Hi There !
it's more an observation than a real problem as I found a "work around" but i'm curious about it. I Found out (but maybe it's local problem ? ) that there is a weird behavior while rendering xpTrails directly with Arnold through an Arnold Tag.
If the xpTrails/spline are set as Linear type with Adaptative interpolation (in the spline Tab of xpTrails), everything render fine, but as soon as I switch to something else, let's say Akima and Natural interpolation, trails are calculated and displayed correctly in the viewport by Xparticles, but Arnold "miss" a lot of them when rendering (nearly half of them).
is it normal/known behaviour of C4DtoA ?
