104 research outputs found

    Multiprocessor Iso-surface Volume Rendering

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    The rendering of iso-surfaces in a scalar 3D dataset can be performed with a new algorithm, called iso surface volume rendering. This algorithm does not introduce sampling artifacts or artifacts due to triangularization. The risk to skip very small details by insufficient re-sampling is also eliminated. Another advantage is its speed compared to conventional volume rendering. So far we achieved speeds in the order of ten frames per second on advanced CPU's. The multiprocessor implementation of this new algorithm uses a division of the voxel data into multiple cubes. These cubes are the basis for distributing the workload onto several processors. A scheduler process is running to perform the distribution of the workload. During the distribution of the workload the scheduler also eliminates the need to render invisible parts of the dataset. This reduces the part of the dataset which must be processed to one third of the original dataset for typical applications. Another major advantage of the scheduling algorithm is that the communication overhead is reduced by a factor of ten to twenty, which allows for the efficient use of many processors

    Roasting pyrite for magnetism with minimum sulphur volatilization

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    In Wisconsin and other zinc mining districts the blende is frequently found associated with pyrite and marcasite. In the Wisconsin district, especially, the marcasite content of the mine-run ore is high being frequently equal to and in many cases greater than the sphalerite content. At time the marcasite and sphalerite together constitute as much as 25 or 30% of the min-run ore. The characteristic milling treatment of this ore is; first, hand-picking, and then over grizzlies, tromells, rougher and cleaner jigs. Owing to the fact that marcasite and sphalerite differ but slightly in specific gravity the jig concentrate obtained is a mixture of the two and varies in composition from all blende to all marcasite. This product, owing to the high iron content, is not suited for the zinc smelter, and magnetic or electro-static schemes of separation must be resorted to --Problem of the Work, page 1

    In the Senate of the United States. Letter from the Secretary of the Interior, relative to granting pensions and medals to Indians of the Standing Rock Agency.

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    Indians of the Standing Rock Agency. 22 Apr. SED 84, 52-1, v6, 12p. [2901] Granting pensions and medals to families of Indian policemen; service in the engagement at Sitting Bull\u27s camp in 1890; Sioux Indians of North Dakota

    A Korean Family Comes to the US

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    Trinity Tripod, 1922-03-07

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    A survey of techniques and technologies for web-based real-time interactive rendering

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    When exploring a virtual environment, realism depends mainly on two factors: realistic images and real-time feedback (motions, behaviour etc.). In this context, photo realism and physical validity of computer generated images required by emerging applications, such as advanced e-commerce, still impose major challenges in the area of rendering research whereas the complexity of lighting phenomena further requires powerful and predictable computing if time constraints must be attained. In this technical report we address the state-of-the-art on rendering, trying to put the focus on approaches, techniques and technologies that might enable real-time interactive web-based clientserver rendering systems. The focus is on the end-systems and not the networking technologies used to interconnect client(s) and server(s).Siemens; Bertelsmann mediaSystems GmbH; Eptron Multimedia; Instituto Politécnico do Porto - ISEP-IPP; Institute Laboratory for Mixed Realities at the Academy of Media Arts Cologne, LMR; Mälardalen Real-Time Research Centre (MRTC) at Mälardalen University in Västerås; Q-Systems

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    The Bur (Vol. XXI, No. 2)

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