On Sat, 1 May 2004 09:15:09 +0200, you wrote:

>I think we have three possible solutions from the FDM <-> Flightgear interface 
>point of view.
>
>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.
>
>2. On every update push *all* tiles in an environment of the aircraft to the 
>FDM and leave it to the FDM to fiddle with that information.
>
>3. Provide a callback function to query a surface tile for a given lat/lon 
>pair.

I am not sure I understand 3, so excuse me should I just reformulate
it:

4. There is one callback providing the level (altitude) for lat/lon.
(and no normal!). The FDM is free to call it three times and from the
three results create a normal, which does not need to coincide with
the normal of any terrain poly. Actually, the normal computation might
be part of flightgear (and not the FDM).

>
>    Greetings
>
>       Mathias

Bye bye,
Wolfram.


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