[osg-submissions] ReaderWriterOBJ enhancements

[Stephan Maximilian Huber]

Hi Robert,

attached you'll find a first implementation for the obj-plugin to write 
obj-files. It is not feature complete but usable.

Known issues:
* not all materials are handled correctly (especially when using 
osg::StateAttribute::OVERRIDE), not all properties are supported
* could not test point and lines, all of my programs which are capable 
to read obj-files only import triangle-meshes.
* only simple texture-handling

I hope you'll find this submission useful and it gets integrated into 
the core-osg. I know the obj-format is very old, I got the 
collada-plugin working on OS X, but none of my 3d-programs can import 
collada-files so I extended the obj-plugin.

cheers,
Stephan
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