What Vue version are you using? And what sort of fog is this? From the atmopshere editor or maybe a metacloud?

I once had a similar effect when I had a light in a metacloud. Not quite the same but similar.

Vue 5 Infinite. This is the fog from the atmosphere editor.

And it changes when you maybe change the camera? Just a little bit. Could it be a strange sort of sun lens flare maybe?

There's no flare at all on the sun, it does change when the camera is moved. The camera however needs to be moved considerably for the line to go away. This obviously disrupts the desired angle. The line can be masked adding more density fog (not the falloff or altitude) hwever, this is not the amount of fog Clouseau wants. Hmmmmmm.

You could try the following:

Select everything in your objects list to the right - except of the sunlight object. Now that you have all, the camera, the objects, the layers, the ground selected as one, zoom into the side view window and grab the Z axe and pull it upwards a few small steps.  Mark a small render area right including this fog line to make a quick render and check, if the line is still visible.

Repeat this upwards movement in small steps - render again - move a few pixels - render again, until this line hopefully disappears.

Before:
img467.imageshack.us/img467/8316/fogcutlinepic1hj2.jpg

After:
img467.imageshack.us/img467/4008/fogcutlinepic2yh1.jpg

This way you only make short movements and it doesn't affect the angles of lights/shadows and the camera view/angle/position are staying the same relating to your scene, but this strong perfect cut line could disappear.

Not sure either, if this would work with any atmosphere setting or style, but it's worth a try ...

Why Vue is doing that ? No idea - but it could be something, the programmers could take a look into for one of the next updates.

I'm afraid Kilanor that this seems to just effects the altitude of the fog as if I were just moving the altitude slider in the atmosphere editor. The horrible line is still there anyway. Thank you very much for your suggestion, any more?

As far as i have experienced this effect in my image before, moving the fog or haze sliders back and forward, different heights or whatever for the fog, the line never disappeared, only when the fog was totally turned off, logically.
Only with this movement i've described, as odd as it appears, the strong fog line, which bothered me too, vanished - no explanation what should be the difference compared to the slider settings.
But - like i've said, it probably only works on certain settings/atmospheres ...

Well, i hope you'll find a solution for this soon.

Hi Kilanor,

You might want to check out my Fog & Haze tutorial which cover Vue 5 (no spectral atmosphere's yet) .

It recently has been updated encapsulating the Sky tab in the Standard Atmosphere.

Thanks a lot, chippwalters, a very interesting, informative and well done tutorial - for sure great for many other Vue users, too, who are struggling with those settings ...

However, like you've hinted above - for spectral atmospheres it's a very different approach towards fog/haze - it just works very different compared to standard or volumetric atmos ... and in a spectral atmosphere i've got that line problem before, but at least it's rare.

(And if i get problems like that - and there are always spots in my images, that don't turn out the way i want, or leave some bad artifacts - well there is always a little postwork possible, which i use in just about any image, i do ... if it's to take care of some faulty spots, or to add extra details ... or make a bad fog line disappear ;) ).

Sorry Kilanor, I was thinking you were the original author of this thread...who had said he was working in Vue 5. My bad.

While Spectral atmosphere's are great, I've still got a ways to go before I can 'formulatize' them (is that even a word?)

I do know that punching up the Aerial Perspective to somewhere between 20 and 30 really helps create a diminishing horizon and forces a distant haze perspective. For instance:

http://www.renderosity.com/mod/gallery/index.php?image_id=1492090

and

http://www.renderosity.com/mod/gallery/index.php?image_id=1489571

But, I still don't really have an easily explained tutorial figured out for all the rest. There is a lot of dependencies with each setting regarding other settings.

Great images, chippwalters - yes, i've seen them already looking through the Vue gallery before - haze settings  are looking good there - superb Vue renders.

Haze and fog settings in different atmospheres are influenced by another factor, too, which is the overall scale of your scene. For example the same atmosphere and fog/haze settings in a scene with terrain size like in meters are very different looking in a terrain size in km's ... in a spectral atmosphere this is an extra way to get another look and feel in your scene...