Unstable particles at big delta time

Hi

I found an issue in the particle system when the engine delta time comes to big values for example from 0.03 to 0.4.

Observe movie what happening with particles:

I also created a sample project where this issue can be easy reproduced:
  1. start the gameplay
  2. press and hold “Z” key to emit particles
  3. press “E” to destabilise delta
  4. observe the issue, some particles are teleported in the far distance from the character and some particles are reverted back.

This issue is really annoying when You want to create a particle effect which returns events from collisions.

I checked 4.6,4.7 and promoted branch(4.8) and I was able to reproduce this issue with my test project.

If you can’t make repro because you have “NASA computer”:slight_smile: just edit MyCharacter blueprint and increase iteration counter in the for loop connected to “E” key.

Anyone has an idea how to fix this? Or where should I start.

Regards

Pierdek

Hey Pierdek -

Thank you for your report. I have entered a bug report for this issue. As we continue to investigate the issue, I will keep you informed, for reference UE-9630.

Thank You

Eric Ketchum

Hi Eric,

any news about this issue?

Regards

Pierdek

Hi Pierdek -

This issue is currently backlogged but assigned.

Thank You

Eric Ketchum

Hi again, any news about this issue?

Hi Pierdek -

It looks like this issue is still backlogged.

Thank You -

Eric Ketchum