> With an ati 5870 on win7 64bit the transition effect is not working as
> expected.
> I get what is best described as fast flickering artifacts... but have a
> look at the screen shoots yourself.
> http://i217.photobucket.com/albums/cc283/oliunterderbruecke/flightgear/fgfs%20bugs/fgfs2012-12-1323-40-34-02.jpg
>
> http://i217.photobucket.com/albums/cc283/oliunterderbruecke/flightgear/fgfs%20bugs/fgfs2012-12-1323-40-37-19.jpg
>
> http://i217.photobucket.com/albums/cc283/oliunterderbruecke/flightgear/fgfs%20bugs/fgfs2012-12-1323-41-10-13.jpg

Aw, that looks bad... I've never seen anything like, so my first guess would be 
that it's one of these NVIDIA vs. ATI issues (which are really tough to 
understand from my side with just NVIDIA cards available). For reference - I've 
seen it running fine on a GeForce  8600M and on a GeForce GTX 670M. No idea 
what Stuart runs.

This may be too much to be asked, but:

* any errors thrown to the console?
* do the artefacts go away if you select different quality values for the 
transition and landmass effects? If yes, at what values does this happen?
* are other effects (urban, water,...) in the Atmospheric Scattering framework 
working correctly?
* do you know when the problem appeared - was it specifically after the Iceland 
commit, or since procedural texturing was introduced in summer?
* are there terrain types which do not show flickering, if so which ones?

* Thorsten
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