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    Interactive Rendering of Volumetric Data Sets
    (The Eurographics Association, 1994) Juskiw, "Scott; Durdle, Nelson G.; W. Strasser
    The bela architecture for interactive rendering of regularly structured volumetric data sets is presented. The proposed architecture is scalable and uses custom processors to achieve high-speed shading, projection. and composition of voxel primitives. A general purpose image composition network supports the accumulation of both volumetric and geometric elements into the final rendered scene. Data access contentions between processors are eliminated via the use of an enhanced dual object space and image space partitioning scheme that does not require replication or redistribution of rendered data. The bela architecture is intended for rendering large data sets and meets the performance requirements of a full frame interactive image generation system.
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    A 33MHz 16. Bit Gradient Calculator for Real-Time Volume Imaging
    (The Eurographics Association, 1994) Margala, Martin; Durdle, Nelson G.; Raso, V. James; Hill, Doug L.; W. Strasser
    This paper describes a gradient calculator which forms an important part of a shading processor being developed for a high resolution high performance real-time general purpose volume imaging system. The proposed architecture overcomes cunent image resolution and frame-rate limitations through the use of custom high-speed processors. The gradient calculator evaluates three arithmetic operations: a square and add operation, square-root, and three division operations. Input output delay time is 30 os with an accuracy of ±O.78%. The algorithms and implementation in silicon are described in detail.