On Jan 5, 2008 8:56 PM, Csaba Halász <> wrote:
> Hi!
>
> I have changed Tiago's patch somewhat, it now iterates over all the
> ground layers.
> Debug output looks like this for KSFO:
>
> Found tower ground layer at 124.323ft, material <unnamed>
> Found tower ground layer at 114.536ft, material <unnamed>
> Found tower ground layer at 82.3405ft, material <unnamed>
> Found tower ground layer at 42.9577ft, material <unnamed>
> Found tower ground layer at 5.36808ft, material pc_tiedown
> Setting tower viewpoint altitude 112.368
>
> I was hoping to find a layer like "Grass" or "Ground" somewhere, but
> no. So for now, the code picks the lowest layer, which might not work
> if the tower is sunk into the ground as other objects frequently are.
> I tested LHBP and that worked (even had grass material).
>
> Also attached is a patch to apt.dat (gunzip, patch, gzip) that updates
> KSFO and KNID tower viewpoint based on the scenery.
> I am not sure we can trust the tower position in apt.dat, since the
> elevation values are frequently obvious nonsense (500 for KSFO and 0
> for KNID).
>
> Please comment.
Isn't the airport altitude also reported in the same file?
We should be able to set the tower altitude in MSL to apt_alt + tower_alt.
It seems like extreme overkill to actually query the ground elevation.
Regards,
Curt.
--
Curtis Olson: http://baron.flightgear.org/~curt/
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