Are you using Developer Mode or made changes in it?
No.
Have you disabled/removed all your mods and add-ons? If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move your report to the third-party forum.
Yes - the issue still occurs with an empty Community folder and all add-ons disabled.
Are you using DLSS?
No - TAA.
Brief description of the issue:
Since Sim Update 5.1 (1.7.35.0) a sharp, perfectly straight horizontal line is visible at the horizon during cruise. It looks like the edge of a terrain/world tile, or a seam between the terrain/atmosphere and the haze layer - the sky and haze gradient is visibly cut in two along that line, with slightly different brightness and colour above and below it.
The line:
• appears at higher altitudes, most obvious around FL300-FL380,
• is visible both over water and above overcast cloud layers,
• stays locked to the horizon and moves with the camera, so it is clearly a rendering artefact and not a cloud or weather feature,
• is visible in the external view as well as from the cockpit, so it is not aircraft or windshield related,
• becomes more obvious when zooming in slightly.
I did not see this before SU5.1, and it is still present after updating to Sim Update 6 (1.8.14.0), despite the LOD transition and distant rendering fixes included in that update. My hardware and graphics settings have not changed across any of these builds.
Important: I am NOT using REX Atmos or any other weather, sky, atmosphere or post-process add-on. This happens with completely stock atmosphere and weather and with an empty Community folder, so it is not the known REX-related horizon artefact.
Detailed steps to reproduce the issue encountered:
- Start a flight with any airliner.
- Climb to cruise altitude (FL300-FL380).
- Use Live Weather (also reproduced with preset weather).
- Look towards the horizon, from the cockpit or in external view, and zoom in slightly.
- A hard straight line is visible across the whole horizon, splitting the haze and sky gradient.
PC specs and/or peripheral set up if relevant:
CPU: AMD Ryzen 7 9850X3D
GPU: NVIDIA GeForce RTX 5090, driver 577.xx
RAM: 64 GB
Graphics settings: [Ultra / custom - Terrain LOD, On-screen terrain pre-caching]
Build Version # when you first started experiencing this issue:
1.7.35.0 (Sim Update 5.1). Not present on 1.7.27.0 (SU5). Still present on 1.8.14.0 (Sim Update 6).
Are you on the Steam or Microsoft Store version?
Steam.
