On Sat, May 01, 2004 at 09:15:09AM +0200, Mathias Fröhlich wrote:
> 1. Have a callback function in FGInterface which is able to provide you a 
> terrain level and a surface normal for a given lat/lon pair.

I'd even suggest also giving linear and rotational velocities for the
surface polygon(s).  This will allow to model things like A/C carriers,
oil platforms moving and pitching in the sea.  And earthquakes, if
somebody cares :-)

Kind regards,

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