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• W2181844590 abstract "The topic of this thesis is volume graphics, and in particular techniques which are applicable to volume sculpting. A volume sculpting system is an interactive computer program for shape modelling where the shape is represented volumetrically in a 3D lattice of so–called voxels. It is argued that it is reasonable to classify the tools in a sculpting system according to whether the tools tend to deform the sculpted object or work according to the paradigm of Constructive Solid Geometry (CSG). Existing volume sculpting systems are surveyed, and it is found that almost all systems provide sculpting tools belonging exclusively to either or both categories. It is also found that existing systems have a number of important deficiencies. For instance, none of the systems provide a generic methodology for deformation. Rather they provide specific solutions for concrete deformation tasks, e.g. smoothing or the creation of small protrusions or dents. Moreover, most of the existing systems are based on a volume representation where the value of a voxel is construed as a pseudo–density with no precise meaning. More precisely, we can tell from a voxel whether it is on the inside or the outside of a represented solid, but nothing more. In this thesis it is argued, that it is useful to be able to give a voxel a more precise meaning. This leads to a cleaner volume representation, and if we choose (as the precise meaning of a voxel) the shortest distance from the voxel position to the closest surface point, we reap additional benefits: It becomes trivial to find surface points, and it becomes much easier to find offset surfaces and to compute various geometric properties such as curvature. Generic techniques for constructive (CSG based) and deformative tools have" @default.
• W2181844590 created "2016-06-24" @default.
• W2181844590 creator A5032257710 @default.
• W2181844590 creator A5054284458 @default.
• W2181844590 date "2002-01-01" @default.
• W2181844590 modified "2023-09-25" @default.
• W2181844590 title "MANIPULATION OF VOLUMETRIC SOLIDS WITH APPLICATIONS TO SCULPTING" @default.
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