Visually, just looks like the base render target content example.
I have been rendering trails via flow map at runtime in the material for over 6 month.
Render target res barely matters. You can use any base shape you want by changing the sprite/vector field you render.
Ms cost for the render at 2k is about .2ms which is next to nothing.
Because it’s driven by niagara you can get complex effects that collapse over time. Or, that are always visible.
There’s almost no cap to how many GPU sprites you can spawn around at least I have yet to hit one over hours of testing.
you can put a footprint down in the snow 80km away, return to it and still find it there…
Anyway, you can probably simplify both the mesh and the materials in that sample to gain some performance. As well as the RT res. No reason it shouldn’t be running at 120fps.