I then made a much bigger plane that wasn’t a grid, simple plane UV unwrap but it is 719708m in width/length to be an ocean, the jitter happened even worse on that and this was using the albedo map offset this time without normals
by user 103054507105067008
I wonder if it is this https://speckle.systems/blog/speckles-take-on-spatial-jitter-2/
by user 103054507105067008
I’ve made another repro here as I’m really scratching my head at this, trying out doing a UV animation like in this post to see if that fixes it but I can’t seem to animate normal maps in exported animations using URP/Lit - Offset in an animation
https://discord.com/channels/717429793926283276/1060281287765671976
by user 103054507105067008
From that repro project - one plane, one script on it and the Normals have some weird jittering across them as can be seen here
by user 103054507105067008
How large is that object?
8000m x 8000m
by user 103054507105067008
I resolved the jitter by setting the scale of all objects to 1,1,1 and the tiling of all materials involved to 1,1 but the this.context.time.deltaTime is skipping when I simply use that to move the offset in that sample project
by user 103054507105067008
That’s large!
I can send over a smaller example but it happens with even a 100x100 plane using the same URP lit material
by user 103054507105067008
Hold fire on checking the samples out for this, I really think this is just a floating point accuracy issue with meshes larger than like 3000-4000 metres or if the material or UV set is tiling too much. Will feed back if I have any more findings tomorrow
by user 103054507105067008
To prevent extra jitter, I clamped the UV scroll this.mainMaterial.normalMap.offset.y = (this.mainMaterial.normalMap.offset.y + (this.context.time.deltaTime.toPrecision(5) * this.speed)) % 1.0;
And use a model that is less than 3000m wide I don’t see the jitter so much so it’s probably a combo of UV + object scale accuracy + the offset value being outside of 0-1 accuracy also
by user 103054507105067008