NMG-RIB(1)

NAME
nmg-rib - Convert polygonal NMG to Renderman Interface Bytestream (RIB)

SYNOPSIS
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