I am using Niagara and Vertex Animation to create corwd simulation, something like this https://www.youtube.com/watch?v=wsUhSxHi6wk
Everything works fine including render with Path tracer. When I finished the simulaiton and set the partcile to read Niagara cache in Sequencer, the crowd dispear in Path tracer. I tried many times and found it can only render without Niagara cache, this issue only happen in Path tarcer, not in Lumen.
I also found if I switch Niagra to CPU sim, it can solve the problem as well, but I used neighbor grid and distance field to detect collision, I have to stay in GPU sim. I am using Unreal 5.3, Is anyone has the same problem with me? Thanks.
I had a same problem UE5.4. I used niagara cache to simple particle, but when I renderd the scene it just disappear same as you.