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root/radiance/ray/doc/man/man1/pmdblur.1
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Comparing ray/doc/man/man1/pmdblur.1 (file contents):
Revision 1.1 by greg, Tue Jan 18 03:59:40 2005 UTC vs.
Revision 1.2 by greg, Tue Jan 18 20:19:56 2005 UTC

# Line 110 | Line 110 | This will be just enough to blur the boundaries of the
110   which may appear using
111   .I pmdblur
112   with a small number of time samples.
113 + .PP
114 + To simulate a particular camera's aperture, divide the focal length of
115 + the lens by the f-number, then convert to the corresponding
116 + world coordinate units.
117 + For example, if you wish to simulate a 50mm lens at f/2.0 in
118 + a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm,
119 + which corresponds to an effective aperture of 0.025 meters.
120   .SH EXAMPLES
121   To use
122   .I pinterp

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