not showing particles in ray taycing mode

hi everyone.I am try to using fire particle(in starter content and niagara and …) in my project but the fire doesnt show until the post process translucency mode is on ray traycing.when i change it to Raster the particle shows.how can I have fire particle and ray traycing mode(in post process) together?

Hey there @monasn70! Welcome to the community! From what I could gather it’s due to a limitation of the Raytracing implementation that particles transparency isn’t 100% supported, so using Raster in your post process volume is necessary to maintain it. This is due to the way particles don’t exactly work the same way other actors do.

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thanks for your answer