy is presented to overcome these limitations. MethodsDirect nerve repairs were performed on the posterior auricular nerve of transgenic YFP-H mice. Six weeks postoperatively the nerves were imaged using confocal fluorescent microscopy then excised and embedded in resin. Resin blocks were sequentially sectioned at 100 nm, and sections were serially imaged with an electron microscope. Images were aligned and autosegmented to allow for 3D reconstruction. ResultsBasic morphometry and axonal counts were fully automated. Using full 3D reconstructions, the relationships between the axons, the Nodes of Ranvier, and Schwann cells could be fully appreciated. Interactions of individual axons with their surrounding environment could be visualized and explored in a virtual three-dimensional space. ConclusionsSerial section electron microscopy allows the detailed pathway of the regenerating axon to be visualized in a 3D virtual space in comparison to isolated individual traditional histological techniques. Fully automated histo-morphometry can now give accurate axonal counts, provide information regarding the quality of nerve regeneration, and reveal the cell-to-cell interaction at a super-resolution scale. It is possible to fully visualize and “fly-through” the nerve to help understand the behavior of a regenerating axon within its environment. This technique provides future opportunities to evaluate the effect different treatment modalities have on the neuroregenerative potential and help us understand the impact different surgical techniques have when treating nerve injuries.

Development of a quantitative evaluation system for visuo-motor control in three-dimensional virtual reality space

The process of learning a human’s movement and motor control mechanisms by watching and mimicking human motions was based on visuo-motor control in three dimensional space. However, previous studies regarding the visuo-motor control in three dimensional space have focused on analyzing the tracking tasks along one-dimensional lines or two-dimensional planes using single or multi-joint movements. Therefore, in this study, we developed a new system to quantitatively evaluate visuo-motor control in three-dimensional space based on virtual reality (VR) environment. Our proposed system is designed to analyze circular tracking movements on frontal and sagittal planes in VR space with millimeter level accuracy. In particular, we compared the circular tracking movements under monocular and binocular vision conditions. The results showed that the accuracy of circular tracking movements drops approximately 4.5 times in monocular vision than that in binocular vision on both frontal and sagittal planes. We also found that significant difference can be observed between frontal and sagittal planes for only the accuracy of X-axis in both monocular and binocular visions.

Influence of Foot Position on the Measurement of First Metatarsal Pronation Using the First Metatarsal Axial Radiographs

Category: Other Introduction/Purpose: In hallux valgus (HV) surgery, the importance of correcting first metatarsal (1MT) pronation, as well as correcting adduction, has been increasingly recognized. A 1MT axial radiograph is a simple method to quantify 1MT pronation (see figure). However, this view does not provide the exact axial projection, and 1MT is angled on the image. Furthermore, the 1MT angle is dependent on the foot position and alignment. Therefore the measured pronation angle on the radiograph may not be the same as the “true” pronation along the 1MT long axis. The purposes of this study were to 1) quantify the difference between the measured 1MT pronation on the axial radiograph and the true pronation angle, and 2) determine the influence of foot position on the measurement. Methods: CT images of 10 feet from HV patients (HV group; age, 58 years; HV angle, 44°) and 10 feet from those without HV (non-HV group; age, 47years; HV angle, 12°) were obtained. Digitally reconstructed radiographs of the 1MT were generated from the CT images in a three-dimensional virtual space (see figure). 1MT was pronated along the long axis (true pronation angle). Then, images with different plantarflexion (25° to 35° in 5° increments) and adduction (-10° to 10°) angles were created. This procedure was repeated for different pronation angles (-10° to 30°), and 135 simulated 1MT axial radiographs were obtained from each bone. We measured the 1MT pronation angles in all images. Differences in the measured pronation angle and true pronation angle were calculated for each group. Correlations between the measurement difference and 1MT plantarflexion/adduction angles were assessed using the Spearman correlation coefficient. Results: The mean measurement differences were 0.7° and 1.0° for the HV group and non-HV group, respectively. The standard errors of the measurement were 0.5° and 0.6° for the HV group and non-HV group, respectively. There was no significant correlation between the measurement difference and plantarflexion angle (P = 0.92 and P = 0.92 for the HV group and non-HV group, respectively), nor between the measurement difference and adduction angle (P = 0.82 and P = 0.74). Conclusion: The measurement differences were low in both HV and non-HV feet, indicating that the 1MT pronation angle measured on the axial radiograph represented the true pronation angle along the long axis of 1MT. The measurement differences were consistent regardless of plantarflexion and adduction angles. Therefore, a variation of 1MT angle on the image, which can be caused by the misalignment of foot position while taking the radiograph and difference in foot alignment (such as flatfeet and cavus feet), did not affect the measurement. 1MT axial radiograph could be used as a valid and robust method to quantify 1MT pronation.

3D Virtual museum generation by using SuperSQL

PurposeCurrently, the results of database acquisition are variously expressed, but it seems that users’ understanding degree will be improved by expressing some search results such as images of products of shopping sites in three dimensions rather than two dimensions. Therefore, this paper aims to propose a system for automatically generating 3D virtual museum that arranges 3D objects with various layouts from the acquisition result of relation database by SuperSQL query.Design/methodology/approachThe study extended the SuperSQL to generate 3D virtual reality museum using declarative queries on relational data stored in a database.FindingsThis system made it possible to generate various three-dimensional virtual spaces with different layouts through simple queries.Originality/valueIt can be said that this system is useful in that a complicated three-dimensional virtual space can be generated by describing a simple query and a different three-dimensional virtual space can be generated by slightly changing the query or database content. When creating a virtual museum, if there are too many exhibitions or when changing the layout, the burden on the user will be high. But in this system, it is possible to automatically generate various virtual museums easily and reduce the burden on users.