@mrboni Hello!
Yes this is because it looks like you have some small radius planet (by default the settings are optimsied for ground views).
So for tiny planets, you likely want to increase both r.SkyAtmosphere.FastSkyLUT.SampleCountMax (used by thje fast sky lut when inside the atmosphere) and r.SkyAtmosphere.SampleCountMax (used by the raymarcher when outside the atmosphere).
Have look at https://docs.unrealengine.com/en-US/…nce/index.html. You might also want to tweak cvars with DistanceToSampleCountMax for both of this cases too for your specific case.
In 4.26, there will be a *ray marching quality scale *(clamp to config quality settings) on the SkyAtmosphere component itself to try and avoid having to deal with CVARs as much as possible.
Also, if the aerial perspective is not showing up on your mesh, you need to increase r.SkyAtmosphere.AerialPerspectiveLUT.Depth. It should be all in the reference document.