Currently, FlightGear (SimGear, actually) always sets visibility to near-nil when the plane is inside a cloud layer -- obviously, the right and proper solution is 3D clouds, but until we have that working, or at least until we can detect whether the plane is actually near the cloudy part of a texture, I suggest that we do not limit the visibility when the cloud coverage is under 50% (i.e. scattered, few, or clear).
This is due to a faulty SGSky::modify_vis() function. Actually it has been broken since early 0.7.x as I recall it. I've never remembered to look at it prior to a release, but I would recommend to fix that function rather than to apply any kind of hack.
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