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which may be a sequence of Radiance pictures as understood by |
65 |
|
.I ra_rgbe(1) |
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|
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 |
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> |
handles a concatenated series of float or spectral pictures.)\0 |
69 |
|
.PP |
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The |
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.I \-N |
85 |
|
Window2.dmx - | pvsum view%03d.hdr > view_6-21-12.hdr |
86 |
|
.PP |
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|
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: |
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|
.IP "" .2i |
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< |
gensdaymtx sfo.epw | pvsum -o timestep%04d.hsr tregcomp%03d.hsr |
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> |
gensdaymtx -of sfo.epw | pvsum -o timestep%04d.hsr -N 10 tregcomp%03d.hsr |
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|
.SH NOTES |
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< |
This tool is annoyingly similar to |
93 |
> |
This tool overlaps with |
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|
.I dctimestep, |
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< |
but provides some important capabilities. |
96 |
< |
First, |
95 |
> |
but provides some missing capabilities. |
96 |
> |
Foremost, |
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|
.I pvsum |
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|
reads and can produce spectral pictures and matrices, whereas |
99 |
|
.I dctimestep |
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|
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 |
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|
accelerates picture sums on Unix systems with more |
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< |
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 |
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|
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 |
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< |
can write picture data to a series of commands, which |
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< |
.I dctimestep |
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< |
does not support. |
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> |
offers more flexible floating-point support and |
111 |
> |
can output to commands as well as files. |
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|
.SH AUTHOR |
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Greg Ward |
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|
.SH "SEE ALSO" |