Temporal AA Dithering

Is there a way to do Temporal AA dithering in HDRP with shadergraph?
Not sure if i missed it or not, but it seems i can't fetch TAA_Jitter value from shadergraph, or is shader properties even exist in HDRP? maybe with other name.

 

Hi! Did you manage to find a way to access TAA_Jitter inside shadergraph or hlsl?

 

Sadly no. i guess it's just doesn't exist in shadergraph.

 

Oh! I manage to find it. It actually exists in ShaderVariablesGlobal.cs (and hlsl version of it - ShaderVariablesGlobal.cs.hlsl). So what you are looking for is

Code (CSharp):

1. // TAA Frame Index ranges from 0 to 7.
2.         public Vector4 _TaaFrameInfo;               // { taaSharpenStrength, unused, taaFrameIndex, taaEnabled ? 1 : 0 }
3.  
4.         // Current jitter strength (0 if TAA is disabled)
5.         public Vector4 _TaaJitterStrength;          // { x, y, x/width, y/height }

I used custom function node to access it. It works without any additional includes but rider does not know about it but it works =)

 

Oh it called _TaaFrameInfo?. Nice find man. . .
any chance to share the Custom Function code?

 

Here is subgraph that I created for exposing those parameters

 

That's how it looks like

 

@Camarent Superb, Thanks a lot!!!!
I'll try it out

 

I had found it too. But after that, I met the error " undeclared identifier '_TaaFrameInfo' ". how did you solve it?

 

I found that there is no error in the inspector window, though there are several errors in the graph. But it eventually works.

 

How do I use the subgraph to implement temporal dithering?

 

I understand that I need to move the dither pattern around in order to affect the average temporal sampled pixel, but I can't figure it out.