--- ray/doc/man/man1/rpict.1	2022/10/19 18:23:14	1.27
+++ ray/doc/man/man1/rpict.1	2025/04/22 17:12:25	1.31
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rpict.1,v 1.27 2022/10/19 18:23:14 greg Exp $"
+.\" RCSid "$Id: rpict.1,v 1.31 2025/04/22 17:12:25 greg Exp $"
 .TH RPICT 1 2/26/99 RADIANCE
 .SH NAME
 rpict - generate a RADIANCE picture
@@ -18,6 +18,8 @@ rpict - generate a RADIANCE picture
 ]
 .br
 .B "rpict [ options ] \-defaults"
+.br
+.B "rpict \-features [feat1 ..]"
 .SH DESCRIPTION
 .I Rpict
 generates a picture from the RADIANCE scene given in
@@ -41,6 +43,21 @@ In the second form shown above, the default values
 for the options (modified by those options present)
 are printed with a brief explanation.
 .PP
+In the third form, a list of supported features is sent
+to the standard output, one per line.
+If additional arguments follow, they are checked for presence in
+this list.
+If a feature includes subfeatures, these may be checked as well by
+specifying:
+.nf
+
+	rpict -features FeatName=subfeat1,subfeat2
+
+.fi
+If any named feature or subfeature is missing, an error is
+reported and the program returns an error status.
+If all of the named features are present, a zero status is returned.
+.PP
 Most options are followed by one or more arguments, which must be
 separated from the option and each other by white space.
 The exceptions to this rule are the 
@@ -254,6 +271,25 @@ to use a very small fraction with the
 .I \-pd
 option, to avoid the ghosting effect of too few samples.
 .TP
+.BI -pc " xr yr xg yg xb yb xw yw"
+Use the specified chromaticity pairs for output primaries and white
+point rather than the standard RGB color space.
+.TP
+.BR \-pRGB
+Output standard RGB values (the default).
+.TP
+.BR \-pXYZ
+Output standard CIE XYZ tristimulus values rather than RGB.
+.TP
+.BI -f \ source
+Load definitions from
+.I source
+and assign at global level.
+.TP
+.BI -e \ expr
+Set additional definitions from
+.I expr.
+.TP
 .BI -dj \ frac
 Set the direct jittering to
 .I frac.
@@ -682,6 +718,19 @@ continue rays with a probability equal to the ray weig
 divided by the given
 .I frac.
 .TP
+.BI -cs \ Ns
+Use
+.I Ns
+bands for spectral sampling rather than the default RGB calculation space.
+The maximum setting is controlled by the compiler macro MAXCSAMP, and
+defaults to 24.
+Larger values for Ns will be reduced to MAXCSAMP.
+.TP
+.BI -cw " nmA nmB"
+Set extrema to the given wavelengths for spectral sampling.
+The default is 380 and 780 nanometers.
+The order specified does not matter.
+.TP
 .BI -S \ seqstart
 Instead of generating a single picture based only on the view
 parameters given on the command line, this option causes
@@ -876,6 +925,8 @@ A value of zero turns automatic reporting off.
 Send error messages and progress reports to
 .I efile
 instead of the standard error.
+(Note this option overlaps with "-e expr" above, so file paths
+with '=' or ':' in them are not allowed on this option.)
 .TP
 .BR \-w
 Boolean switch for warning messages.