Chaoos cluster crumble causes flickering

Development Asset Creation
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1

Hi,

I’ve been testing out the Cluster crumbling feature. While it’s an awesome feature it causes a visual bug that stand out quite a bit.

Once the cluster crumbles you can see the parent disappear for a frame before the child pieces reappear. This causes a flickering/popping visual issue.

(I’ve added an example as a video, it might not be noticeable right away but once you see it, it’s hard to unsee it)

I’ve set up my cluster crumbling through the fracture editor. I added a random post break timer so my pieces would crumble randomly after they have been broken.

I noticed when the cluster crumble is called from blueprint that this issue doesn’t appear. I used Crumble active clusters in bp on a break event and these don’t flicker at all.

I explored setting it up this way, but I prefer to use the fracture editor instead. The random timer adds a lot more visual quaiity and being able to set it up from the dataflow editor speeds up our workflow.

Many thanks,

Niels

2

Steps to Reproduce

  • Create a geometry collection
  • Fracture it into two levels
  • Set removal on the first level with Cluster crumbling turned on. ( I set up psot break timer to 1.0 and 2.5)
  • Add a masterfield to break apart the GC into it’s first level
  • After 1 to 2.5 seconds see clusters start to crumble
  • Once they crumble they disappear for a second before the children pieces appear causing flickering
3

Hello [mention removed]​

Thank you for reaching out and for bringing this issue to our attention.

I was able to replicate the behavior following your instructions.

I’ll investigate some more and get back to you.

All the best,

[mention removed]​

4

Hello [mention removed]​

Thank you again for reaching out and reporting this issue.

I’ve made a JIRA report to be added to the Unreal issue tracker website (https://issues.unrealengine.com).

Epic will decide if the issue will be made publicly accessible, and the whole process can take a few days, so keep that in mind.

If/once it is made publicly available, you will be able to track the resolution by checking this link:

I’ll close the case, but feel free to reply if you have anything else to add.

All the best,

[mention removed]​