I tried both and the better is to add only a few points because P3D smooth itself the profile.Altitude wise; does it smooth between points? or do you need to define a lot of points to get a smooth result?
I tried for the first time on sloped airport to build some GP marking's. The apron on which I draw GP is below the official airport altitude.
Unfortunately the GP marks are shown around 1 meter above the apron in v5.
I wonder what is the current rule to expect with GP on sloped airport: Is the official altitude is retained, or is it possible to set a specific altitude?
I tried to set an offset on GP's but negative values are not allowed.
That's correct, however it would be useful when we build GP over apron which are also flat and horizontal.Such a change would only work it all vertices in the GP were at the same elevation and the area bounded by the vertices were absolutely flat. That seems rather unlikely on an airfield with sloping runways. Indeed, since you seem to be placing a GP over a sloping runway, how would such a change help you. The GP would still b e horizontal.
Yes, I should have realized that, but I failed to appreciate I was dealing with two users with different issues, one with runways, one with aprons.but that's the issue I have currently, GP floats 1 meter over the apron.