--- ray/doc/man/man1/rcomb.1	2024/10/01 01:16:26	1.11
+++ ray/doc/man/man1/rcomb.1	2025/06/19 22:36:53	1.14
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcomb.1,v 1.11 2024/10/01 01:16:26 greg Exp $"
+.\" RCSid "$Id: rcomb.1,v 1.14 2025/06/19 22:36:53 greg Exp $"
 .TH RCOMB 12/5/2023 RADIANCE
 .SH NAME
 rcomb - combine and convert matrices a row at a time
@@ -25,7 +25,7 @@ rcomb - combine and convert matrices a row at a time
 ]
 .B "m1 .."
 [
-.B "\-m mcat"
+.B "\-m[t] mcat"
 ]
 .SH DESCRIPTION
 .I Rcomb
@@ -60,6 +60,9 @@ A single concatenation matrix may be applied after ele
 using the
 .I \-m
 option.
+If the option is given as
+.I \-mt
+then the concatenation matrix will be transposed before it is applied.
 Matrix concatenation will happen before or after any trailing
 operations, depending on relative command line placement.
 .PP
@@ -339,6 +342,14 @@ is not supported in
 .I rcomb,
 and should instead be handled by
 .I pfilt(1).
+.PP
+Similar to
+.I rmtxop,
+all calculations are peformed internally using 32-bit floating-point,
+so there is little benefit in either reading or writing 64-bit double
+data.
+This may be overridden at compile time using the macro
+"-DDTrmx_native=DTdouble".
 .SH BUGS
 The
 .I rcomb
@@ -349,6 +360,6 @@ circumstances where it would make sense to.
 Greg Ward
 .SH "SEE ALSO"
 dctimestep(1), icalc(1), getinfo(1), pcomb(1), pfilt(1),
-ra_rgbe(1), ra_xyze(1), rcalc(1),
+pvsum(1), ra_rgbe(1), ra_xyze(1), rcalc(1),
 rcollate(1), rcontrib(1), rcrop(1), rfluxmtx(1), 
 rmtxop(1), rtpict(1), rtrace(1), vwrays(1)