Accession Number:

ADA220847

Title:

A Toolbox for Shading

Descriptive Note:

Final rept.

Corporate Author:

INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA

Personal Author(s):

Report Date:

1990-02-01

Pagination or Media Count:

198.0

Abstract:

IDA Paper P-2354, A Toolbox for Shading, documents the research performed under an internal research and development program, the Central Research Program CRP 9000-502. The research probed the shortcomings of existing shading algorithms. The investigation yielded seven new techniques to render more realistic images at a modest increase in computational costs. Specifically, quadratic interpolation of intensities and adaptive subdivision of surfaces are proposed to generate smoother intensity surfaces and thereby reduce Mach banding. Techniques are introduced to locate highlights and adaptively subdivide surfaces to capture the intensity peaks associated with specular reflection. Ambient cut-off and adaptive subdivision are applied to accurately render diffuse boundaries. Tradeoffs are examined so that a subset of this toolbox of shading techniques can be chosen to most effectively satisfy the processing and realism requirements of a given image-generating application and environment.

Subject Categories:

  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE