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Velocity and EmitterTime from particle collision report random values

If you add a particle emitter, and add an Event Generator - Collision and Actor Collision

Binding an event to that Particle Emitter "OnParticleCollide" will report very random values for Emitter Time, somtimes rising values with each collision, and sometimes falling values.

Velocity will report 0,0,0 always, until the max number of collisions has been reached.

Let me know if this needs a repro project, and i'll set it up for you.

Product Version: UE 4.18
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asked Oct 13 '17 at 09:49 PM in Bug Reports

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Jonas_Molgaard
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avatar image Jon X ♦♦ STAFF Oct 16 '17 at 03:45 PM

Hi Jonas_Molgaard,

I'm having trouble reproducing this issue on my end. Are you able to provide some more specific repro steps or a repro project so that we can look in to this issue?

avatar image Jonas_Molgaard Oct 20 '17 at 11:24 AM

Here you go. It prints out the velocity on collisions. You will see zero's for the first 4 events and then something for the final collision. Try also add debug print for the Duration, and you will see strange values

https://www.dropbox.com/s/638gzbv7ct9leed/MyParticleCol.zip?dl=0

Also observe that sometimes the casing fall through the ground.

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2 answers: sort voted first

Hi,

Thanks for providing that project, I can see what you mean and I have logged JIRA UE-51529.

Our developers will be investigating the issue further. Please follow that link to monitor the status of the report.

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answered Oct 23 '17 at 05:51 PM

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Jon X ♦♦ STAFF
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Hi @Jon X, i followed your link, and noticed that it's marked as "Won't fix", which i can sort of accept, but is there any chance of an explanation for this? And what workarounds to use instead then?

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answered Oct 27 '17 at 11:28 AM

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Jonas_Molgaard
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avatar image Jon X ♦♦ STAFF Oct 27 '17 at 02:05 PM

With the recent release of engine version 4.18 our developers are focused on high priority crashes and blockers. Regarding a workaround, I will continue to investigate and post here if I find anything useful.

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