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Comparing ray/doc/man/man1/pdfblur.1 (file contents):
Revision 1.1 by greg, Tue Mar 11 19:20:21 2003 UTC vs.
Revision 1.5 by greg, Tue Jan 18 20:19:56 2005 UTC

# Line 1 | Line 1
1 < .\" RCSid "$Id"
1 > .\" RCSid "$Id$"
2   .TH PDFBLUR 1 1/24/96 RADIANCE
3   .SH NAME
4   pdfblur - generate views for depth-of-field blurring
5   .SH SYNOPSIS
6   .B pdfblur
7   .B aperture
8 – .B distance
8   .B nsamp
9   .B viewfile
10   .SH DESCRIPTION
# Line 14 | Line 13 | takes the given
13   .I viewfile
14   and computes
15   .I nsamp
16 < views based on a focus distance of
18 < .I distance
19 < and an aperture diameter of
16 > views based on an aperture diameter of
17   .I aperture
18 < (both in world coordinate units).
18 > (in world coordinate units) and a focal distance equal to the length of the
19 > .I \-vd
20 > view direction vector.
21   When rendered and averaged together, these views will result in
22   a picture with the specified depth of field.
23   Either
# Line 87 | Line 86 | We have found a
86   .I nsamp
87   setting somewhere between 5 and 10 to be adequate for most images.
88   Relatively larger values are appropriate for larger aperatures.
89 + .PP
90 + The
91 + .I \-pd
92 + option of
93 + .I rpict
94 + may be used instead or in combination with or instead of
95 + .I pdfblur
96 + to blur depth-of-field.
97 + If used in combination,
98 + it is best to set the
99 + .I \-pd
100 + option to the overall
101 + .I aperture
102 + divided by
103 + .I nsamp
104 + to minimize ghosting in the output.
105 + .PP
106 + To simulate a particular camera's aperture, divide the focal length of
107 + the lens by the f-number, then convert to the corresponding
108 + world coordinate units.
109 + For example, if you wish to simulate a 50mm lens at f/2.0 in
110 + a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm,
111 + which corresponds to an effective aperture of 0.025 meters.
112   .SH EXAMPLES
113   To use
114   .I pinterp
# Line 112 | Line 134 | Greg Ward
134   .SH BUGS
135   This program really only works with perspective views.
136   .SH "SEE ALSO"
137 < pcomb(1), pinterp(1), pmblur(1), rcalc(1), rpict(1), vwright(1)
137 > pcomb(1), pinterp(1), pmblur(1), pmdblur(1), rcalc(1), rpict(1), vwright(1)

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