In the Real Solar System mod, rescaled Earth's atmosphere has to be calculated according to the game's standard model, which means that it ends at about 60km unless I decrease mean molecular weight. And even then, it's extremely unrealistic. Changing the atmosphere to end at 110km, I was able to operate a fighter jet at 40km, even though is would have its operational ceiling at half that altitude!
This is how Earth's real atmospheric density curve looks like: https://1.bp.blogspot.com/-EXOZphff7jg/T--U45sQm3I/AAAAAAAAA6k/ksdpdjNwmKI/s1600/Earth%2BP%2Bprofile.bmp
As you can see, it's a roughly hyperbolic curve. The majority of all air is below 10km, and above 25-30km density is negligible but still notable. A spacecraft entering the atmosphere at 100-110km doesn't hit it like a brick wall, but it begins to slowly decelerate, then plasma appears etc...
This is how the Shuttle's altitude-speed profile during reentry looks: https://www.researchgate.net/publication/320598271/figure/fig2/AS:631660437594122@1527610992428/Space-Shuttles-altitude-versus-velocity-for-a-typical-re-entry.png
Please allow us to set a custom density profile for our planets' atmosphere in Planet Studio, whether by setting a number of checkpoints and making the game interpolate between them, or entering a mathematical expression, or just visually defining a curve as in the curve remap tool of the terrain engine.
the visual curve solution could be really easy to do, so yeah i want this