--- ray/doc/ray.1	2006/05/10 19:50:30	1.9
+++ ray/doc/ray.1	2007/08/23 04:13:50	1.13
@@ -1,8 +1,8 @@
 .\" RCSid "$Id"
 .\" Print using the -ms macro package
-.DA 1/20/99
+.DA 10/17/2006
 .LP
-.tl """Copyright \(co 2003 Regents, University of California
+.tl """Copyright \(co 2006 Regents, University of California
 .sp 2
 .TL
 The
@@ -1109,10 +1109,6 @@ which serves as a form of opacity control when used wi
 Vname is the coefficient defined in funcfile that determines the influence
 of foreground.
 The background coefficient is always (1-vname).
-Since the references are not resolved until runtime, the last
-definitions of the modifier id's will be used.
-This can result in modifier loops, which are detected by the
-renderer.
 .LP
 .UL Mixdata
 .PP
@@ -1239,8 +1235,7 @@ If no file is needed by a given primitive because all 
 variables are global, a period (`.') can be given in
 place of the file name.
 It is also possible to give an expression instead of a straight
-variable name in a scene file, although such expressions should
-be kept simple if possible.
+variable name in a scene file.
 Also, functions (requiring parameters)
 must be given as names and not as expressions.
 .PP
@@ -1495,6 +1490,11 @@ the Ecole Polytechnique Federale de Lausanne (EPFL Uni
 in Lausanne, Switzerland.
 .NH 1
 References
+.LP
+Cater, K., A. Chalmers, G. Ward,
+``Detail to Attention: Exploiting Visual Tasks for Selective Rendering,''
+.I "Eurograhics Symposium on Rendering",
+June 2003.
 .LP
 Ward, G., Elena Eydelberg-Vileshin,
 ``Picture Perfect RGB Rendering Using Spectral Prefiltering and