--- ray/doc/man/man1/rxfluxmtx.1	2025/10/23 23:34:59	1.1
+++ ray/doc/man/man1/rxfluxmtx.1	2025/10/24 16:52:14	1.2
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rxfluxmtx.1,v 1.1 2025/10/23 23:34:59 greg Exp $"
+.\" RCSid "$Id: rxfluxmtx.1,v 1.2 2025/10/24 16:52:14 greg Exp $"
 .TH RXFLUXMTX 1 10/23/2025 RADIANCE
 .SH NAME
 rxfluxmtx - compute flux transfer matrix(es) for RADIANCE scene
@@ -140,18 +140,27 @@ Orient the "up" direction for the hemisphere using the
 vector.
 .TP
 .BI o =output_spec
-Send the matrix data for this receiver to the indicated file or command.
-Single or double quotes may be used to contain strings with spaces.
+Send the matrix data for this receiver to the indicated file specification.
+Single or double quotes may be used to contain strings with spaces, and
+the usual "%s" and "%d" formats incorporate the modifier name and/or
+bin number, as with
+.I rcontrib.
 Command (piped) output is not supported.
-The file format will be determined by the command-line
+.PP
+If no output_spec directive is given, it must be specified by a
+.I \-o
+setting on the command-line, since output to stdout is not supported.
+The input and output file formats are controlled by the
 .I \-fio
-option, which may use a single letter for identical input and output formats.
-The input file specification matters only in pass-through mode, for which
+option, which may use a single letter for identical i/o formats.
+The input format matters only in pass-through mode, for which
 ASCII input is supported.
 ASCII output is unsupported, since it interferes with
 efficient recovery in the
 .I \-r
 mode.
+The default setting is
+.I \-faf.
 .PP
 In normal execution, only a single sender surface is sampled, but it may be
 comprised of any number of subsurfaces, as in a triangle mesh or similar.
@@ -190,9 +199,9 @@ on a light pipe:
 .IP "" .2i
 rxfluxmtx int_aperture.rad ext_aperture.rad lpipe.rad > lpipe.mtx
 .PP
-To generate a set of DC view component pictures with 9 samples/pixel:
+To generate a set of DC view component pictures with 9 jittered samples/pixel:
 .IP "" .2i
-rxfluxmtx -vf v1.vf -x 512 -y 512 -c 9 -fc reinhart_M4.rad -i scene1.oct
+rxfluxmtx -vf v1.vf -x 512 -y 512 -c 9 -pj .8 -fc reinhart_M4.rad -i scene1.oct
 .PP
 To compute a workplane irradiance matrix for each window in a space:
 .IP "" .2i