--- ray/doc/man/man1/gensurf.1	2025/01/21 01:56:27	1.9
+++ ray/doc/man/man1/gensurf.1	2025/06/27 23:46:06	1.10
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: gensurf.1,v 1.9 2025/01/21 01:56:27 greg Exp $"
+.\" RCSid "$Id: gensurf.1,v 1.10 2025/06/27 23:46:06 greg Exp $"
 .TH GENSURF 1 11/15/93 RADIANCE
 .SH NAME
 gensurf - generate a RADIANCE or Wavefront description of a curved surface
@@ -22,19 +22,19 @@ gensurf - generate a RADIANCE or Wavefront description
 ][
 .B "\-f file"
 ][
-.B \-s
-][
 .B \-i
 ][
+.B \-s
+][
 .B \-o
 ]
 .br
 .B "gensurf mat name dfile dfile dfile m n"
 [
-.B \-s
-][
 .B \-i
 ][
+.B \-s
+][
 .B \-o
 ]
 .SH DESCRIPTION
@@ -70,12 +70,12 @@ The variable and function definitions in each
 .I \-f source
 file are read and compiled from the RADIANCE library where it is found.
 The
+.I \-i
+option reverses surface normal directions relative to the (s,t) parameters, applying
+a left-hand rule, instead.
+The
 .I \-s
 option adds smoothing (surface normal interpolation) to the surface.
-The
-.I \-i
-option reverses surface normal directions from the standard
-clockwise-from-front orientation.
 The
 .I \-o
 option produces a Wavefront .OBJ file rather than a RADIANCE