This paper presents an object-oriented approach for creating multi-region non-manifold models with NURBS. The main motivation is that the geometry and shape of realistic engineering objects are intrinsically complex, ...
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This paper presents an object-oriented approach for creating multi-region non-manifold models with NURBS. The main motivation is that the geometry and shape of realistic engineering objects are intrinsically complex, usually composed by several materials and regions. Therefore, automatic and/or adaptive meshing algorithms have become revealed themselves quite useful to increase the reliability of the procedures of a FEM numerical analysis. The present approach is concerned with two aspects of 3D FEM simulation: geometric modeling, with automatic multi-region detection, and support to automatic finite element mesh generation. The final objective is to use geometric models directly in numerical applications.
Professor John Belcher developed a series of short videos with animation and text of selected experiments to properly demonstrate the phenomena of electromagnetism. Such 3D animations are visually compelling, instilli...
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Professor John Belcher developed a series of short videos with animation and text of selected experiments to properly demonstrate the phenomena of electromagnetism. Such 3D animations are visually compelling, instilling in the student both a sense of wonder about the phenomena and a mental model of why and how it works. The products of these approach includes video clips of demonstrations, 3D animations of these demonstration which display time changing field-lines as a guide to understanding their dynamical effects and Java applets which allow the student to actively construct and animate 2D field lines for varying configurations of sources. These technologies are also implemented to develop animations for Faraday's insights, using video clips.
A novel approach to three-dimensional segmentation, parametric surface representation, and interactive surface modification is reported. The combination of shape-based and appearance-based volumetric segmentation, par...
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A novel approach to three-dimensional segmentation, parametric surface representation, and interactive surface modification is reported. The combination of shape-based and appearance-based volumetric segmentation, parametric representation of 3D surfaces, and their interactive modification and editing forms a very powerful paradigm for a variety of volumetric segmentation tasks. Performance assessment of the method for automated segmentation of diaphragm surfaces in volumetric 3D CT images is ongoing.
Virtual colonoscopy or ‘colonography’ is a patient-friendly, modern screening technique for polyps. Automatic detection of polyps can serve to assist the radiologist. This paper presents a method based on clustering...
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Most systems that support visual interaction with 3D models use shape representations based on triangle meshes. Thesize of these representations imposes limits on applications for which complex 3D models must be acces...
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Most systems that support visual interaction with 3D models use shape representations based on triangle meshes. The
size of these representations imposes limits on applications for which complex 3D models must be accessed remotely. Techniques for
simplifying and compressing 3D models reduce the transmission time. Multiresolution formats provide quick access to a crude model
and then refine it progressively. Unfortunately, compared to the best nonprogressive compression methods, previously proposed
progressive refinement techniques impose a significant overhead when the full resolution model must be downloaded. The CPM
(Compressed Progressive Meshes) approach proposed here eliminates this overhead. It uses a new technique, which refines the
topology of the mesh in batches, which each increase the number of vertices by up to 50 percent. Less than an amortized total of 4 bits
per triangle encode where and how the topological refinements should be applied. We estimate the position of new vertices from the
positions of their topological neighbors in the less refined mesh using a new estimator that leads to representations of vertex
coordinates that are 50 percent more compact than previously reported progressive geometry compression techniques.
The creation of virtual humans capable of behaving and interacting realistically with each other requires the development of autonomous believable social agents. Standard goal-oriented approaches are not well suited t...
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Ideal reconstruction filters, for function or arbitrary derivative reconstruction, have to be bounded in order to be practicable since they are infinite in their spatial extent. This can be accomplished by multiplying...
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We present a scheme for embedding secret or public readable watermarks into 3D models consisting of polygonal or NURBS surfaces. The scheme realizes affine invariant watermarks by displacing vertices (control points) ...
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In this paper we present a new framework in Augmented Reality context for rapid evaluation of prototypes before manufacture. The design of such prototypes is a time consuming process, leading t o the need of previous ...
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