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A point-based system for local and remote exploration of dense 3D scanned models

Alex Tinti

2011

Abstract

Today’s 3D laser scanning technologies and digital photography techniques allow to easily acquire multi-million points models at a sub-millimetric detail, providing a hi-quality digital representation of the object of interest. Unfor tunately, standard rendering algorithms are not capable to deal, at run-time, with a such huge amount of data on commodity graphic platforms and often just a coarse grained low-res model can be shown to the end-user. This thesis focuses on a client-server system for real-time point based rendering and network distribution of large 3D models on low-end platforms. Rendering strategy is based on a hierarchical multi-resolution structure, a BSP tree, composed by compressed nodes with thousands of point samples. Nodes are built in a 2-phases process: the first phase extracts leaf nodes from the raw input dataset; the second instead, starting from leafs, builds inner nodes by merging and filtering pairs of children to obtain the parent node, until the unique root is constructed. The actual view dependent representation of the multi-resolution model gets incrementally updated at run-time by an adaptive refinement process that fetches from the local or remote out-of-core multi-resolution structure dataset. Vertex and fragment shaders are used to render the GPU cached model representation with a hi-quality elliptical sample drawing and for other several shading effects. Single-touch user interface, which allows end-users the model inspection, includes a bidirectional-hyperlink system to access to remote multimedia con- tents, connecting different parts of 3D model to several information sources. Area, distance and angle measurements instruments have also been implemented as well as more common tools like model, camera and light control. The system can provide an effortless exploration of hi-detailed 3D models, from small artifacts to larger sites and can be distributed as web-plugin, stand-alone application or even as museal kiosk installation, to be placed next to the real 3D artwork in order to improve visitor’s experience.

Reference and download information

Alex Tinti. A point-based system for local and remote exploration of dense 3D scanned models. Master's thesis. Dept. of Mathematics and Informatics, University of Cagliari, Italy, 2011.

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Bibtex citation record

@MastersThesis{Tinti:2001:PSL,
    author = {Alex Tinti},
    title = {A point-based system for local and remote exploration of dense 3D scanned models},
    school = {Dept. of Mathematics and Informatics, University of Cagliari, Italy},
    year = {2011},
    abstract = { Today’s 3D laser scanning technologies and digital photography techniques allow to easily acquire multi-million points models at a sub-millimetric detail, providing a hi-quality digital representation of the object of interest. Unfor tunately, standard rendering algorithms are not capable to deal, at run-time, with a such huge amount of data on commodity graphic platforms and often just a coarse grained low-res model can be shown to the end-user. This thesis focuses on a client-server system for real-time point based rendering and network distribution of large 3D models on low-end platforms. Rendering strategy is based on a hierarchical multi-resolution structure, a BSP tree, composed by compressed nodes with thousands of point samples. Nodes are built in a 2-phases process: the first phase extracts leaf nodes from the raw input dataset; the second instead, starting from leafs, builds inner nodes by merging and filtering pairs of children to obtain the parent node, until the unique root is constructed. The actual view dependent representation of the multi-resolution model gets incrementally updated at run-time by an adaptive refinement process that fetches from the local or remote out-of-core multi-resolution structure dataset. Vertex and fragment shaders are used to render the GPU cached model representation with a hi-quality elliptical sample drawing and for other several shading effects. Single-touch user interface, which allows end-users the model inspection, includes a bidirectional-hyperlink system to access to remote multimedia con- tents, connecting different parts of 3D model to several information sources. Area, distance and angle measurements instruments have also been implemented as well as more common tools like model, camera and light control. The system can provide an effortless exploration of hi-detailed 3D models, from small artifacts to larger sites and can be distributed as web-plugin, stand-alone application or even as museal kiosk installation, to be placed next to the real 3D artwork in order to improve visitor’s experience. },
    url = {http://vic.crs4.it/vic/cgi-bin/bib-page.cgi?id='Tinti:2001:PSL'},
}