Information theory tools for viewpoint selection, mesh saliency and geometry simplification

In this chapter we review the use of an information channel as a unified framework for viewpoint selection, mesh saliency and geometry simplification. Taking the viewpoint distribution as input and object mesh polygons as output vectors, the channel is given by the projected areas of the polygons over the different viewpoints. From this channel, viewpoint entropy and viewpoint mutual information can be defined in a natural way. Reversing this channel, polygonal mutual information is obtained, which is interpreted as an ambient occlusion-like quantity, and from the variation of this polygonal mutual information mesh saliency is defined. Viewpoint entropy, viewpoint Kullback-Leibler distance, and viewpoint mutual information are then applied to mesh simplification, and shown to compare well with a classical geometrical simplification method

A Tool for the Creation and management of level-of-detail models for 3D applications

Real-time visualization of 3D scenes is a very important feature of many computer graphics solutions. Current environments require complex scenes which contain an increasing number of objects composed of thousands or even millions of polygons. Nevertheless, this complexity poses a problem for achieving interactive rendering. Among the possible solutions, stripification, simplification and level of detail techniques are very common approaches to reduce the rendering cost. In this paper, we present set of techniques which have been developed for offering higher performance when rendering 3D models in real-time applications. Furthermore, we also present a standalone application useful to quickly simplify and generate multiresolution models for arbitrary geometry and for tree

Multiresolution Foliage Rendering

Ponència presentada en CoSECiVi 2020, VI Congreso de la Sociedad Española para las Ciencias del Videojuego On-line, 7-8 d'octubre de 2020.This work presents a continuous level of detail representation of foliage of trees. Multiresolution modeling allows to adapt the number of polygons to render to the relevance of the object in the scene. However, foliage is represented by isolated polygons, so most of the multiresolution modeling methods do not work properly with this part of the tree. This paper presents a multiresolution model that allows to adapt the number of leaves to the relevance of the foliage in the scene. The criterion to select the appropriate leaves to render is based on a previously performed view-driven simplification. To adapt this parameter in real time, data structures and the necessary algorithms that allow us to extract the appropriate number of polygons are presented. Some tests have been developed to evaluate the proposed solution and results show the good performance of the presented continuous level of detail

An Approach to Relate Viewpoints and Modeling Languages

The architectural design of distributed enterprise applications from the viewpoints of different stakeholders has been proposed for some time, for example, as part of RM-ODP and IEEE 1471, and seems now-a-days to gain acceptance in practice. However, much work remains to be done on the relationships between different viewpoints. Failing to relate viewpoints may lead to a collection of viewpoint models that is inconsistent, and may therefore lead to an incorrect implementation. This paper defines an approach that helps designers to relate different viewpoints to each other. Thereby, it helps to enforce the consistency of the overall design. The results of this paper are expected to be particularly interesting for Model Driven Architecture (MDA) projects, since the proposed models can be used for the explicit definition of the models and relationships between models in an MDA trajectory

Process and IT (Editorial)

Purpose – This paper’s aim is to provide a fresh perspective on how to address process improvement and information technology (IT) in an integrated fashion in order to improve the efficiency of the construction process. Design/methodology/approach –This paper looks at the problems associated with the “conventional” way of addressing IT within construction, and suggests improvements based on integrating three core organisational resources: people, process and technology. Findings – The existing view that IT on its own brings organisational benefits leads to only marginal improvements in organisational efficiency if not resulting in negative impact. However, by correctly integrating people, process and IT initiatives, significant benefits can be achieved. Originality/value – This paper provides value by providing a conceptualisation for addressing people, process and technology within the construction sector

06221 Abstracts Collection -- Computational Aestethics in Graphics, Visualization and Imaging

From 28.05.06 to 02.06.06, the Dagstuhl Seminar 06221 ``Computational Aesthetics in Graphics, Visualization and Imaging\u27\u27 was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available

3D Mesh Simplification. A survey of algorithms and CAD model simplification tests

Simplification of highly detailed CAD models is an important step when CAD models are visualized or by other means utilized in augmented reality applications. Without simplification, CAD models may cause severe processing and storage is- sues especially in mobile devices. In addition, simplified models may have other advantages like better visual clarity or improved reliability when used for visual pose tracking. The geometry of CAD models is invariably presented in form of a 3D mesh. In this paper, we survey mesh simplification algorithms in general and focus especially to algorithms that can be used to simplify CAD models. We test some commonly known algorithms with real world CAD data and characterize some new CAD related simplification algorithms that have not been surveyed in previous mesh simplification reviews.Siirretty Doriast