Development Of 3D Applications Research Articles

3QNet

Since the development of 3D applications, the point cloud, as a spatial description easily acquired by sensors, has been widely used in multiple areas such as SLAM and 3D reconstruction. Point Cloud Compression (PCC) has also attracted more attention as a primary step before point cloud transferring and saving, where the geometry compression is an important component of PCC to compress the points geometrical structures. However, existing non-learning-based geometry compression methods are often limited by manually pre-defined compression rules. Though learning-based compression methods can significantly improve the algorithm performances by learning compression rules from data, they still have some defects. Voxel-based compression networks introduce precision errors due to the voxelized operations, while point-based methods may have relatively weak robustness and are mainly designed for sparse point clouds. In this work, we propose a novel learning-based point cloud compression framework named 3D Point Cloud Geometry Quantiation Compression Network (3QNet), which overcomes the robustness limitation of existing point-based methods and can handle dense points. By learning a codebook including common structural features from simple and sparse shapes, 3QNet can efficiently deal with multiple kinds of point clouds. According to experiments on object models, indoor scenes, and outdoor scans, 3QNet can achieve better compression performances than many representative methods.

Development of a digital educational platform for studying radio engineering courses

The main tasks solved with the help of a digital educational platform with interactive learning opportunities are a remote process of obtaining knowledge, providing permanent access to educational materials, and monitoring the level of students’ performance. This paper considers the development of a digital educational platform for the remote study of modern Ultra high frequency (UHF) and Extremely high frequency (EHF) radio systems. The architecture of the developed platform is a client-server. The server part includes a database of collected laboratory results, and the client part is responsible for displaying and outputting the necessary information. The list of virtual labs that are part of the educational platform, as well as devices and measuring instruments used in the virtual laboratory is presented. An example of a lab with remote access implemented using the Unity 3D application development tool is given. This digital educational platform will be used by students of the «Radio Engineering, Electronics and Telecommunications» educational program to study radio engineering courses. It is shown that the use of virtual laboratory work in the educational process can replace real expensive equipment, as well as consolidate practical skills in training.

ПРИМЕНЕНИЕ МЕТОДОВ ИСКУССТВЕННОГО ИНТЕЛЛЕКТА В 3D-ТРЕНАЖЕРАХ НА ОСНОВЕ ФУНКЦИОНАЛЬНО-ЛОГИЧЕСКИХ МОДЕЛЕЙ

The article presents an approach to the use of artificial intelligence methods in the development of imitation professional simulators. The analysis of the use of artificial intelligence tools for the development of 3D applications is carried out, typical components and their functions are considered, the drawbacks that limit the use of these methods in professional simulators are revealed. The proposed approach is based on adapting these standard tools and supplementing them with functional-logical models that perform control functions. As an example, the implementation of the approach in the Unity cross-platform development environment is proposed. The results of the work have been tested in the development of simulators in the field of labor protection.

Browser based 3D for the built environment

Digital 3D geometric models have become a central tool for geo-information. For many participatory and collaborative applications, distributing these models easily is essential. Several technical solutions exist for creating online systems that facilitate the study of 3D models in the context of the built environment. To provide an overview on browser based interactive 3D visualizations, we present a set of existing systems applied in Finland, and discuss their common properties and differences. To obtain first-hand experience, we experiment with an online 3D application development platform. The systems studied show a high potential for browser based 3D applications: interactive visualizations with multi-user characteristics and dynamic elements can be built by leveraging the 3D web technologies. Finally, we suggest a framework for discussing browser based 3D systems, covering the spectrum of possibilities available in modern web-based 3D for built environment applications.

Depth camera indoor mapping for 3D virtual radio play

AbstractBy combining game engines with indoor mapping, it is possible to create interactive virtual environments that represent the real world. In this paper a virtual version of an audio installation in a historic building is produced, where the user freely explores the building and experiences a set of audio clips, creating a virtual radio play. A depth camera indoor mapping system, Matterport, captured a set of staged interiors. The aim was to evaluate the quality and usability of the indoor models and to demonstrate applying them in 3D application development. The quality of the models was evaluated by comparison with laser scanning, revealing limitations with Matterport: increasing the size of the measured area lowered the level of detail and accuracy of volumetric models. The quality of textures was not affected by this limitation, maintaining the appearance of models. To obtain optimised models for mobile 3D applications, a manual revision process was applied.

Structured development of 3D applications: round-trip engineering in interdisciplinary teams

While structured software development processes are nowadays common-place, 3D applications are often still developed in an ad-hoc and code-centric manner. This state of affairs is somewhat surprising, as there are many benefits to a more structured 3D development process. In particular, model-based techniques with support for iterative development could help to ensure the mutual consistency of the code bases produced by the heterogeneous developer groups, i.e. 3D content developers and programmers. However, a cultural gap exists between 3D content developers and programmers who use completely different tools and terminologies. Common tools for model-driven development, for instance based on UML, are inadequate for the often "creatively oriented" 3D content developers. This paper presents a model-driven approach for the structured development of 3D applications in interdisciplinary teams based on round-trip engineering. Abstract models of the application are specified in SSIML, a DSL tailored for the development of 3D applications. In a forward phase, consistent skeletons of 3D scene models and program code are generated from the SSIML model. In a reverse phase, refinements of both the 3D scene model and program code are abstracted and synchronized to result in an updated SSIML model. This process is repeated in the subsequent iterations. Several examples of 3D application development on diverse platforms including Web, immersive virtual reality, and augmented reality on mobile devices demonstrate the versatility of our approach.