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- W2534430728 abstract "This dissertation presents a set of algorithms for modeling and rendering isosurfaces in multiresolution volume visualization. The primary contributions are: (1) the introduction of Implicit Connectivity Mesh (ICM) and its applications, and (2) texturing volumetric objects and accelerated rendering algorithms for voxel-based terrain. The ICM representation is a new type of implicit surfaces. In this representation, a mesh is composed of vertices only. The space is partitioned into cubic cells, where each cell may contain one or more vertices. Each vertex is associated with a connectivity encoding vector, which implicitly defines the connection of this vertex with its neighbors. The connectivity information can be the classification values of cell corner points or the edges/surfaces intersections of the cell. The explicit polygon mesh can be quickly reconstructed using the connectivity information stored in each vertex. Two topology-preserving vertex clustering algorithms, hierarchical clustering and selective clustering, are used for creating a multiresolution ICM. Especially, the selective clustering handles up to four intersection points on a cell edge. Algorithms for converting isosurfaces of volume datasets and polygon meshes into the ICM representation are also presented. The ICM representation provides a new mechanism for isosurface-based simplification and level-of-detail rendering. In simplification, we apply a novel concept of preserving disconnected surface components during simplification. The isosurface components in cells are represented by ICM vertices and are clustered using the ICM clustering algorithms. After building a multiresolution ICM representation, topology-preserved isosurfaces can be extracted under various error thresholds. In level-of-detail rendering, we propose a dynamic, topology-preserving vertex refinement/collapse framework for rendering large isosurfaces. We use a timestamp field to unify vertex tree modification and view-dependent vertex refinement events. We further develop an incremental surface extraction algorithm from the vertex hierarchy. The ICM representation is also effective for solid modeling using CSG operations. In CSG operations for ICM objects, we present a novel multiresolution CSG algorithm to handle the adaptive grid. It uses simple binary operations for the connectivity information. A combination of error minimization and recursive subdivision scheme is applied for the representative vertices. (Abstract shortened by UMI.)" @default.
- W2534430728 created "2016-10-28" @default.
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- W2534430728 date "2004-01-01" @default.
- W2534430728 modified "2023-09-25" @default.
- W2534430728 title "Multiresolution isosurface modeling and rendering" @default.
- W2534430728 hasPublicationYear "2004" @default.
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