I’m working on a UE 5.7 post-process shader for a PS1-style look. The shader only performs simple color quantization using:
floor(Color * Levels) / Levels
The problem is that lighting transitions flicker heavily, even when the camera is completely static. The flickering only appears around color boundaries where the lighting changes from one quantized color to another.
I’ve already tested:
No TAA (AA disabled completely)
No Lumen
Different Blendable Locations
Unlit materials
No LUTs
No dithering
The issue is still visible even with a very simple quantization setup. As shown in the video, the lighting gradients themselves seem unstable, and the color quantization makes this instability very noticeable.
Is there a way to stabilize lighting values before quantization, or is there a better approach to achieve hard PS1-style color bands without this flickering?
**Video:**https://youtu.be/_E0XILysWJw