Towards a Decision Support Tool for 3d Visualisation: Application to Selectivity Purpose of Single Object in a 3d City Scene

Abstract

ABSTRACT:This paper deals with the establishment of a comprehensive methodological framework that defines 3D visualisation rules and its application in a decision support tool. Whilst the use of 3D models grows in many application fields, their visualisation remains challenging from the point of view of mapping and rendering aspects to be applied to suitability support the decision making process. Indeed, there exists a great number of 3D visualisation techniques but as far as we know, a decision support tool that facilitates the production of an efficient 3D visualisation is still missing. This is why a comprehensive methodological framework is proposed in order to build decision tables for specific data, tasks and contexts. Based on the second-order logic formalism, we define a set of functions and propositions among and between two collections of entities: on one hand static retinal variables (hue, size, shape…) and 3D environment parameters (directional lighting, shadow, haze…) and on the other hand their effect(s) regarding specific visual tasks. It enables to define 3D visualisation rules according to four categories: consequence, compatibility, potential incompatibility and incompatibility. In this paper, the application of the methodological framework is demonstrated for an urban visualisation at high density considering a specific set of entities. On the basis of our analysis and the results of many studies conducted in the 3D semiotics, which refers to the study of symbols and how they relay information, the truth values of propositions are determined. 3D visualisation rules are then extracted for the considered context and set of entities and are presented into a decision table with a colour coding. Finally, the decision table is implemented into a plugin developed with three.js, a cross-browser JavaScript library. The plugin consists of a sidebar and warning windows that help the designer in the use of a set of static retinal variables and 3D environment parameters.

A Formalized 3D Geovisualization Illustrated to Selectivity Purpose of Virtual 3D City Model

“…In the first step, the user downloads the 3D model without Figure 7. An application chart (extension version of Neuville et al [79]) for assisting the visualization of selectivity purpose of virtual 3D city models.…”

“…We do not pretend to solve graphical conflicts, but we do believe that with a deep understanding of how 3D geovisualization works, we can at best avoid them and subsequently produce a more efficient visualization of 3D geospatial data. This section aims to present and extend the initial formalism developed by Neuville et al [79]. The insertion of camera settings in the mathematical framework as well as their connections to visualization techniques are new, and enhance the formalization process.…”