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Revision 1.1 by greg, Thu Mar 27 01:26:55 2025 UTC vs.
Revision 1.4 by greg, Thu May 22 21:39:42 2025 UTC

# Line 64 | Line 64 | option is given, all data is sent to the standard outp
64   which may be a sequence of Radiance pictures as understood by
65   .I ra_rgbe(1)
66   in the case of a multi-column input matrix.
67 < (Note that there is currently no Radiance tool that understands a
68 < concatenated series of float or spectral pictures.)\0
67 > (Note that there is currently no Radiance tool that fully
68 > handles a concatenated series of float or spectral pictures.)\0
69   .PP
70   The
71   .I \-N
# Line 85 | Line 85 | gensky 6 21 12 | genskyvec | rmtxop Blinds30.xml
85   Window2.dmx - | pvsum view%03d.hdr > view_6-21-12.hdr
86   .PP
87   To compute a set of hourly spectral pictures at SFO airport
88 < from a weather tape and set of Tregenza component pictures:
88 > from a weather tape and set of Tregenza component pictures using
89 > 10 processes:
90   .IP "" .2i
91 < gensdaymtx sfo.epw | pvsum -o timestep%04d.hsr tregcomp%03d.hsr
91 > gensdaymtx -of sfo.epw | pvsum -o timestep%04d.hsr -N 10 tregcomp%03d.hsr
92   .SH NOTES
93 < This tool is annoyingly similar to
93 > This tool overlaps with
94   .I dctimestep,
95 < but provides some important capabilities.
96 < First,
95 > but provides some missing capabilities.
96 > Foremost,
97   .I pvsum
98   reads and can produce spectral pictures and matrices, whereas
99   .I dctimestep
100   expects and requires 3-component pictures and matrices throughout.
101 < Changing the data structures in
101 < .I dctimestep
102 < proved too difficult and likely to
103 < lead to a less efficient implementation, especially on systems with
104 < limited memory.
105 < In contrast,
101 > In addition,
102   .I pvsum
103   accelerates picture sums on Unix systems with more
104 < memory and processint ability.
105 < Second, operation was simplified by focusing on the Daylight Coefficient
104 > memory and CPU cores.
105 > Operations were simplified by focusing on the Daylight Coefficient
106   command form, where the DC matrix is represented as a collection of
107   pictures.
108 < By excluding the three or four other operation modes of
113 < .I dctimestep,
114 < new features could be explored in
115 < .I pvsum.
116 < For example,
108 > Finally,
109   .I pvsum
110 < can write picture data to a series of commands, which
111 < .I dctimestep
120 < does not support.
110 > offers more flexible floating-point support and
111 > can output to commands as well as files.
112   .SH AUTHOR
113   Greg Ward
114   .SH "SEE ALSO"

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