Here is another hint:
http://wiki.flightgear.org/index.php/Howto:_Understand_console_output#Warning:_TangentSpaceGenerator:_unknown_primitive_mode_9

Torsten
> Hi, John
> 
> Thanks for your answer and explanation, though that is somewhere out of my
> know how skill.
> We can live with such message.
> 
> Alva
> 
> 2010/12/20 John Denker <j...@av8n.com>
> 
> > On 12/20/2010 05:42 AM, henri orange wrote:
> > >   At FG load, i get a lot of these warning messages:
> > >
> > > TangentSpaceGenerator: unknown primitive mode 9
> > >
> > > Is it just me ? is there any possibility to avoid it ?
> >
> > It's not just you.
> >
> > There are at least two or three bugs involved here.
> >
> > 1) It is a bug that one part of OSG would generate a primitive mode
> > that cannot be handled by other parts of OSG.  Indeed, a comparison of
> > .../include/osg/PrimitiveSet with
> > .../src/osgUtil/TangentSpaceGenerator.cpp suggests that there are several
> > primitive modes that could be generated but not handled.
> >
> > With very slightly cleverer coding, the OSG folks could have detected
> > this situation at compile time, and could have fixed it a long time ago.
> >
> > 2) It is a bug in OSG that the error message is remarkably uninformative.
> > The message doesn't say what caused the problem.  It doesn't say how
> > serious the problem is, or what might be the consequences of ignoring
> > the problem.  It gives no clue how to avoid the problem ... unless you
> > want to download the source and reverse-engineer a large, complex, and
> > virtually uncommented software system.
> >
> > In particular, the message is presumably provoked by some object in
> > the scene, but the message gives no clue as to what the identity of
> > the offending object.
> >
> > 3) It's not clear to me whether this can be considered a bug in FG,
> > or whether changing FG so as to avoid provoking the OSG bug would
> > be worth the trouble.  Changing FG would be a royal pain, because
> > of item (2) above.
> >
> > On 04/22/2010 03:12 PM, Tim Moore wrote:
> > >> It would be best to get the polygons out of the loaded geometry. The
> > >> INDEX_MESH optimizer that was recently added to OSG will do this.
> >
> > How recently was it added?
> >
> > How soon will it fix the problem?
> >
> > Installing the latest OSG SVN does not appear to be sufficient to
> > fix the problem.
> >
> >
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