On Mon, Aug 1, 2011 at 10:18 AM, Durk Talsma wrote:
> Hi Stuart,
> On 30 Jul 2011, at 21:31, Stuart Buchanan wrote:
>
>>
>> So, I quickly wrote an alternative to the current Nasal system geodinfo(),
>> using the groundcache instead of the current scenery method.
>>
>
> This sounds very interesting: As far as I can tell, the AI system still makes
> use of scenery.get_elevation_m(), as shown in AIBase.cxx (line 516):
>
> 516 bool FGAIBase::getGroundElevationM(const SGGeod& pos, double& elev,
> 517 const SGMaterial** material) const {
> 518 return globals->get_scenery()->get_elevation_m(pos, elev, material,
> 519 model.get());
> 520 }
>
> I always thought that get_elevation_m would be using the ground cache itself,
> but apparently that is not the case? If so, it seems to me that changing the
> AI system to actually use the ground cache could yield another performance
> increase.
>
> If you have any pointers on how this could be changed in an efficient way,
> I'd be happy to hear about it. :-)
I'm looking to see whether we should just have a single way to query
the ground elevation using the groundcache, and use that everywhere.
However, the AI call you quote specifically excludes the model itself,
and I need to determine how to do that using the groundcache.
-Stuart
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