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.\" RCSid "$Id: rad2mgf.1,v 1.3 2007/09/04 17:36:41 greg Exp $"
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.TH RAD2MGF 1 5/15/95 RADIANCE
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.SH NAME
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rad2mgf - convert RADIANCE scene description to Materials and Geometry Format
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.SH SYNOPSIS
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.B rad2mgf
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[
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.B \-dU
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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 Rad2mgf
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converts one or more RADIANCE scene files
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to the Materials and Geometry Format (MGF).
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Input units are specified with the
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.I \-mU
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option, where
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.I U
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is one of 'm' (meters), 'c' (centimeters), 'f' (feet) or 'i'
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(inches).
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The assumed unit is meters, which is the required output unit for
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MGF (thus the need to know).
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If the input dimensions are in none of these units, then the user
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should apply
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.I xform(1)
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with the
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.I \-s
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option to bring the units into line prior to translation.
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.PP
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The MGF material names and properties
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for the surfaces will be those assigned in RADIANCE.
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If a referenced material has not been defined, then its name will
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be invoked in the MGF output without definition, and the description
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will be incomplete.
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.SH LIMITATIONS
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Although MGF supports all of the geometric types and the most
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common material types used in RADIANCE, there is currently no
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support for advanced BRDF materials, patterns, textures or mixtures.
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Also, the special types "source" and "antimatter" are not supported,
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and all light source materials are converted to simple diffuse emitters
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(except "illum" materials, which are converted to their alternates).
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These primitives are reproduced as comments in the output and
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must be replaced manually if necessary.
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.PP
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The RADIANCE "instance" and "mesh" types aretreated specially.
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.I Rad2mgf
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converts each instance or mesh to an MGF include statement,
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using the corresponding
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transformation and a file name derived from the octree or mesh name.
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(The original octree/mesh suffix is replaced by ".mgf".)\0
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For this to work, the user must separately create the referenced
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MGF files from the original RADIANCE descriptions.
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The description file names can usually be determined using the
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.I getinfo(1)
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command run on the octrees in question.
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.SH EXAMPLE
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To convert three RADIANCE files (in feet) to one MGF file:
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.IP "" .2i
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rad2mgf \-df file1.rad file2.rad file3.rad > scene.mgf
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.PP
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To translate a RADIANCE materials file to MGF:
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.IP "" .2i
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rad2mgf materials.rad > materials.mgf
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.SH AUTHOR
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Greg Ward
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.SH "SEE ALSO"
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getinfo(1), ies2rad(1), mgf2meta(1), mgf2rad(1), obj2rad(1), oconv(1), xform(1)
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.PP
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MGF web site "http://radsite.lbl.gov/mgf/HOME.html"
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