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Item 3D Scene Comparison using Topological Graphs(The Eurographics Association, 2007) Paraboschi, L.; Biasotti, S.; Falcidieno, B.; Raffaele De Amicis and Giuseppe ContiNew technologies for shape acquisition and rendering of digital shapes have simplified the process of creating virtual scenes; nonetheless, shape annotation, recognition and manipulation of both the complete virtual scenes and even of subparts of them are still open problems. In this paper we deal with the problem of comparing two (or more) object sets, where each model is represented by an attributed graph. We will define a new distance to estimate the possible similarities among the sets of graphs and will validate our work using the shape graph [BGSF06].Item Bringing the Semantics into Digital Shapes: the AIM@SHAPE Approach(The Eurographics Association, 2007) Falcidieno, Bianca; Raffaele De Amicis and Giuseppe ContiThis presentation describes the main objectives and achievements of the European Network of Excellence AIM@SHAPE. This NoE is aimed to advance research in the direction of semantic-based shape representations and tools able to acquire, build, transmit and process shapes with their associated knowledge. Acting on a multi-disciplinary research field, AIM@SHAPE deeply integrates geometry processing, computer graphics and vision with knowledge technologies. The core of the integration resides in the homogenisation of the approach to modelling shapes and their associated semantics using knowledge formalisation mechanisms: metadata and ontology. A main objective is also to develop an innovative e-science platform for modelling, processing and sharing digital shapes, called the Digital Shape Workbench (DSW). Through the definition of general and specific shape ontologies, the DSW is a framework able to store shapes, tools, and publications along with the knowledge related to them.Item An Immersive Granular Material Visualization System with Haptic Feedback(The Eurographics Association, 2007) Dorjgotov, Enkhtuvshin; Benes, Bedrich; Madhavan, Krishna; Ik Soo Lim and David DuceRecent advances in distributed virtual reality systems and haptic technologies provide new opportunities to augment human sense of touch into highly complex and immersive visual simulations. Haptic feedback further enhances human immersion into virtual environments. We present techniques for portable and distributed rendering of real-time active and passive stereo views of virtual granular material that allow real-time haptic interaction and visualization. The main goal of the research was to develop highly portable and immersive virtual reality system that provides intuitive haptic interactions between a user and the granular material in several VR configurations. We developed real-time haptic enabled virtual sand rendering system for high-end VR systems, a FLEX (CAVETM-like display from Fakespace Systems), a high resolution tiled-wall display, comparatively low cost portable VR system that consists of two projectors with two horizontally and vertically polarizing filters, and the Disney projection screen. Our system has a distributed rendering architecture where a server computer is dedicated to haptic interaction force rendering and client computers are dedicated to a visual rendering of granular surface. Interconnection between the haptic and visual rendering programs is realized through a stream based TCP/IP communication. We report the architecture and implementation details of this highly portable and haptic force feedback enabled virtual reality system for interactive granular surface manipulation in this paper.