--- ray/doc/man/man1/rcontrib.1	2022/10/19 21:25:20	1.21
+++ ray/doc/man/man1/rcontrib.1	2025/04/23 15:09:03	1.26
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcontrib.1,v 1.21 2022/10/19 21:25:20 greg Exp $"
+.\" RCSid "$Id: rcontrib.1,v 1.26 2025/04/23 15:09:03 greg Exp $"
 .TH RCONTRIB 1 5/25/05 RADIANCE
 .SH NAME
 rcontrib - compute contribution coefficients in a RADIANCE scene
@@ -208,7 +208,11 @@ and
 .I \-o
 options to the left of each
 .I \-m
-setting are the ones used for that modifier.
+name are the ones used for that modifier.
+Any
+.I \-cs
+option changing the number of spectral color
+samples must appear before the first modifier.
 The ordering of other options is unimportant, except for
 .I \-x
 and
@@ -250,12 +254,20 @@ The rules and predefined functions available for these
 described in the
 .I rcalc(1)
 man page.
-Like
-.I rcalc,
+Like the other rendering tools,
 .I rcontrib
-will search the RADIANCE library directories for each file given in a
+will search the 
+.I RAYPATH
+library directories for each file given in a
 .I \-f
 option.
+However, a special evaluation context is set for the
+.I \-f
+and
+.I \-e
+definitions, so attach a back-quote ('`') to variable and function names
+you wish these to apply at the global evaluation level and used by all
+materials and modifiers during rendering.
 .PP
 If no
 .I \-o
@@ -362,7 +374,7 @@ is detected.
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"
-cnt(1), genklemsamp(1), getinfo(1), mkpmap(1), pcomb(1), pfilt(1), 
-ra_rgbe(1), rcalc(1), rfluxmtx(1), rmtxop(1), rpict(1), rsensor(1), 
-rtrace(1), total(1), vwrays(1), ximage(1)
+cnt(1), dctimestep(1), genklemsamp(1), getinfo(1), mkpmap(1), pcomb(1), pfilt(1), 
+pvsum(1), ra_rgbe(1), rcalc(1), rcomb(1), rfluxmtx(1), rmtxop(1), rpict(1),
+rsensor(1), rtrace(1), total(1), vwrays(1), ximage(1)