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Very large triangle meshes, i.e. meshes composed by millions of faces, are becoming common in many applications. Obviously, these complex meshes introduce severe overhead in transmission, rendering, processing and archival. Mesh... more
Very large triangle meshes, i.e. meshes composed by millions of faces, are becoming common in many applications. Obviously, these complex meshes introduce severe overhead in transmission, rendering, processing and archival. Mesh simplification and LOD management have become a mature technology that in many cases can efficiently reduce the above overhead. But none of the available systems can manage meshes characterized
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We present a methodology, based on 3D scanned digital models, for measurement and monitoring wood deformations, caused by weather changes, in the trees of the fossilized Dunarobba forest. The Dunarobba forest, located in the central part... more
We present a methodology, based on 3D scanned digital models, for measurement and monitoring wood deformations, caused by weather changes, in the trees of the fossilized Dunarobba forest. The Dunarobba forest, located in the central part of Italy, was discovered recently after some excavations to dig clay for bricks manufacturing. The removal of the clay mass exposed the wood to the weather conditions, initiating a process of degradation. Different conservation methodologies have been proposed and the choice of the best fitting one has to be validated by means of an objective and measurable methodology. Monitoring the geometric variation of the wood trunks trough comparison of periodic 3D scanning campaign will be used to evaluate the current degradation rate and assess the effectiveness of the proposed conservation techniques.
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Massive data sets coming from complex simulations are "unwill- ing" to fit completely inside computer's internal memory. Co n- sequently it is increasingly more difficult to visualize sim ulations results interactively. The... more
Massive data sets coming from complex simulations are "unwill- ing" to fit completely inside computer's internal memory. Co n- sequently it is increasingly more difficult to visualize sim ulations results interactively. The use of smart External Memory (EM) al- gorithm becomes a must. To address these issues we propose an elegant and simple to implement framework for performing out- of-core
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In this paper, we initiate a study of shape description and classification via the application of persistent homologyto two tangential constructions on geometric objects. Our techniques combine the differentiating power ofgeometry with... more
In this paper, we initiate a study of shape description and classification via the application of persistent homologyto two tangential constructions on geometric objects. Our techniques combine the differentiating power ofgeometry with the classifying power of topology. The homology of our first construction, the tangent complex, can distinguish between topologically identical shapes with different" sharp" features, such as corners. To capture" soft" curvature-dependent features, we define a second complex, the filtered tangent ...
ABSTRACT These tutorial notes provide an introduction, review, and discussion of the state-of-the-art on simplification methods, Level Of Detail, and multiresolution models for surface meshes, and of their applications. The problem of... more
ABSTRACT These tutorial notes provide an introduction, review, and discussion of the state-of-the-art on simplification methods, Level Of Detail, and multiresolution models for surface meshes, and of their applications. The problem of approximating a surface with a triangular mesh is formally introduced, and major simplification techniques are classified, reviewed, and compared.
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Abstract In this paper, we present an interactive system for visualization of three-dimensional scalar fields. The system has been designed in order to overcome some of the problems posed by very large volume data sets. The adopted... more
Abstract In this paper, we present an interactive system for visualization of three-dimensional scalar fields. The system has been designed in order to overcome some of the problems posed by very large volume data sets. The adopted solution exploits an efficient multiresolution data structure based on a tetrahedral domain decomposition. The mesh to be rendered can be selectively refined over areas that the user considers more critical, on the basis of either field values or domain locations. The system supports different rendering ...
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This paper shows how to improve the results of a 3D scan-ning system to allow to better fit the requirements of the Multi-Media and Cultural Heritage domains. A real-time in-hand scanning system is enhanced by further processing its... more
This paper shows how to improve the results of a 3D scan-ning system to allow to better fit the requirements of the Multi-Media and Cultural Heritage domains. A real-time in-hand scanning system is enhanced by further processing its intermediate data, with the goal of producing a digital 3D model with a high quality color texture and an improved representation of the high-frequency shape detail. The pro-posed solution starts from the usual output of the scanner, a 3D model and a video sequence gathered by the scanner sensor, for which the rigid motion is known at each frame. The produced color texture is deprived of the typical artifacts that generally appear while creating textures from several pictures: ghosting, shadows and specular highlights. In the case of objects made of diffuse materials, the system is also able to compute a normal map, thus improving the geometry acquired by the scanner. Re-sults demonstrate that our texturing procedure is quite fast (a few min-utes to proc...
Automatic shape acquisition technologies evolved rapidly in recent years, and huge mass of 3D data can be easily produced. The high accuracy of range scanning technology makes the Cultural Heritage domain one of the ideal fields of use of... more
Automatic shape acquisition technologies evolved rapidly in recent years, and huge mass of 3D data can be easily produced. The high accuracy of range scanning technology makes the Cultural Heritage domain one of the ideal fields of use of these devices. Given this particular application domain, two issues arise: how to visualize at interactive rates these complex data on commodity computers (both locally and on web), and how to improve the ease of use of the visualization tools (as potential users are often not expert with interactive graphics). We present a new visualization system designed to support easy implementation of multimedia kiosk for museums or expositions, which has also been extended to web-based usage. The system allows naive users to inspect a large complex D model at interactive frame rates on off-the-shelf PC's, presenting the D model and all the multimedia data that has been linked to selected points of its surface. A main goal in the design of the system was ...
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The remote visualization and navigation of 3D data directly inside the web browser is becoming a viable option, due to the recent efforts in standardizing the components for 3D rendering on the web platform. Nevertheless, handling complex... more
The remote visualization and navigation of 3D data directly inside the web browser is becoming a viable option, due to the recent efforts in standardizing the components for 3D rendering on the web platform. Nevertheless, handling complex models may be a challenge, especially when a more generic solution is needed to handle different cases. In particular, archeological and architectural models are usually hard to handle, since their navigation can be managed in several ways, and a completely free navigation may be misleading and not realistic. In this paper we present a solution for the remote navigation of these dataset in a WebGL component. The navigation has two possible modes: the ”bird’s eye” mode, where the user is able to see the model from above, and the ”first person” mode, where the user can move inside the structure. The two modalities are linked by a point of interest, that helps the user to control the navigation in an intuitive fashion. Since the terrain may not be fla...
The paper deals with the parallelization of Delaunay triangulation algorithms, giving more emphasis to pratical issues and implementation than to theoretical complexity. Two parallel implementations are pre- sented. The first one is built... more
The paper deals with the parallelization of Delaunay triangulation algorithms, giving more emphasis to pratical issues and implementation than to theoretical complexity. Two parallel implementations are pre- sented. The first one is built on DeWall, an Ed triangulator based on an original interpretation of the divide & conquer paradigm. The second is based on an incremental construction algorithm. The paral-
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This paper presents the initial results of the "Minerva Project" obtained by means of two different 3D scanning techniques. The Minerva of Arezzo is a bronze statue (Archaeological Museum in Florence) currently under... more
This paper presents the initial results of the "Minerva Project" obtained by means of two different 3D scanning techniques. The Minerva of Arezzo is a bronze statue (Archaeological Museum in Florence) currently under restoration. The "Minerva project" intends to show how 3D techniques can integrate standard diagnostic methods giving useful and powerful tools to the restorers. The main goal of the project is to build complete 3D digital models of the Minerva statue, before, during and after restoration in order to monitor the various phases of the restoration process. The case study is very stimulating, because variations of the shape (removal of plaster, polishing of the corroded bronze surface) and of the colour (removal of the thick paint film on the bronze surface) of the statue are forecasted. In this work we also discuss the experience we get and the problems encountered during the project. KEYWORDS: digital models, 3D scanning, computer graphics, computed
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abstract={The history and famous landmarks of computer graphics hardware are well known. Starting with Ivan Sutherland s Sketchpad system in the early 1960 s, the first generation of computer graphics hardware consisted of calligraphic... more
abstract={The history and famous landmarks of computer graphics hardware are well known. Starting with Ivan Sutherland s Sketchpad system in the early 1960 s, the first generation of computer graphics hardware consisted of calligraphic (vector) displays capable of drawing complex three-dimensional wireframe models at interactive rates. In the early 1970 s expensive color frame buffers with the capability for displaying static color images were introduced. Although more and more intelligence was added to these frame ...
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Abstract How to render very complex datasets, and yet maintain interactive response times, is a hot topic in volume rendering. In this paper we focus on projective visualization of datasets represented via tetrahedral tessellations.... more
Abstract How to render very complex datasets, and yet maintain interactive response times, is a hot topic in volume rendering. In this paper we focus on projective visualization of datasets represented via tetrahedral tessellations. Direct projective visualization is performed by sorting tetrahedra with respect to view direction and then by projecting them onto the screen. Di erent sorting algorithms and\ per tetrahedra" projection techniques are reviewed and evaluated. A new method for tetrahedra projection approximation is ...
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The technological advance of sensors is producing an exponential size growth of the data coming from 3D scanning and digital photography. The production of digital 3D models consisting of tens or even hundreds of millions of triangles is... more
The technological advance of sensors is producing an exponential size growth of the data coming from 3D scanning and digital photography. The production of digital 3D models consisting of tens or even hundreds of millions of triangles is quite easy nowadays; at the same time, using high-resolution digital cameras it is also straightforward to produce a set of pictures of
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Offine rendering techniques have nowadays reached an astonishing level of realism but paying the cost of a long computational time. The new generation of programmable graphic hardware, on the other hand, gives the possibility to implement... more
Offine rendering techniques have nowadays reached an astonishing level of realism but paying the cost of a long computational time. The new generation of programmable graphic hardware, on the other hand, gives the possibility to implement in realtime some of the visual effects previously available only for cinematographic production. In a collaboration between the Visual Computing Lab (ISTI-CNR) with the Institute for Creative Technologies of the University of Southern California, has been developed a realtime demo that replicate a ...
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Wireless solutions are becoming frequent in manufacturing plants: the introduction of wireless in industrial automated processes requires solutions which fulfill industrial environmental and electromagnetic requirements and meet... more
Wireless solutions are becoming frequent in manufacturing plants: the introduction of wireless in industrial automated processes requires solutions which fulfill industrial environmental and electromagnetic requirements and meet reliability and communication performance typically required by control loops. In this paper these issues are discussed and set by a practical case involving WiFi transceivers, requiring an EMC (Electromagnetic Compatibility) industrial certification and