Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Illuminance texture due to surface mesostructure

Not Accessible

Your library or personal account may give you access

Abstract

We study the illuminance texture due to three-dimensional surface mesostructure. In the conventional rendering algorithms various methods of approximate photometry are used whose domains of validity have been ill defined. We introduce the necessary photometric concepts and do a comparative study of rendering algorithms. In the computer graphics/vision literature the physically distinct causes of illuminance variation, namely, the obliqueness of surface elements and the effects of vignetting of extended sources, are thoroughly confused. This leads to serious errors when expressions are used in contexts outside their original realm. The treatment of the texture that is due to the illumination of surface mesostructure is an example. Erroneous results are obtained when simple expressions for the illuminance of convex bodies are interpreted in terms of equivalent sources and when these again are used in calculations involving different geometrical structures. We classify current methods in terms of the approximations (often implicitly) made and compare results for a large class of applications: that of surface mesostructure on convex objects. Large differences among the various approximative methods are found. We discuss simple methods that might be used to produce more realistic results at reasonable computational cost.

© 1996 Optical Society of America

Full Article  |  PDF Article
More Like This
Illumination direction from texture shading

Jan J. Koenderink, Andrea J. van Doorn, Astrid M. L. Kappers, Susan F. te Pas, and Sylvia C. Pont
J. Opt. Soc. Am. A 20(6) 987-995 (2003)

Illuminance flow over anisotropic surfaces

Stefan Karlsson, Sylvia Pont, and Jan Koenderink
J. Opt. Soc. Am. A 25(2) 282-291 (2008)

Irradiation direction from texture

Jan J. Koenderink and Sylvia C. Pont
J. Opt. Soc. Am. A 20(10) 1875-1882 (2003)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (11)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (25)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved