OK, I lied. I DID record the 1000m high, low-level, dense cloud layer.
From the field, everything looks pretty good …
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As I started to climb, everything looked good, but the visibility was really bad …
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Then I started noticing the "border", just under the cloud layer, in all directions …
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Note: the border looks worse in-game, because it doesn't seem as distant as the screen shots would have you believe.
Coming back down to the airfield, the border is no longer visible, but I had already gotten lost in that short flight …
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Keep in mind, that mission was without fog, but at 1000m, the dense clouds create a sort of fog effect.
Using low-level, dense clouds at 1500m gives much better results …
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I suppose you could say there is a distant-looking border just above the horizon, but it looks much better and more realistic at 1500m.
The only problems I found with the 1500m cloud layer is when I was above them, looking down (and it was only in a couple areas at certain intervals) …
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It's as if some clouds were cropped-off at the bottom. I would definitely recommend people only use the dense clouds at 1500m and above … based on my experience with them.