GPU Particles will always have a lifetime of one second when using a collision module. This is a result of an issue with how off screen timing is handled. GPU particles that are off screen should only have a lifetime of one second when collision is enables, but this applies to particles that are on the screen.

There is a fix is in Dev-Niagara, but not in 4.22.

Steps to Reproduce
  1. Create a new emitter
  2. Set the sim target to GPU Sim
  3. Add a collision module under Particle Update
  4. Create a system with that emitter
  5. Add the system to the level

The particles will only last for one second, regardless of their actual lifetime.

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-74097 in the post.

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ComponentRendering - Niagara
Affects Versions4.22
Target Fix4.22.2
Fix Commit6405395
CreatedMay 2, 2019
ResolvedMay 9, 2019
UpdatedMay 14, 2019