I have been read source code for a while.Here is some issues that when i using Niagara Particle with Translucency blend mode i found that My Character s Groom Hair always in front of my particles.It seems that Groom Hair render after the Translucency.But the Groom Hair is Opaque as i though Until i read the source that Hair must composite in Post Process.Is there someone know why this Opaque Object must Composite in PostProcess?Because this Architecture are affect the Opaque and Translucency Sorting.I dont know why unreal engine must Put this here.