Particle - Local space multiplies world location offset

Development Asset Creation FX
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1

Very hard to explain, lets add an image first:

This flame that isnt close to the cursor is set to local space, its innitial location is set to 10/0/0 and thats it.
there is no relative location, no world location, no pivot location stuff nothing.
All I did was duplicate a gpu particle emitter.

Aaand… just when I want to show the problem inside cascade, I changed the emitter name and the problem is gone.
Guess… itll be a mystery untill it happens.

2

[UE4] - Particle local space bug. - YouTube < video of the problem.

apparently setting one gpu particle to local space results in another gpu particle its location to offset really oddly.

Since this is for a marketplace thing I cant just link the file, and will wait for an epic employee to ask me to pm them on i.e. the forums.

3

Hi Luos -

That is a weird one. Just so we can talk on a the same page without restricted assets. I setup a rough example project, where I have attempted to reproduce your results but am not seeing the same as you are. I am probably missing a toggle or checkbox. Have a look at the project and upload with additional information when you can.

Eric Ketchum

Test Project 4.9.2

4

ok, rather easy.

  1. Set both Fire_Out’s to "“Kill on deactivate” & “Kill on Completed”
  2. Now duplicate the 2nd “Fire_Out” (Duplicate and share)
  3. change the “Required” from the newly created “Fire_Out” so its no longer shared.
    (I just ctrl + dragged the required from the previous “Fire_Out” onto it)
  4. Set the required setting of the new “Fire_Out” to Local space.
    5 ???
  5. Profit (or in this case, a bug)

Just in case: GPU particle bug (v.2) - YouTube
showing how to activate bug with your project.

This is the 3rd particle pack im working on that hits a bug-related wall.
O_o

Edit: If I just duplicate the gpu particle without sharing it… the bug doesnt occur. (afaik)

5

Hi Luos -

Apparently I forgot that I had already entered a bug report for this issue. GPU Particles are not likeing the Duplicate and Share stuff, I think their selfish. I updated the bug with your new information and the reproduction you gave me above as well as attached the project for easy reproduction. It is entered as UE-11795 for reference.

Thank You

Eric Ketchum

6

Just got this problem in ue4 23.

Local space is off in my case however, and still all the particles have multiplied positions, also when I try to change them to local space the switch wont work, as in the check box wont check. ??? Is this a glitch?