With particle flow I scattered a few black and white tree pictures to create a forest.
But a strange bug appears as the density increases.
At a 100 density it's ok.
At 600 the farest trees disapear in the alpha revealing a black area (see JPG).
I seems that the planes are too close to compute the alpha (?).
Is there some parameters I miss ?
(it's the same with Direct, path tracing or PMC)
Thanks, Fabrice.