Interactive Roaming Research Articles

Application of Computer 3D Modeling Technology in Modern Garden Ecological Landscape Simulation Design

The use of digital technology (DT) to systematically plan and design UL can further progress the urban environment. Digital landscape as a new vector of landscape planning and design is oriented to DT. The promotion of DT improves the science and accuracy of UL planning and designs and promotes sustainable development. A city in the south was used as an example to reconstruct and restore the historical appearance of the city from four aspects: virtual process, reconstruction method, digital construction, and virtual interactive roaming technology, and a new way was found for the application of digital landscape in urban construction. The scientific and creative nature of UL is becoming increasingly prominent as the digital era progresses, and UL is no longer just an exterior manifestation of artistic configuration but also a humanized spatial combination guided by data analysis.

A Human-Computer Interaction System for Agricultural Tools Museum Based on Virtual Reality Technology

Traditional museums and most digital museums use window display to exhibit their collections. However, the agricultural tools are distinctive for their use value and wisdom contained. Therefore, this paper first proposes a method of virtual interactive display for agricultural tools based on virtual reality technology, which combines static display and dynamic use of agricultural tools vividly showing the agricultural tools. To address the problems of rigid interaction and terrible experience in the process of human-computer interaction, four human-computer interaction technologies are proposed to design and construct a more humanized system including intelligent scenes switching technology, multichannel introduction technology, interactive virtual roaming technology, and task-based interactive technology. The evaluation results demonstrate that the system proposed achieves good performance in fluency, instructiveness, amusement, and practicability. This human-computer interaction system can not only show the wisdom of Chinese traditional agricultural tools to the experiencer all over the world but also put forward a new method of digital museum design.

An Efficiency Control Method Based on SFSM for Massive Crowd Rendering

For massive crowds, users often have the need for interactive roaming. A good roaming effect can make the user feel immersed in the crowd, and the scenes need to be populated with crowds of people that make the environment both alive and believable. This paper proposes a method of efficiency control for massive crowd rendering. First, we devise a state machine mechanism based on self-feedback, which can dynamically adjust the accuracy of crowd model rendering according to the relationship between the speed of the system rendering and the speed the users expect. Second, we propose a movement frequency update method to perform the frequency of motion update based on the distance between the individual and the viewpoint. In addition, we propose a variable precision point sampling drawing strategy to render the individual with different sampling precision. The state machine system in this paper effectively integrates two core technologies for dynamically controlling the accuracy of the model, ensuring visual efficiency, improving the rendering efficiency, and satisfying the fluency of users’ roaming interaction.

Development of high-immersive simulation system for designing maintenance strategy and its application to CLEAR-I

The maintenance strategy is imperative and important to be considered in the design process of advanced nuclear reactor as early as possible. The design and validation of the maintenance strategy are key challenges which remain to be resolved due to the complex mechanical structure, the expensive physical mockup, and the potential risk of radiation hazards. In this paper, a high-immersive interactive simulation system has been developed to simulate and verify maintenance strategy by using virtual reality. Main features include: (1) rapid modeling and real-time rendering of the large-scale three-dimensional radiation scene, (2) real-time interactive roaming by tracking the 6-DOF body motion, (3) the interactive disassembly simulation of the mechanism structure were controlled by the hand gestures. The system can provide designers with an intuitive experience environment, an efficient and flexible interactive way as well as the whole process simulation of maintenance strategy. It has been applied to simulate and verify the maintenance strategy of the spallation target proton beam window for China LEAd-based research Reactor (CLEAR-I). The simulation result proved the maintenance strategy of proton beam window was reasonable and feasible. The system was useful to verify maintenance strategy, optimize maintenance operation, reduce intervention time and exposure dose of workers. It provided a high efficiency and low cost way for simulating maintenance strategy to meet the requirements of ALARA rules and can be extended to other nuclear facilities.

Realizes 3D Simulation of Campus Construction Based on Virtual Reality

Virtual reality (VR) technology is a new and comprehensive application of information technology. It can make people get the same feeling such as in the real world. VR has become one of the three major means of human exploration of the objective world rule. As one of the key technologies of building digital multi-dimensional information space technology support platform, virtual reality technology in the development and application domain expands unceasingly. This paper designs and realizes a 3D virtual campus roaming system based-VRML and mainly studies the key technology of overall modeling and local modeling, then achieves virtual campus interactive roaming function Using VRML development tool. The paper provides some experience for virtual reality technology in simulation campus construction in the areas of application.

Development of Virtual Repair Training System of Transmission

Aiming at the problem on complex structure and lack of effective training methods of the transmission developed a set of transmission interactive virtual maintenance training system. Used the software of Solidworks and 3D MAX to build a virtual prototype of the transmission, and then making simplification and rendering, by converting the coordinate system and the viewpoint to achieve the construction of virtual assembly environment. By controlling the node and the demolition path in EON, the virtual interactive simulation is achieved. Through collision the detection and path settings, the virtual interactive roaming is achieved. Determined the scoring rules, scoring criteria, assessment standards and other key technologies, achieved four functions of demonstration, learning, training and assessment. It has a great practical significance to improve the training effect, effectively solved the high cost of training, teaching efficiency and other issues.

Implementation Technologies and Procedure of the Real-time Interactive Roaming System of Virtual City

Virtual reality is a hot research topic in computer science and the introduction of virtual roaming to the field of urban planning provides a new means for urban design. This paper analyzes the development, features and technology of virtual reality and the virtual city roaming and its applications and advantages in urban planning; then focus on key tech- nologies and how to implement a real-time interactive virtual city roaming system, taking example of the scene develop- ment software Vega, and finally concludes the importance of virtual city roaming in urban planning. A virtual city is a concept proposed after digital city. A digital city is digitization, networking and visualization of urban geography, environment, resources, population, econ- omy and various social services in order to optimize decision support. While a virtual city is a manifestation used for de- scription and a virtual reproduction, the operating environ- ment and interactive interface of a digital city and a means of true three-dimensional display of city information. From the base layer to the application layer and to the decision-making layer, a virtual city participates in each layer of a digital city. The virtual city roaming replaces traditional maps to ex- plain, describe, analyze and discuss design ideas and urban progress, presents a city vividly in front of people, provides an immersive environment for urban development and the application of geographic information and enables users to move and interact in it. It enables users to visually see the urban street scope, to autonomously roam in the three- dimensional scene and to undertake operations such as query, measurement and flight browsing, so as to understand the direction of future planning and development of enterprises, building districts and even cities as well as to provide visual- ized geospatial information services for urban construction planning, community services, property management, tour- ism, transportation, fire safety and so on. This paper introduces a virtual city roaming system, makes comparative analysis of other computer-aided methods com- monly used in urban planning and design, researches the com- position, key technologies and realizing methods of the virtual city roaming and makes a detailed description of the process and technologic route to achieve the virtual city roaming sys- tem with MutligenVega. Finally, it makes a brief summary of the application and significance of virtual reality roaming technology in the field of urban construction.

Research on Virtual Reality Technology Based the Application System of the Pumping Unit

The pumping unit is designed and assembled collaboratively by using virtual reality technology combining with the UG and VAPlatform. A simulation roaming system of the field scene is established which uses Nvision platform and 3Dmax. The system is based on the real working condition to enhance the sense of reality, uses interactive roaming mode, observes the objects in the virtual environment from any point of view, and reproduces the working state of the pumping unit in the oil field, which provides reference value for the complex mechanical production.

Design and Realization of Virtual Classroom

Virtual Reality (VR) simulations are excellent tools for training, education, simulation of abnormal and dangerous conditions in mines and solving complex problems. This paper introduces some technology about using VRML to construct 3D virtual scene and its interactive roaming by Virtual classroom environment’s researching and practice. This paper introduces the virtual classroom development process, and elaborates the key technologies of virtual classroom’s geometry modeling，texture mapping, interactive behavior design and so on, and discusses how to reduce the VRML file, and how to improve the rendering speed of VRML file in order to optimize system performance to construct a lifelike Virtual classroom.

A Flexible Multi-Volume Shader Framework for Arbitrarily Intersecting Multi-Resolution Datasets

We present a powerful framework for 3D-texture-based rendering of multiple arbitrarily intersecting volumetric datasets. Each volume is represented by a multi-resolution octree-based structure and we use out-of-core techniques to support extremely large volumes. Users define a set of convex polyhedral volume lenses, which may be associated with one or more volumetric datasets. The volumes or the lenses can be interactively moved around while the region inside each lens is rendered using interactively defined multi-volume shaders. Our rendering pipeline splits each lens into multiple convex regions such that each region is homogenous and contains a fixed number of volumes. Each such region is further split by the brick boundaries of the associated octree representations. The resulting puzzle of lens fragments is sorted in front-to-back or back-to-front order using a combination of a view-dependent octree traversal and a GPU-based depth peeling technique. Our current implementation uses slice-based volume rendering and allows interactive roaming through multiple intersecting multi-gigabyte volumes.

Transect-based three-dimensional road modeling and visualization

On the basis of the study on road elements and the existing three-dimensional road data models, this paper puts forward the transect-based road modeling, resolves the modeling of the simplest road with two road transects, and fulfils the visualization of the road. OpenGL is applied as the tool of visualization. The map texture technology, LOD algorithm and dynamic multi-differentiating texture technology are of benefit to the construction of 3D road GIS, and improve the speed of roaming and effective visualization. This paper also disusses the combination of 2D digitall road map and 3D road scene, and the dynamic response between them. Finally, on the basis of the research on the transect-based road model, this paper develops the three-dimensional road geographic information system called virtual road (VRoad), which not only supplies road designers with a set of tool which can turn the designed 2D road data into 3D road and the high road assistant function area in computer, but also supplies the road management with a set of tool which can realize the road real time and interactive roaming, high-efficiency management.

Multidimensional interactive display of CT and MRI data

This paper presents a technique for the multiplanar display and manipulation of standard CT and MRI data. Using this interactive tool one can display axial, coronal, and sagittal plane from standard CT or MRI data sets, as well as selecting arbitrary oblique planes. This system uses a bi-cubic interpolation technique to produce high quality reformatted images. The tool allows interactive roaming of the CT or MRI data volume and facilitates communication between the radiologist and the referring physician.