--- ray/doc/man/man1/ranimate.1	2003/12/09 15:59:06	1.2
+++ ray/doc/man/man1/ranimate.1	2005/01/18 20:19:56	1.4
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: ranimate.1,v 1.2 2003/12/09 15:59:06 greg Exp $"
+.\" RCSid "$Id: ranimate.1,v 1.4 2005/01/18 20:19:56 greg Exp $"
 .TH RANIMATE 1 6/24/98 RADIANCE
 .SH NAME
 ranimate - compute a RADIANCE animation
@@ -352,14 +352,35 @@ If this number is less than 2, then bluring is perform
 only, resulting in greater noise than the combination of
 .I rpict
 and
-.I pinterp used otherwise.
+.I pinterp
+used otherwise.
 (The default value for number of samples is 5.)\0
-The
-.I pmblur(1)
-command is used to generate the given number of additional views for
+The default fraction is 0, meaning no motion blurring.
+This option does not currently work with the
+.I ANIMATE
+variable, since pinterp only works for static environments.
+.TP
+.BR DBLUR
+This variable specifies the aperture diameter for depth-of-field blurring,
+in world units.
+A number of samples may be given as a second argument, which controls the
+number of additional frames computed and averaged together by
+.I pinterp.
+If this number is less than 2, then blurring is performed by
+.I rpict
+only, resulting in greater noise than the combination of
+.I rpict
+and
 .I pinterp
-to average together.
-The default value is 0, meaning no motion blurring.
+used otherwise.
+(The default value for number of samples is 5.)\0
+To simulate a particular camera's aperture, divide the focal length of
+the lens by the f-number, then convert to the corresponding
+world coordinate units.
+For example, if you wish to simulate a 50mm lens at f/2.0 in
+a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm,
+which corresponds to an effective aperture of 0.025 meters.
+The default aperture is 0, meaning no depth-of-field blurring.
 This option does not currently work with the
 .I ANIMATE
 variable, since pinterp only works for static environments.