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"abstract": "In Computer Graphics a boundary representation of objects\nis often used to generate realistic synthetic images. For\ncertain objects it is more suitable to use a volume\nrepresentation. In this paper we investigate the\nvisualization of knitting patterns where the details\nof the yarn were modeled by voxel data. The visualization\nand the modeling of textiles has already been investigated\nin depth in the computer graphics literature. However most\nof the publications consider woven fabrics. In the case of\nknitwear the topological specification of the knitting\npattern allows a subdivision into basic elements. The thread\ncourse and the microstructure of the yarn are then\napproximated by voxel data. The periodic structure of\nknitting patterns allows for a compact representation and\nan efficient rendering. The generated images demonstrate the\n\t\tpossible realistic simulations. ",
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"abstract": "Trying to combine fractal geometry and solid modeling seems to be a contradiction in itself, In this paper a\nnew type of 3D objects is presented that accomplishes this combination in a specific way. Objects with a\nfractal macro structure and a 3D solid micro structure can be specified and rendered efficiently by using context\nfree, attribute, geometric grammars. This new object type can be incorporated into the CSG-modeling\ntechnique (Constructive Solid Geometry) in two ways: a) using CSG for the specification of the micro\nstructure of the new object type, b) using these fractal like objects as a new type of primitive in the CSG\nmodel. Ray tracing is used for generating high quality images of these geometrically complex objects.",
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