> - no errors on the console
> - latest drivers for the ati card (tested with all ati drivers from 2012
> for win7 64bit)
> - the artifacts show up if the landmass shader is over 3 (counting from
> left / starting with 0)
> - the artefacts show up if the transition shader is over 1 / at 2 only  
> the
> airport grass is showing the artefacts
> - the Atmospheric Scattering seems to work as far i can tell and shows no
> artefacts, water looks good too.
> - did not try change the shaders while using Atmospheric Scattering  
> before
> the iceland commit, only used the default values.
>
> Hope that helps.

Not really. Your card/driver doesn't like *something* of the procedural 
texturing although the shader compiles fine (you don't get the artefacts when 
you're running terrain-haze.vert/frag, you do get them whenever you run 
terrain-haze-detailed.vert/frag).

It may be the overlay textures, it may be that the noise function generates 
values outside the [0..1] range by some weird numerical problem... Does it 
happen for all landclasses (for instance, agriculture doesn't have overlay 
textures or bump-mapping) - so in theory some landclasses would never see 
overlay texture or noise function issues. Does it depend on the values of the 
dust, snow, vegetation or wetness sliders in any way?

Otherwise... if it doesn't throw an error, and if I can't reproduce it and we 
don't see any dependencies, I am a bit at a loss how to debug it. You could 
either see if there's any previous version which runs fine (in which case we 
can debug based on what has changed) or we can try to disable all procedural 
blocks, and then you have to uncomment them one by one and see when the problem 
occurs. Let me know if you're interested in the latter option (but it means you 
have to start editing around in the shader code yourself).

* Thorsten
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