On 7/26/07, Vivian Meazza wrote:
> Incidentally, I have observed in both linux and osx in fg/osg
> that cloud layers don't work quite like I'd expect. If the
> weather is scattered clouds at 3000 ft and overcast at 5000,
> then when I'm sitting on the runway I see blue sky between
> the scattered clouds. It's not until I go above 3000 that
> suddenly there's overcast sky above me.
>
I'm rather afraid that this last is a "feature" rather than a "bug". As I
understand it, it is a consequence of the way osg orders/handles
transparencies. Not good at all.
In the old days when I first coded up the sky, we carefully drew the cloud
layers back to front in the correct order based on altitude so that they
would all show up correctly. However, this code was completely overhauled
at some point by Fred (I think) to hand some other issues with drawing
external models and transparancy that didn't exist when the sky code first
was developed. Then migrate all this over to OSG, and I have no idea how
Mathias set it up, but it certainly seems like we could fall back to drawing
the cloud layers in the correct order manually if need be. That said, I'm
useless at the moment for doing any OSG based work since I haven't gotten
over the first hurdle of understanding yet.
Regards,
Curt.
--
Curtis Olson - University of Minnesota - FlightGear Project
http://baron.flightgear.org/~curt/ http://www.humanfirst.umn.edu/
http://www.flightgear.org
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