How to make a smooth terraforming hill

I am trying to accomplish something like the bottom picture but when I add
either a rectangle or a polygon and lift it a bit (terraforming) I get this
horrible triangular spikes (top picture). Does anyone know how can it do this?
Am I doing something wrong?



None of the terraforming tools work properly with areas and elevations that
small or narrow, or I haven’t found a way yet. It does seem possible for the
sim’s own terrain but that must be a different system we can’t access. The
only way of doing it with any precision will be a 3d model.

Try create rectangle with 256x256 map, then terraform. The result is certainly
not predictable, but in some cases it allows you to achieve a result. Or make
a DEM mesh. Perhaps this will give the best result.

You May want to consider my answer in this 3d
https://devsupport.flightsimulator.com/t/3348 The current mesh system Is
limited by the resolution of the grid underneath It , you can take see It by
enabling the wireframe settings in the Dev menu. Basically, the grid Is
aligned north-south, so any terraforming aligned to the girld Will give you
straight edges, any rotation Will give you a some jagged edges You can’t avoid
It, it Is the way . You can minimize the effect by adding some falloff (aka
smoothing) . Or you Can Hope in a higher definition grid, eventually they Will
manage to obtain that, dunno It Is mesh related. As per @superspud answer, if
you Need a perfect shape, go for the 3d solution, you can borrow the sat
imagery for your textures and plant some “fake” grass, most users Will not
notice it