Particles vs TAA

Hi,
I was checking the hdrp out, tried the hdrp template and in the second room there is bamboo, falling leaves and butterflies. Butterflies are ghosting, vanishing and smearing themselves over the vegetation with temporal aa, fine with other AA. After some digging I found some options in vfx graph. Exclude from TAA looks like it does nothing. Generate motion vector improves artifacts a lot but is not good enough. Any way to fix it other than switching AA?

 

Also important to enable transparent motion vectors (in HDRP settings and on materials), but even with this enabled there are issues - especially with transparent on top of transparent objects...

 

Yup, transparent on transparent is ghosting. After some more tweaking Generate motion vectors on, TAA Anti-flickering at 0 and TAA Speed rejection at 0 is.. passable, butterflies look like butterflies, but SMAA on particles looks better.

 

I am hoping DLSS will solve a lot of AA issues