Interactive Function-Based Shape Modeling for Cyberworlds

Levinski, Konstantin; Sourin, Alexei

doi:10.1109/cw.2004.41

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…We illustrate it with the ability to import FRep shapes modeled with the interactive function-based shape modeling program described in [Levinski and Sourin 2004]. This program offers an advanced set of interactive operations such as cutting, sculpting, embossing, engraving, and carving.…”

Section: Import Of the Proprietary Frep Modelsmentioning

confidence: 99%

Function-based representation of complex geometry and appearance

Liu

Sourin

2005

Proceedings of the Tenth International Conference on 3D Web Technology

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In this paper, we introduce a function-based extension of Virtual Reality Modeling Language. In this extension, analytical functions are used for defining geometry and appearance of 3D shapes, as well as transformations of them. By analytical functions we understand definitions with parametric, implicit and explicit formulas. In our hybrid function-based web visualization model, these very different analytical representations can be used concurrently for defining geometry and appearance of the shapes. We also illustrate how the proposed extension can be further enriched with any proprietary function-based models. The presented VRML plug-in is very useful for building both static and interactive virtual environments on the Web. This is illustrated with the implementation of the Virtual Collaborative Shape Modeling Laboratory.

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Section: Import Of the Proprietary Frep Modelsmentioning

confidence: 99%

Function-based representation of complex geometry and appearance

Liu

Sourin

2005

Proceedings of the Tenth International Conference on 3D Web Technology

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“…It is often rather difficult to calculate the defining function at a given point in functional definitions of surfaces. For this reason, preliminary surface triangulation is often performed for interactive modeling [25][26]. The available function-based object definition methods are limited to a rather narrow group of modeled surfaces and slow visualization.…”

Section: Problem Statementmentioning

confidence: 99%

Interactive Shape Modeling Using Functionallydefined Objects

Romanyuk,

Vyatkin,

Mykhaylov

et al. 2020

HAIT

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Creating digital models is a complex task in computer graphics. Animation developers usually use two methods. The models are either sculpted from a traditional material such as clay or plasticine, and then the model must be digitized. Models can alsobe created using one of several commercial (or custom) modeling systems, such as MAYA or SoftImage. Since clay can be molded to create smooth surfaces and precise details, most designers very often use this method. It would be useful to give users the same opportunity as modeling from clay or plasticine, but in virtual space. So that the designer can deform the work piece, add details, and remove unnecessary parts. In addition, virtual shopping malls, virtual worlds, scientific visualization, design, construction, and so on,require huge costs to transmit three-dimensional geometric data over the network. This requires a compact description of three-dimensional objects.Considering these requirements, methods were developed with the following features. Innovations in the interactive modeling interface that take advantage of functional model assignment. This is the orientation and positioning of the sculpting tool relative to the surface.The paper describes the interactive modeling of deformation forms of models based on perturbation functions. Such objects are characterized by a high degree of smoothness and are described by a small number of functions. They are easyto deform and create shapes similar to modeling from plasticine. The proposed method of deformation of the functionally based models with fast visualization allows to provide the interactivity and a realistic appearance of the resulting shapes. An interactive modeling of deformations is presented.The process of interactive modeling of geometric shapes defined by perturbation functions is described. A method for interactive modeling of functionally defined objects without preliminary triangulation is proposed. This allows more accurate definition of3D shapes and simplifies the modeling system. The algorithm for finding the minimum common parent for the objects, the algorithm for adding an object (perturbation) to the scene, and the algorithm for selecting the objects in the scene were developed for this purpose. A method for visual representation of free forms and analytical perturbations for interactive modeling is developed. An interactive scene editor has been created with the ability to save the result both as a scene file and as a bitmap image. The set of primitives for constructing scenes has also been expanded, and the properties of new primitives have been investigated. When creating the editor, work was done to optimize the rasterization algorithm. A method adapted for graphic processing units is used for rapid rendering of 3D models. The considered scientific problem can be used to facilitate the modeling of 3-dimensional surfaces with different types of deformations, which can be relevant for solving applied problems.

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“…This bot is an avatar of one of the project students who contributed a lot to the Virtual Campus. Its "brain" is developed using AIML language, ALICE files (http://www.alicebot.org), and computer graphics terms from the text book (Sourin, 2004), which this bot is incidentally selling to the current computer graphics students. Besides maintaining simple conversations, this cyber-instructor can quickly answer questions of computer graphics and virtual reality.…”

Section: Fig 1 a Snapshot Of The Virtual Campusmentioning

confidence: 99%

“…Also, the synergy of using the three different representations results in the advance quality and efficient solutions, which are impossible to achieve when these representations are used on their own. The theoretical foundations and further details of this hybrid approach to function-based shape modeling can be found in (Liu andSourin, 2005 andLevinski andSourin, 2004) as well as in the project web pages.…”

Section: Case 2: Interactive Function-based Shape Modelingmentioning

confidence: 99%

Cyber-Learning in Cyberworlds

Sourin

Sourina

Prasolova‐Førland

2006

Journal of Cases on Information Technology

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This paper discusses the problems of teaching computer graphics and shape modeling in large and distributed classes using visual cyberworlds-shared media rich information worlds built on the web. Cyberworlds allow for providing personal mentoring to the students with different cultural and educational backgrounds. Virtual Campus of Nanyang Technological University is such a cyberworld, which is being used for teaching computer graphics and shape modeling. A part of this cyberworld is the Virtual Shape Modeling Laboratory. It is used by the computer graphics students for designing geometric shapes defined with analytical formulas. Augmenting the existing ways of electronic education with cyberworlds appears to be useful which was proved by the final exam results and overall attitude of the students. ORGANIZATION BACKGROUND "Nanyang" in Chinese means "south seas"-a reference to the Southeast Asian region. Back in the 1940s and 50s, many Chinese from mainland China ventured south to seek their fortunes in new lands. Malaya-now Singapore and Malaysia-was then known as "Nanyang" to the Chinese. After World War II, it was decided to start a university in Singapore that would provide tertiary education in Chinese in the region. On 23 March 1953, 523 acres of land was donated to the new Nanyang University, which was known as "Nan Tah" in Chinese. The modern Nanyang Technological University (NTU) (http://www.ntu.edu.sg) originated from Nan Tah. It is a comprehensive University designed to meet the needs of Singapore and the region. The University offers undergraduate and graduate courses in different areas of Accountancy and Business; Art, Design and Media; BioEngineering; Biological Sciences;

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Interactive Function-Based Shape Modeling for Cyberworlds

Cited by 10 publications

References 14 publications

Function-based representation of complex geometry and appearance

Function-based representation of complex geometry and appearance

Interactive Shape Modeling Using Functionallydefined Objects

Cyber-Learning in Cyberworlds

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