NMG-RIB
1
BRL-CAD
BRL-CAD

# nmg-rib

Convert polygonal NMG to Renderman Interface Bytestream (RIB)

      nmg-rib
        -t
        database.nmgnmg_solid

## DESCRIPTION

The `nmg-rib` program reads the geometry database database.nmg and converts the named polygonal NMG solids to RIB format polygons. If the `-t` option is given, the NMG solid will be triangulated first. If NMG a vertexuse normal is present for a vertexuse, it is used as the RIB vertex normal. Otherwise, the NMG face normal is used.

## EXAMPLE

    % mged box.g
    BRL-CAD Release 4.1   Graphics Editor (MGED)
        Tue Dec 15 15:49:30 EST 1992, Compilation 9
        stay@wolf:/m/dist4.1/mged

    mged> l box.s
    box.s:  ARB8
    	1 (0.5, -0.5, -0.5)
    	2 (0.5, 0.5, -0.5)
    	3 (0.5, 0.5, 0.5)
    	4 (0.5, -0.5, 0.5)
    	5 (-0.5, -0.5, -0.5)
    	6 (-0.5, 0.5, -0.5)
    	7 (-0.5, 0.5, 0.5)
    	8 (-0.5, -0.5, 0.5)
    mged> facetize box.nmg box.s
    facetize:  tessellating primitives with tolerances a=0, r=0.01, n=0
    facetize:  evaluating Boolean expressions
    facetize:  converting NMG to database format
    facetize:  wrote 6.38 Kbytes to database
    mged> q
    % nmg-rib box.g box.nmg
    Polygon "P" [ -0.5 -0.5 0.5  0.5 -0.5 0.5  0.5 0.5 0.5  -0.5 0.5 0.5   ] "N" [ 0 0 1  0 0 1  0 0 1  0 0 1   ]
    Polygon "P" [ 0.5 0.5 -0.5  0.5 -0.5 -0.5  -0.5 -0.5 -0.5  -0.5 0.5 -0.5   ] "N" [ 0 0 -1  0 0 -1  0 0 -1  0 0 -1   ]
    Polygon "P" [ 0.5 0.5 0.5  0.5 0.5 -0.5  -0.5 0.5 -0.5  -0.5 0.5 0.5   ] "N" [ 0 1 0  0 1 0  0 1 0  0 1 0   ]
    Polygon "P" [ -0.5 -0.5 -0.5  0.5 -0.5 -0.5  0.5 -0.5 0.5  -0.5 -0.5 0.5   ] "N" [ 0 -1 0  0 -1 0  0 -1 0  0 -1 0   ]
    Polygon "P" [ -0.5 -0.5 -0.5  -0.5 -0.5 0.5  -0.5 0.5 0.5  -0.5 0.5 -0.5   ] "N" [ -1 0 0  -1 0 0  -1 0 0  -1 0 0   ]
    Polygon "P" [ 0.5 -0.5 0.5  0.5 -0.5 -0.5  0.5 0.5 -0.5  0.5 0.5 0.5   ] "N" [ 1 0 0  1 0 0  1 0 0  1 0 0   ]
    %

## AUTHOR

Lee A. Butler

## COPYRIGHT

This software is Copyright (c) 1994-2013 by the United States Government as represented by U.S. Army Research Laboratory.

## BUG REPORTS

Reports of bugs or problems should be submitted via electronic mail to <devs@brlcad.org>.