Weird grid overlay on 3D

[DorelXH]

Godot Version

4.5

Question

I started a new 3D project and a strange pixel-grid / checker-pattern overlay appeared on the screen during gameplay.

It looks like there’s a low resolution texture projected over the entire viewport, almost like a Control node with a pixelated texture on top of the game.

The pattern is always the same size on screen and becomes very noticeable when the camera moves, sharp edges “swim” or warp as if the image is being sampled through a grid.

it does not look like blur, ghosting, or TAA. It happens even when all AA is disabled.

I put a few screenshots below that try to show this. Its really mostly visible when the camera is moving.
Has anyone seen this before or know what causes this? Thanks.

[rpahut]

Is this a kind of Rorschach test?

I am pretty certain no one here knows what causes this for you, how can we. Can come up with any number of speculative reasons, like you using a crippled shader for example - is that not a possibility? You might want to elaborate on how you have your project and scene set up.

[hexgrid]

Are you perhaps rendering to a low-res viewport and scaling it up?