I found out what the problem was, I’ll share it, in case anyone needs it. There were many debug moments, but they did not give results. The following worked:
First, I reset the Niagara location to 0.0.0 - then everything started working. But it only worked within 200 unreal units (very little distance). As soon as they went beyond certain boundaries, the collision stopped working again. It was strange, because the specially visualized grid showed a fairly large distance.
Secondly, I had to increase the grid size from 1000 to 10000, and then Niagara began to work at a great distance from 0.
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