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Shading by Texture Variation

IP.com Disclosure Number: IPCOM000034456D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Todd, SJP Woodwark, JR [+details]

Abstract

This article describes a method that allows the number of different colors required to display a textured surface of an image-synthesized object to be reduced, thus facilitating output by low resolution visual devices. Background Solid texturing [*] is a convenient method to produce a random pattern effect on the surface of complicated shapes. In the simplest embodiment, a three-dimensional 'pseudo-fractal' scalar field is defined over the space occupied by the object, but is evaluated only at its surface. Ranges in value of the field are made to correspond to different colors that a lighting model program is subsequently applied to. This approach produces a large range of different colors from the interaction of texture and lighting which can be a problem for low color-resolution displays or limited-color printing processes.