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    IMPROVE: the experience from a FP6 EU project
    (The Eurographics Association, 2008) Witzel, Martin; Conti, Giuseppe; Amicis, Raffaele De; Vittorio Scarano and Rosario De Chiara and Ugo Erra
    This paper aims at introducing the results of the EU FP6 project IMPROVE to the Italian community showing the results and specifically those achieved by Graphitech within its context. The project aimed at delivering advanced visualization and interaction technologies in the field of design review. In terms of hardware the project has delivered innovative technologies for lightweight near-to-the-eye displays and for tiled stereoscopic large size displays. In terms of software technologies the project has delivered novel interaction paradigms which are suitable for such hardware. The achievements of IMPROVE have been integrated into a collaborative mixed reality product development environment, showcased and evaluated in two application scenarios: collaborative product design in the car industry and architectural design. Specifically a final user test for the automotive scenario was undertaken at Elasis, Naples which was one of IMPROVE partners.
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    Freehand 3D Curve Recognition and Oversketching
    (The Eurographics Association, 2005) Han, Li; Amicis, Raffaele De; Conti, Giuseppe; Louise M. Lever and Mary McDerby
    In the CAD/CAS field, the increasing domination of spline-based graphic objects has driven a great attention to methods focusing on the management of free-form curves. Based on the quick brainstorm illustration and stepwise refinement characteristics in conceptual designing stage, we present a method, which automatically reconstructs the designer s free-form 3D curve through recognizing his design intention . This algorithm automatically extracts the relevant control points through corner detection and dynamic-threshold sampling mechanism; as a result the Bspline curve is approximately produced. Furthermore, considering the ambiguity of designer s intention during the conceptual designing, this redraw operation feature is implemented through the so-called over-sketching . For this we introduce constrained length and tangent angle features, which supports fully free form 3D curve sketching, and it is capable of effectively smoothen transition interval. The method has been tested with various types of sketches, which are rendered in 3D scene environment. We further discuss the modification and its application to surfaces.
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    Spline-based Shape Modeling by 3D Sketching
    (The Eurographics Association, 2007) Han, Li; Amicis, Raffaele De; Conti, Giuseppe; Raffaele De Amicis and Giuseppe Conti
    The increasing domination of spline-based graphic objects in CAD/CAS has driven a great attention to methods focusing on natural and intelligent free-form shape manipulation. We present a novel sketch-based system for the interactive modeling of a variety of free-form 3D objects using just simple spline sketches. Our technique addresses the issue of the traditional illustrations for depicting 3D subjects, ranging from geometric modeling to progressive refinement. The robust surface interpreters we proposed support NURBS surface construction respecting the designers' different drawing styles, and a so called spline-driven deformation technique provides designer predictable surface edition. In our system the spline strokes are freely sketched in 3D space and they are controlled by 3D dragger, which will produce a sequence of dynamic deformations to facilitate the user to achieve the desired models. The method has been tested with various types of sketches, which are rendered in a 3D environment.