When I ray trace a surface, the colors on the surface appear to have a smaller color depth.  In other words, there are finite boundaries between different shades of colors rather than a smooth gradient.  Could the problem be color-dependent?  Has anyone seen this?  Any ideas how to fix it?

Mark A. Saper, Ph.D.
Associate Professor of Biological Chemistry
University of Michigan

Biophysics, 3040 Chemistry Building
930 N University Ave
Ann Arbor MI  48109-1055 U.S.A.