Measuring and Modeling Anisotropic Reflection

by Greg Ward

ABSTRACT

A new device for measuring the spatial reflectance distributions of surfaces is introduced, along with a new mathematical model of anisotropic reflectance. The reflectance model presented is both simple and accurate, permitting efficient reflectance data reduction and reproduction. The validity of the model is substantiated with comparisons to complete measurements of surface reflectance functions gathered with the novel reflectometry device. This new device uses imaging technology to capture the entire hemisphere of reflected directions simultaneously, which greatly accelerates the reflectance data gathering process, making it possible to measure dozens of surfaces in the time that it used to take to do one. Example measurements and simulations are shown, and a table of fitted parameters for several surfaces is presented.


Unfortunately, we do not have an HTML version of this paper to offer. Instead, we have a set of PostScript files that together comprise the original submission, and a set of scanned images from the final, printed proceedings. The PostScript files look better, but are not an exact facsimile of the published paper.

The PostScript files are bundled in a compressed tar archive, paper.tar.Z (4781K). A README file contained in this archive describes its contents.

The scanned pages from the published paper are offered in GIF and compressed TIFF formats. The GIF's are a bit smaller, but some quality may be lost on pages 6 and 7, which were originally in 24-bit color. (If you lack 24-bit capability, then you are better off with the GIF images.) All other pages are grayscale. To pick up the pages one at a time, click on the file names below:

  1. page1.gif (99K) or page1.tif (430K)
  2. page2.gif (102K) or page2.tif (420K)
  3. page3.gif (96K) or page3.tif (407K)
  4. page4.gif (85K) or page4.tif (407K)
  5. page5.gif (67K) or page5.tif (351K)
  6. page6.gif (560K) or page6.tif (2381K)
  7. page7.gif (488K) or page7.tif (2381K)
  8. page8.gif (118K) or page8.tif (453K)