--- ray/doc/man/man1/rvu.1	2013/10/18 17:04:13	1.6
+++ ray/doc/man/man1/rvu.1	2018/03/30 23:14:07	1.13
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rvu.1,v 1.6 2013/10/18 17:04:13 greg Exp $"
+.\" RCSid "$Id: rvu.1,v 1.13 2018/03/30 23:14:07 greg Exp $"
 .TH RVU 1 1/1/04 RADIANCE
 .SH NAME
 rvu - generate RADIANCE images interactively
@@ -42,7 +42,7 @@ A command argument beginning with an at sign ('@') is 
 replaced by the contents of the given file.
 The options are the same as for rpict(1), with a few notable exceptions.
 The
-.I "\-r, \-z, \-S, \-P, \-PP"
+.I "\-pd, \-r, \-z, \-S, \-P, \-PP"
 and
 .I \-t
 options are not supported, and
@@ -207,7 +207,9 @@ was started by
 .I rad,
 then the
 .I rfile
-parameter will initially default to the rad input file used.
+parameter will initially default to the
+.I rad
+input file used.
 .TP
 .BI move " [ mag [ x y z ] ]"
 Move camera
@@ -230,13 +232,17 @@ Care must be taken to avoid moving behind or inside ot
 Restart the image, using the specified number of rendering processes.
 Usually used after the "set" command.
 .TP
-.BI origin " [ xo yo zo [ xd yd zd ] ]"
-Change view origin to the indicated world position
+.BI origin " [ d | xo yo zo [ xd yd zd ] ]"
+Move the view forward or backwards the distance specified by a single
+.I d
+argument along the view direction vector.
+If 3 or more arguments are given, move the
+view origin to the indicated world position
 .I "xo yo zo"
 looking in the direction
 .I "xd yd zd."
-If the direction is missing, the current view direction is used.
-If the origin is missing, the cursor is used to select the
+If the direction is unspecified, the current view direction is used.
+Without arguments, the cursor is used to select the
 view origin, and the direction will be determined by the
 (reoriented) surface normal.
 The view type and size will not be altered, but the up vector
@@ -246,7 +252,8 @@ may be changed if the new direction coincides.
 Similar to the "move" command, but pivots the view about a selected point.
 The
 .I angle
-is measured in degrees around the view up vector using the right hand rule.
+is measured in degrees around the view up vector using the right hand rule,
+so a positive value pivots the viewer to the right of the selected point.
 The optional
 .I elev
 is the elevation in degrees from the pivot point; positive raises the view point
@@ -265,7 +272,9 @@ color table selection.
 .BI rotate " angle [ elev [ mag ] ]"
 Rotate the camera horizontally by
 .I angle
-degrees.
+degrees using the right-hand rule.
+A positive value rotates the view towards the left, and a negative value
+looks to the right.
 If an elevation is specified, the camera looks upward
 .I elev
 degrees.
@@ -356,8 +365,10 @@ Stop the program.
 The screen will be redrawn when the program resumes.
 .SH ENVIRONMENT
 RAYPATH		the directories to check for auxiliary files.
+.br
 DISPLAY_GAMMA		the value to use for monitor gamma correction.
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"
-getinfo(1), lookamb(1), oconv(1), pfilt(1), rad(1), rpict(1), rtrace(1)
+getinfo(1), lookamb(1), mkpmap(1),
+oconv(1), pfilt(1), rad(1), rpict(1), rtpict(1), rtrace(1)