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.\" RCSid "$Id" |
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.TH MGF2RAD 1 4/12/95 RADIANCE |
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.SH NAME |
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mgf2rad - convert Materials and Geometry Format file to RADIANCE description |
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.SH SYNOPSIS |
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.B mgf2rad |
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[ |
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.B "\-m matfile" |
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][ |
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.B "\-e mult" |
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][ |
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.B "\-g dist" |
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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 Mgf2rad |
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converts one or more Materials and Geometry Format (MGF) |
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files to a RADIANCE scene description. |
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By definition, all output dimensions are in meters. |
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The material names and properties |
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for the surfaces will be those assigned in MGF. |
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Any materials not defined in MGF will result in an error during |
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translation. |
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Light sources are described inline as IES luminaire files, and |
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.I mgf2rad |
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calls the program |
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.I ies2rad(1) |
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to translate these files. |
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If an IES file in turn contains an MGF description of the local |
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fixture geometry, this may result in a recursive call to |
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.I mgf2rad, |
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which is normal and should be transparent. |
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The only side-effect of this additional translation is the |
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appearance of other RADIANCE scene and data files produced |
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automatically by |
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.I ies2rad. |
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.PP |
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The |
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.I \-m |
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option may be used to put all the translated materials into a separate |
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RADIANCE file. |
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This is not always advisable, as any given material name may be |
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reused at different points in the MGF description, and writing them |
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to a separate file loses the contextual association between |
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materials and surfaces. |
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As long as unique material names are used throughout the MGF |
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description and material properties are not redefined, there |
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will be no problem. |
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Note that this is the only way to get all the translated materials |
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into a single file, since no output is produced for unreferenced |
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materials; i.e. translating just the MGF materials does not work. |
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.PP |
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The |
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.I \-e |
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option may be used to multiply all the emission values by the |
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given |
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.I mult |
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factor. |
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The |
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.I \-g |
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option may be used to establish a glow distance (in meters) |
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for all emitting surfaces. |
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These two options are employed principally by |
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.I ies2rad, |
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and are not generally useful to most users. |
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.SH EXAMPLE |
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To translate two MGF files into one RADIANCE materials file and |
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one geometry file: |
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.IP "" .2i |
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mgf2rad -m materials.rad building1.mgf building2.mgf > building1+2.rad |
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.PP |
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To create an octree directly from two MGF files and one RADIANCE |
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file: |
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.IP "" .2i |
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oconv '\\!mgf2rad materials.mgf scene.mgf' source.rad > scene.oct |
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.SH FILES |
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tmesh.cal Used to smooth polygonal geometry |
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.br |
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*.rad RADIANCE source descriptions created by ies2rad |
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.br |
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*.dat RADIANCE source data created by ies2rad |
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.br |
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source.cal Used for IES source coordinates |
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.SH AUTHOR |
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Greg Ward |
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.SH "SEE ALSO" |
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ies2rad(1), mgf2meta(1), obj2rad(1), oconv(1), rad2mgf(1), xform(1) |
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.PP |
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MGF web site "http://radsite.lbl.gov/mgf/HOME.html" |
