I created this example for testing (For now I'm using only the 3d version, no 2d or columbus):
In this example I show the elevation in the toolbar on mouse move.
Anyway, when you are far from the earth, the elevation values become wrong (negative values around -10000 - -20000).
I suppose the problem is that when you have a few poligons to represent whole earth, they cuts the ellipsoid going down the level of the sea of many kilometers.
If this is the problem, increasing the resolution at l0,1,2... can solve the problem, but too many points are required to approximate the whole earth.
I guessed it or the problem is another?
Do you know if there is a way to get a consistent elevation even when the camera is far from the earth?
Thank you in advance for your time.