Context: this report comes from a RenderFuzz-based UE 5.5 rendering anomaly study. I am posting the issue publicly so other Unreal Engine developers can check whether it is reproducible, already known, or has a practical workaround.
I know some shimmer is expected from extreme high-frequency materials, but I am
seeing a stronger artifact in UE 5.5: the stripe material shimmers and nearby
reflective/glossy content also flickers.
Repro setup:
- UE 5.5 on Windows.
- High-frequency black/white stripe material.
- TAA or TSR enabled.
- Screen percentage in the captured cases includes values such as 50, 67, and
75. - Slowly translate or rotate the camera while the striped material and nearby
reflective object are visible.
Observed result:
The stripe pattern shimmers/moire-flickers. In the stronger captures, nearby
reflective or glossy surfaces flicker too, so the instability is not confined to
the material itself.
Expected result:
The temporal AA result should be as stable as possible, and reflected/glossy
neighbors should not abruptly flicker due to nearby high-frequency material.
Evidence:
- Attach
evidence_sheets\10_高频纹理导致周围可反射物体出现闪烁.jpg. - Attach
evidence_sheets\09_高频纹理抗锯齿效果不及预期.jpg. - Attach the material setup and screen percentage.
Question:
Is there a recommended way to stabilize this beyond texture mip/UV changes? Has
anyone seen high-frequency material instability propagate into reflections?
I also submitted this through the Unreal Engine Bug Submission Form and am using this thread to keep a public reproduction record.
Attachment note: I attempted to attach video_comparison.mp4 here, but this forum account is currently blocked by the forum’s new-user attachment restriction. The representative video was attached to the Unreal Engine Bug Submission Form submission and can be provided again when the forum allows attachments.