> See some screens. Default before and after
> using local weather. both with high z

Yes, just shows that you haven't understood the issue.

Fact 1: The Scattering Skydome shader doesn't work for low visibility
(<100 km) because the haze it creates (the yellow-black stuff) doesn't
blend with the terrain haze. It works for large visibility because then
the terrain covers the yellow-black stuff all the way to the horizon

Fact 2: Local Weather has its own vertical visibility model which
determines what you get to see, so you can press 'z' all day long and it
won't do anything. In particular, for performance reason Local Weather
usually restricts the visibility to less than 50 km.

Consequence: You go from a situation at high altitude where visibility is
maxed out and the scattering shader works to a situation where visibility
is quite restricted and the scattering shader's problems are not hidden
any more.

This has *nothing* to do with Local Weather, it's only related to the
value of /environment/visibility-m at your position. If you use a low
value with Global Weather, you'll see the same black stuff coming up, if
you instruct Local Weather to display a large aloft visibility, you get
this:

http://www.flightgear.org/forums/viewtopic.php?f=17&t=13339&start=15#p135799

Future advice: First: Understand issues involved. Then: start bitching if
necessary. Not the other way round.

Cheers,

* Thorsten


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