Non-Photorealistic Computer Graphics Library

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Article How to Render Frames and Influence People

Author(s): Thomas Strothotte, Bernhard Preim, Andreas Raab, Jutta Schumann, David R. Forsey.
Article: Computer Graphics Forum, Vol. 13, No. 3, pp. 455--466, 1994.
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Rendering systems generally treat the production of images as an objective process governed by the laws of physics. However, perception and understanding on the part of viewers are subjective processes influenced by a variety of factors. For example, in the presentation of architectural drawings, the apparent precision with which the drawings are made will affect whether the viewer considers the design as part of a preliminary design or as part of a final polished project, and to some extent the level of confidence the viewer has in the encoded information. In this paper we develop techniques for rendering images in a way that differs from the usual photorealistic or wire-frame output of renderers. In particular, our techniques allow a user to adjust the rendering of a scene to produce images using primitives with variable degrees of precision, from approximations that resemble vague five-minute-sketches to more mature but still hand-drawn images. We provide a theoretical framework for analysing the information flow from the computer to the user via such images. Finally, we describe the design and implementation of a prototypical renderer and show examples of its output.

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