v = vertex
vt = texture vertex  (UV)
vn = normal of vertex
f = facet (polygon)
fo = facet also
l = line (can also represent spline)
g = group (sets the group for the facets that follow)
usemtl = material (sets the material group for the facets that follow)
mtllib = references a corresponding .mtl file that contains basic material settings for each material group

f is followed by up to three references: v/vt/vn for each vertex of the polygon.

Think, I pulled that from memory (though I double checked the order of the vertex types for 'f'). :)

Robert

ETA: Go here for a PDF which is probably the most definitive format specification for Wavefront OBJ around: http://www.wotsit.org/search.asp?page=2&s=3d

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

Contact Me | Kuroyume's DevelopmentZone