I have two issues while I am flying in the clouds,
The cloud configuration is the same,
Using UFO aircraft to make the test,
FLIGHT GEAR 2017.1.2
Basic Weather, Manual Cloud Configuration,
Using one Layer, Cloud Base 1000, overcast, thickness 6000
1) Local time 12:00
We can get in the cloud,
The transition from 900 ft. to 1050 ft. is good, we saw the cloud base and we get in the cloud
But while we are in the cloud, 2000 ft. for example, we can see or identify the horizon line after some seconds, although we only see gray outside, the half upper screen is a little bit
dark gray than the half lower. We should turn off the room lights to see it clearly.
If make a turn you can know your attitude by looking on the horizon line,
I use Flight Gear to teach IFR procedures to my students and while they are in the cloud, they can know their attitude by looking out of the window.
I noticed it on FG 3.0 and I upgrade my FG to 2017.1.2 and we have the same result
2) Local time 00:00
With the same cloud configuration, while we are in the cloud, 2000 ft. for example. I can see the stars,
if I make a turn the stars moves.
If I go to 800 ft. I'm below cloud base, I do not see the stars, as soon as I climb to 2000 ft. and I get in the clouds, I see the stars.