A Topological Framework for Interactive Queries on 3D Models in the Web

Author:

Figueiredo Mauro12,Rodrigues José I.12,Silvestre Ivo1,Veiga-Pires Cristina13

Affiliation:

1. Centro de Investigação Marinha e Ambiental (CIMA), Portugal

2. Instituto Superior de Engenharia, Universidade do Algarve, 8005-139 Faro, Portugal

3. Faculdade de Ciências e Tecnologia, Universidade do Algarve, 8005-139 Faro, Portugal

Abstract

Several technologies exist to create 3D content for the web. With X3D, WebGL, and X3DOM, it is possible to visualize and interact with 3D models in a web browser. Frequently, three-dimensional objects are stored using the X3D file format for the web. However, there is no explicit topological information, which makes it difficult to design fast algorithms for applications that require adjacency and incidence data. This paper presents a new open source toolkit TopTri (Topological model for Triangle meshes) for Web3D servers that builds the topological model for triangular meshes of manifold or nonmanifold models. Web3D client applications using this toolkit make queries to the web server to get adjacent and incidence information of vertices, edges, and faces. This paper shows the application of the topological information to get minimal local points and iso-lines in a 3D mesh in a web browser. As an application, we present also the interactive identification of stalactites in a cave chamber in a 3D web browser. Several tests show that even for large triangular meshes with millions of triangles, the adjacency and incidence information is returned in real time making the presented toolkit appropriate for interactive Web3D applications.

Funder

Portuguese government and EU-Funding through the Fundação para a Ciência e Tecnologia FCT

Publisher

Hindawi Limited

Subject

General Environmental Science,General Biochemistry, Genetics and Molecular Biology,General Medicine

Reference10 articles.

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