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Has files: true × Start date: 1988 × End date: 1989 × Author: Schneider, Bengt-Olaf ×

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    PROOF: An Architecture for Rendering In Object Space
    (The Eurographics Association, 1988) Schneider, Bengt-Olaf; Claussen, Ute; A. A. M.Kuijk
    This paper gives a short introduction into the field of computer image generation in hardware. It discusses the two main approaches, namely partitioning in Image space and In object space. Based on the object space partitioning approach we have defined the PROOF architecture. PROOF is a system that aims at high performance and high quality rendering of raster images. high performance means that up to 30 pictures are generated in one second. The pictures are shaded and anti-allased, giving the images a high degree of realism. The architecture comprises tnree stages which are responsible for hidden surface removal, shading, and filtering respectively. The first of these stages a pipeline of object processors. Each of these processors stores and scan converts one obiect Furthermore, It interpolates the depth and the normal vector across the Object. Each object processor IS able to handle objects of a certain primitive type. The specialization of an object processor to a certain primitive type is encapsulated in a Single block called primitive processor. The Outout of the object processor pipeline is the input to a stage for shading. The illumination model employed takes In~o account both diffuse and specular reflections. The paper reviews Gouraud and Phong shading with regard to their suitability for a hardware implementation. The final stage of the PROOF system is formed by a stage for filtering the colours of those objects that contribute to a pixel. This done by constructing a subpixel mask and filtering across an area of 2x2 pixels. At the end. the paper briefly reports on the current state of the project.
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    A Processor for an Object-Oriented Rendering System
    (Blackwell Publishing Ltd and the Eurographics Association, 1988) Schneider, Bengt-Olaf
    An object oriented approach to the real-time rendering of raster images is described. The architecture is based on a set of object processors arranged in a pipeline. These object processors scan convert the objects in the scene and interpolate depth and normal vectors across the objects. Hidden surface elimination is distributed along the pipeline. The structure of the object processors and of the algorithms employed are described in detail.Computing Reviews Classification: C. 1.2, C.3, 1.3.1
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    Towards a Taxonomy for Display Processors
    (The Eurographics Association, 1989) Schneider, Bengt-Olaf; Richard Grimsdale and Wolfgang Strasser
    Image generation for raster displays proceeds in two main steps: geometry processing and pixel processing. The snbsystem performing the pixel processing is called display processor.In the paper a model for the displa.y processor is developed that takes into account both function and timing properties. The model identifies scan conversion, hidden surface removal, shading and anti-aliasing as tile key functions of the display processor. The timing model is expressed in an inequation being fundamental for all display processor architectures.On the basis of that model a taxonomy is presented which classifies display processors according to four main criteria: function, partitioning, a.rchitecture and performance.The taxonomy is applied to five real display processors: Pixel-planes, SLAM, PROOF, the Ray-Casting Machine and the Structured Frame Store System.Investigation of existing display processor architectures on the basis of the devel oped taxonomy revealed a potential new architecture. This architecture partitions the image generation process ill image space and employs a. tree topology.