Bug UI does not have motion vectors for TAA

UI does not have motion vectors for TAA

 

Sorry for so little details. Yes, we have UI in moving vehicles, and we are using TAA.

Any input on this issue is appreciated.

 

Hi, just encountered this in the new cinematic template for HDRP in unity hub 3.0 for 2021.2.2.
In the end of the animation, there's an animated credit UI/UGUI. It's quite hard to read with TAA as it doesn't seem to provide motion vectors based on motion vector debugger.

With TAA:


Without TAA (using FXAA):


UI:

 

oh, nice to see the Mich-L demo getting some TLC and a default template.

if I recall Screen spaced render targets for UI works with TAA, but world Space UI has the same motion issues mentioned above.

 

Really interested about this one as well

 

force _stencilref to 0 is my current solution

 

Hello. I currently have a world space UI in VR, and the UI is very blurry in HDRP with DLSS (which I rely on) or TAA (for older GPUs). Also when I put my fingers through the buttons it distorts the ui with the motion vectors from the fingers making it appear a bit like warping water surface. I can imagine some worse artifacts when there are fast moving objects behind the UI.

In VR UI every pixel counts, so not having those artifacts and improving clarity would mean a lot.

So just want to give my feedback and let you know that at least for people with similar projects it is a needed feature.

 

I think you should use msaa for VR always... and increase resolution

if you have to stick to taa (really bad for vr in my opinion)
you may try:
after posteffect or customPass + override depth with after posteffect

and

Ask your programmer to :
change stencilRef to notaa
and fix the HDRP jitter bug according to :https://github.com/Unity-Technologies/Graphics/commit/0d9cb812c9dc8f13d13e117217eb37d55bc2759f

 

This was exactly the behavior I was getting on screen space camera UI. I'll try this suggestion as well.

 

I have to use HDRP, I'll take blur over flicker and aliasing. So there is no MSAA in defered. And SMAA has too many artifacts and I might need DLSS anyway for performance.

This won't help. There is no artificial jitter on the VR camera, it's natural tracking jitter.

I have NGUI, I might give that a go. It supports normal PBR materials and will behave like other materials in the scene. The link you gave me made me think about the fact that UI is not getting the post processing and that is not the behaviour I want. I'd want it to be more grounded in the world and maybe even getting some lighting anyway.

 

Oh god this is still a thing

Canvas renderer just doesn't output motion vectors when used on world space uGUI objects no matter what shader I use ("HDRP/Unlit" for example).

This is not a problem if your UI elements are static. But as soon as any of them move... oh boy.
Same problem with TextMeshPro UGUI component.

 

Nice! Thanks for intel.

This will possibly be useful for our next project then, since the current project is way too big to migrate from Unity 2021 to 6.

No chance of backporting this to 2022?

 

We did a temp fix which works really well, use a unlit transparent shadergraph and plug in the font atlas in alpha (see ref. image). Then enable transparent write motions vectors on corresponding materla. Use this material in your text mesh pro component. Don't know if this suit your case, but if so - fantastic!