Hi. I am doing "Vostok-1" project for Flight Gear open source flight simulator and have a lot of problems due to current terrain engine what can not supply high altitude/speed flights.

On normal 25km visibility it not shows anything but blue fog

because normal altitude for orbital flight is >100km, but it still loads something and produces great lags.

If visibility is high enough, say 500km, it makes more or less cool pictures

but does it one time in minutes.

I suppose what including some other terrain engine, say osgEarth http://osgearth.org/ and switching on it from some speed/altitude could solve all that problems. But me myself do not competent enough to implement it and I had not find needed interest from FG community.

I could do something in that case still but need a lot of help. It would be better if someone else would do it because I have a lot of problems to solve in "Vostok" and have a plans for next projects already.

Can You help me?

Other option to include "Vostok" in other open source space simulator, I do not want to use Orbiter or other closed source software in that means. Maybe You can name that simulator then?

"Vostok-1" Flight Gear forum topic http://www.flightgear.org/forums/viewtopic.php?f=4&t=11687

New terrain engine Flight Gear forum topic http://www.flightgear.org/forums/viewtopic.php?f=6&t=12005