This file is a modified obj exporter for Blender.
It will export vertex group weights for armature deformation in a game.
All additional data is prefixed with #@ as this makes other readers ignore it.

The file can replace the old exporter found in the directory equivalent to:
C:\Program Files\Blender Foundation\Blender\2.62\scripts\addons\io_scene_obj
in your blender installation(as of blender 2.62)

Vertex group names are listed at the top of the file as such:
#@N vgroupname1
#@N vgroupname2 
...

Each vertex (v prefix) has appended a list of vertex group membership and weight:
#@ vgroupindex1 vgroupweight1 vgroupindex2 vgroupweight2 ...
Example:
v 0.407165 0.964902 1.439075 #@ 3 0.300000 4 0.600000 6 0.250000
Wherein each vgroupindex indicates that the vertex is a member of the group with that index,
and the weight indicates the weight of that group membership for this vertex.
The name of a group with a given index can be found in the list at the top of the file.
The indices(and the list) are 0-indexed.

This has only been tested for files containing a single object.

Licensed under GPL(see GPL.txt for more info).