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.\" RCSid "$Id$" |
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.TH IES2RAD 1 6/14/96 RADIANCE |
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.SH NAME |
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ies2rad - convert IES luminaire data to RADIANCE description |
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.SH SYNOPSIS |
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.B ies2rad |
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[ |
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.B options |
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] |
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[ |
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.B input .. |
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] |
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.SH DESCRIPTION |
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.I Ies2rad |
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converts one or more IES luminaire data files to the equivalent RADIANCE |
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scene description. |
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The light source geometry will always be centered at the origin aimed |
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in the negative z direction, with the 0 degree plane along the x axis. |
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Usually, two output files will be created for every input file, one |
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scene file (with a ".rad" suffix) and one data file (with a ".dat" |
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suffix). |
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If the IES input file includes tilt data, then another data file |
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will be created (with a "+.dat" suffix). |
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If the |
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.I \-s |
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option is used, the scene data will be sent to the standard output |
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instead of being written to a file. |
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Since the data file does not change with other options to |
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.I ies2rad, |
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this is a convenient way to specify different lamp colors and |
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multipliers inline in a scene description. |
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If the |
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.I \-g |
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option is used, then an octree file will be created (with the ".oct" |
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suffix). |
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The root portion of the output file names will be the same as the |
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corresponding input file, unless the |
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.I \-o |
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option is used. |
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The output files will be created in the current directory (no matter |
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which directory the input files came from) unless the |
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.I \-l |
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or |
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.I \-p |
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options are used. |
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.TH IES2RAD "1" "2021-10-26" "Radiance" "Radiance Manual Pages" |
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.SH "NAME" |
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ies2rad \- convert IES luminaire data to RADIANCE description |
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.SH "SYNOPSIS" |
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\fBies2rad\fP [ \fIoptions\fP ] [ \fIfile file .\|.\|.\&\fP ] |
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.SH "DESCRIPTION" |
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\fIIes2rad\fP converts one or more IES luminaire data files to |
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an equivalent RADIANCE scene description. The light source geometry |
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will always be centered at the origin aimed in the negative Z |
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direction, with the 0 degree plane along the x-axis\(emthe IES |
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photometric horizontal or length. The IES width is oriented along |
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the y axis, and the IES up becomes the RADIANCE z-axis. |
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.PP |
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.I Ies2rad |
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assigns light source colors based on information in a lamp lookup table. |
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Since most lamps are distinctly colored, |
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The IES(NA) LM-63 standard provides a limited range of light |
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source shapes (\(lqluminous openings\(rq), different in each |
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version of the standard. Of these shapes, \fIies2rad\fP supports |
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rectangles, boxes, points (as 1mm spheres), disks (as 1mm high |
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vertical cylinders), vertical cylinders, and spheres. Some versions |
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of the standard also define ellipses, ellipsoids, and horizontal |
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cylinders. \fIIes2rad\fP will approximate near-circular ellipses |
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as disks, near-spherical ellipsoids as spheres, and horizontal |
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cylinders as boxes. |
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.PP |
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The 1995 IES standard once included the materials and geometry |
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format (MGF) which can describe detailed luminaire and light |
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source geometry, but it was never used. \fIIes2rad\fP still supports |
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MGF. |
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.PP |
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\fIIes2rad\fP assigns light source colors based on information |
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in a lamp lookup table. Since most lamps are distinctly colored, |
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it is often desirable to override this lookup procedure and use |
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a neutral value that will produced color-balanced renderings. |
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In general, it is important to consider lamp color when an odd assortment |
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of fixture types is being used to illuminate the same scene, and |
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the rendering can always be balanced by pfilt(1) to a specific white value |
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later. |
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.TP 10n |
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.BI -l \ libdir |
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Set the library directory path to |
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.I libdir. |
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This is where all relative pathnames will begin for output file names. |
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For light sources that will be used by many people, this should be |
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set to some central location included in the RAYPATH environment variable. |
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The default is the current working directory. |
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In general, it is important to consider lamp color when an odd |
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assortment of fixture types is being used to illuminate the same |
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scene, and the rendering can always be balanced by \fBpfilt\fP(1) |
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to a specific white value later. |
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.SH "OPTIONS" |
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.TP |
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.BI -p \ prefdir |
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Set the library subdirectory path to |
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.I prefdir. |
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This is the subdirectory from the library where all output files will |
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be placed. |
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It is often most convenient to use a subdirectory for the storage of |
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light sources, since there tend to be many files and placing them all |
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in one directory is very messy. |
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The default value is the empty string. |
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.BI "\-l" " libdir" |
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Set the library directory path to \fIlibdir\fP. This is where |
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all relative pathnames will begin for output file names. For |
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light sources that will be used by many people, this should be |
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set to some central location included in the RAYPATH environment |
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variable. The default is the current working directory. |
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.TP |
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.BI -o \ outname |
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Set the output file name root to |
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.I outname. |
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This overrides the default output file name root which is the same as the |
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input file. |
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This option may be used for only one input file, and is required when |
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reading data from the standard input. |
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.BI "\-p" " prefdir" |
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Set the library subdirectory path to \fIprefdir\fP. This is the |
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subdirectory from the library where all output files will be |
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placed. It is often most convenient to use a subdirectory for |
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the storage of light sources, since there tend to be many files |
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and placing them all in one directory is very messy. The default |
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value is the empty string. |
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.TP |
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.BR -s |
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Send the scene information to the standard output rather than a |
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separate file. |
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This is appropriate when calling |
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.I ies2rad |
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from within a scene description via an inline command. |
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The data file(s) will still be written based on the output file name |
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root, but since this information is unaffected by command line options, |
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it is safe to have multiple invocations of |
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.I ies2rad |
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using the same input file and different output options. |
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The |
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.I \-s |
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.BI "\-o" " outname" |
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Set the output file name root to \fIoutname\fP. This overrides |
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the default output file name root which is the same as the input |
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file. This option may be used for only one input file, and is |
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required when reading data from the standard input. |
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.TP |
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.B "\-s" |
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Send the scene information to the standard output rather than |
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a separate file. This is appropriate when calling \fIies2rad\fP |
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from within a scene description via an inline command. The data |
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file(s) will still be written based on the output file name root, |
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but, since this information is unaffected by command line options, |
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it is safe to have multiple invocations of \fIies2rad\fP using |
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the same input file and different output options. The \fI\-s\fP |
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option may be used for only one input file. |
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.TP |
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.BI -d units |
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Output dimensions are in |
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.I units, |
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which is one of the letters 'm', 'c', 'f', or 'i' for meters, |
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centimeters, feet or inches, respectively. |
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The letter specification may be followed by a slash ('/') and an |
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optional divisor. |
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For example, |
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.I \-dm/1000 |
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would be millimeters. |
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The default output is in meters, regardless of the original units in |
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the IES input file. |
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Note that there is no space in this option. |
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.BI "\-d" " units" |
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Output dimensions are in \fIunits\fP, which is one of the letters |
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'm', 'c', 'f', or 'i' for meters, centimeters, feet or inches, |
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respectively. The letter specification may be followed by a slash |
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('/') and an optional divisor. For example, \fI\-dm/1000\fP would |
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be millimeters. The default output is in meters, regardless of |
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the original units in the IES input file. Note that there is |
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no space in this option. |
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.TP |
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.BI -i \ rad |
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Ignore the crude geometry given by the IES input file and use instead an illum |
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sphere with radius |
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.I rad. |
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This option may be useful when the user wishes to add a more accurate |
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geometric description to the light source model, though this need |
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is obviated by the recent LM-63-1995 specification, which uses MGF |
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detail geometry. |
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(See |
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.I \-g |
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option below.)\0 |
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.BI "\-i" " rad" |
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Ignore the crude geometry given by the IES input file and use |
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instead an illum sphere with radius \fIrad\fP. This option may |
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be useful when the user wishes to add a more accurate geometric |
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description to the light source model, though this need is obviated |
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by the recent LM-63-1995 specification, which uses MGF detail |
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geometry. (See \fI\-g\fP option below.) |
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.TP |
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.BR -g |
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If the IES file contains MGF detail geometry, compile this geometry into |
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a separate octree and create a single instance referencing it |
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instead of including the converted geometry directly in the Radiance |
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output file. |
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This can result in a considerable memory savings for luminaires |
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which are later duplicated many times in a scene, though the |
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appearance may suffer for certain luminaires since the enclosed glow |
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sources will not light the local geometry as they would otherwise. |
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.B "\-g" |
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If the IES file contains MGF detail geometry, compile this geometry |
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into a separate octree and create a single instance referencing |
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it instead of including the converted geometry directly in the |
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Radiance output file. This can result in a considerable memory |
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savings for luminaires which are later duplicated many times |
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in a scene, though the appearance may suffer for certain luminaires |
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since the enclosed glow sources will not light the local geometry |
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as they would otherwise. |
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.TP |
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.BI -f \ lampdat |
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Use |
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.I lampdat |
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instead of the default lamp lookup table (lamp.tab) to map lamp |
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names to xy chromaticity and lumen depreciation data. |
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.BI "\-f" " lampdat" |
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Use \fIlampdat\fP instead of the default lamp lookup table (lamp.tab) |
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to map lamp names to xy chromaticity and lumen depreciation data. |
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It is often helpful to have customized lookup tables for specific |
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manufacturers and applications. |
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.TP |
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.BI -t \ lamp |
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Use the given lamp type for all input files. |
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Normally, |
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.I ies2rad |
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.BI "\-t" " lamp" |
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Use the given lamp type for all input files. Normally, \fIies2rad\fP |
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looks at the header lines of the IES file to try and determine |
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what lamp is being used in the fixture. |
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If any of the lines is matched by a pattern in the lamp lookup |
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table (see the -f option above), that color and depreciation factor will |
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be used instead of the default (see the -c and -u options). |
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The |
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.I lamp |
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specification is also looked up in the lamp table unless it is |
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set to "default", in which case the default color is used instead. |
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what lamp is being used in the fixture. If any of the lines is |
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matched by a pattern in the lamp lookup table (see the \fB\-f\fP |
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option above), that color and depreciation factor will be used |
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instead of the default (see the \fB\-c\fP and \fB\-u\fP options). |
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The \fIlamp\fP specification is also looked up in the lamp table |
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unless it is set to \(lqdefault\(rq, in which case the default |
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color is used instead. |
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.TP |
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.BI -c " red grn blu" |
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Use the given color if the type of the lamp is unknown or |
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the -t option is set to "default". |
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If unspecified, the default color will be white. |
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.BI "\-c" " red grn blu" |
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Use the given color if the type of the lamp is unknown or the |
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\fB\-t\fP option is set to \(lqdefault\(rq. If unspecified, the |
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default color will be white. |
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.TP |
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.BI -u \ lamp |
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Set the default lamp color according to the entry for |
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.I lamp |
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in the lookup table (see the -f option). |
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This is the color that will be used if the input specification |
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does not match any lamp type patterns. |
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This option is used instead of the -c option. |
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.BI "\-u" " lamp" |
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Set the default lamp color according to the entry for \fIlamp\fP |
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in the lookup table (see the \fB\-f\fP option). This is the color |
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that will be used if the input specification does not match any |
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lamp type patterns. This option is used instead of the \fB\-c\fP |
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option. |
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.TP |
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.BI -m \ factor |
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Multiply all output quantities by |
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.I factor. |
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This is the best way to scale fixture brightness for different lamps, but care |
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.BI "\-m" " factor" |
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Multiply all output quantities by \fIfactor\fP. This is the best |
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way to scale fixture brightness for different lamps, but care |
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should be taken when this option is applied to multiple files. |
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.SH EXAMPLE |
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To convert a single IES data file in inches with color balanced output |
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and 15% lumen depreciation, |
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creating the files "fluor01.rad" and "fluor01.dat" in the current directory: |
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.IP "" .2i |
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.SH "EXIT STATUS" |
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0 if successful, 1 if not. |
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.SH "ENVIRONMENT" |
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.TP |
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RAYPATH |
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Colon-separated list of directories to search for lamp lookup |
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table |
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.SH "FILES" |
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The output files will be created in the current directory (no |
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matter which directory the input files came from) unless the |
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\fI\-l\fP or \fI\-p\fP options are used. |
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.TP |
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.RI "<" "luminaire" ">.ies" |
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The IES LM-63 input file. May also be from the standard input. |
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If the standard input is the source, the \fB-o\fP option must |
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be specified, to provide a filename. |
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.TP |
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.RI "<" "luminaire" ">.rad" |
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> |
The RADIANCE scene description. May also be sent to the standard |
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> |
output. |
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> |
.TP |
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.RI "<" "luminaire" ">.dat" |
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> |
The IES candela values. |
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> |
.TP |
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.RI "<" "luminaire" ">+.dat" |
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> |
The IES tilt data. If tilt data is not provided (it is mostly |
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needed for luminaires which use metal halide lamps), this file |
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is not generated. |
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> |
.TP |
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.RI "<" "luminaire" ">.oct" |
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> |
If the \fB-g\fP option is given, the compiled MGF geometry is |
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placed in this octree file. |
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.TP |
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.RI "<" "RAYPATH" ">/lamp.tab" |
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lamp table |
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.SH "EXAMPLES" |
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To convert a single IES data file in inches with color balanced |
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output and 15% lumen depreciation, creating the files \(lqfluor01.rad\(rq |
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and \(lqfluor01.dat\(rq in the current directory: |
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.RS 2n |
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.sp 0.25 |
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|
ies2rad -di -t default -m .85 fluor01.ies |
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+ |
.sp 0.25 |
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+ |
.RE |
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|
.PP |
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To convert three IES files of various types to tenths of a foot and put |
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them in the library "/usr/local/lib/ray" subdirectory "source/ies": |
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.IP "" .2i |
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> |
To convert three IES files of various types to tenths of a foot |
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> |
and put them in the library \(lq/usr/local/lib/ray\(rq subdirectory |
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\(lqsource/ies\(rq: |
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.RS 2n |
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.sp 0.25 |
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|
ies2rad -df/10 -l /usr/local/lib/ray -p source/ies ies01 ies02 ies03 |
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.sp 0.25 |
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+ |
.RE |
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|
.PP |
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|
To convert a single file and give the output a different name: |
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.IP "" .2i |
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> |
.RS 2n |
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> |
.sp 0.25 |
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|
ies2rad -o fluorescent ies03 |
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.SH ENVIRONMENT |
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RAYPATH directories to search for lamp lookup table |
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.SH AUTHOR |
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.sp 0.25 |
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.RE |
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.SH "REFERENCES" |
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> |
.TP |
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LM-63-86, LM-63-91, LM-63-95, LM-63-02, LM-63-19 |
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\fIIES Standard File Format for the Electronic Transfer of Photometric |
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Data and Related Information\fP. IESNA - Lighting Measurement |
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and Testing. Illuminating Engineering Society, 1986, 1991, 1995, |
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2002, 2019. |
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> |
.TP |
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LM-75-01 |
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\fIGoniophotometer Types and Photometric Coordinates\fP. New |
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York: Illuminating Engineering Society of North America, 2001. |
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> |
.TP |
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The Materials and Geometry Format |
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Greg Ward. \fIThe Materials and Geometry Format\fP <https://floyd.lbl.gov/mgf/mgfdoc.pdf>. |
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Lawrence Berkeley Laboratory, 1996. |
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.SH "AUTHOR" |
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|
Greg Ward |
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< |
.SH BUGS |
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> |
.SH "BUGS" |
| 209 |
|
In pre-1991 standard IES files, all header lines will be examined |
| 210 |
< |
for a lamp table string match. |
| 211 |
< |
In post-1991 standard files, only those lamps with the [LAMP] or |
| 212 |
< |
[LAMPCAT] keywords will be searched. |
| 213 |
< |
The first match found in the file is always the one used. |
| 199 |
< |
This method of assigning colors to fixtures is less than perfect, |
| 210 |
> |
for a lamp table string match. In post-1991 standard files, only |
| 211 |
> |
those lamps with the [LAMP] or [LAMPCAT] keywords will be searched. |
| 212 |
> |
The first match found in the file is always the one used. This |
| 213 |
> |
method of assigning colors to fixtures is less than perfect, |
| 214 |
|
and the IES would do well to include explicit spectral information |
| 215 |
|
somehow in their specification. |
| 216 |
|
.PP |
| 217 |
< |
The IESNA LM-63 specification prior to 1995 provided three basic source |
| 218 |
< |
shapes, rectangular, round, and elliptical. |
| 219 |
< |
The details of these shapes is vague at best. |
| 206 |
< |
Rectangular sources will always be rectangular, but ies2rad will |
| 207 |
< |
approximate round sources as spherical if the height is close to |
| 208 |
< |
or greater than the width and length, and as a ring otherwise. |
| 209 |
< |
Elliptical sources are treated the same as round sources. |
| 210 |
< |
The 1995 standard rectifies this problem by including detailed |
| 211 |
< |
luminaire geometry as MGF data, though nothing in the standard |
| 212 |
< |
requires manufacturers to provide this information. |
| 217 |
> |
Not all luminous openings defined in the IES standard are supported. |
| 218 |
> |
So far, however, we have yet to find IES files which use the |
| 219 |
> |
unsupported shapes. |
| 220 |
|
.SH "SEE ALSO" |
| 221 |
< |
mgf2rad(1), oconv(1), pfilt(1), rad2mgf(1), rpict(1), xform(1) |
| 221 |
> |
\fBlamp.tab\fP(5), \fBmgf2rad\fP(1), \fBoconv\fP(1), \fBpfilt\fP(1), |
| 222 |
> |
\fBrad2mgf\fP(1), \fBrpict\fP(1), \fBxform\fP(1) |
