UE 4.23.1 - Chaos & Geometry Collection - Divers Problems

Development World Creation
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Hi there,

Our team have come across some problems when creating and editing geometry collections, maybe someone can help us or just tell us that these things are known as bugged and will be worked on in the future.

1.) Box Collision:
When creating a Geometry Collection, it seems that the box collision is bugged.
The bounding box is way off and weirdly rotatet.
Here are some screenshots of some custom testing meshes and basic unreal cubes:
(The seems to be the case for the assets in the Chaos Demo project)

GCBOX1.PNG.jpg
GCBOX1.PNG.jpg700×551 64 KB

2.) Fracturing Preview:
As it seems the preview of the fracturing tool actually shows a completely different geometry than what you’ll end up with.
For us it was always the case, here is an example of what we mean:

fracture_preview.jpg
fracture_preview.jpg1113×681 88.2 KB

3.) Unfracture:
Just wanted to ask if there such a feature and we just don’t see it. It can be quite time consuming fracturering stuff with a wrong preview and then ending up with an unwanted result so you have to delete the whole thing and start from scratch. An unfracture button would be great, if possible.

4.) (edit) Landscape Collision:
Is there a way to let geometry collections react/collide with the landscape at the moment or will this be something for the future?

Thanks in advance :slight_smile:
Cheers

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(post deleted by author)

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Not sure it helps, remove chaos, go back to physx which actually works - particularly in .23 - and create your own class for geometry collections that does what you need it to.
Its essentially just a mesh swap system - from one mesh to many mesh pieces that are pre-fractured/baked.

Then, you fracture your assets in a DCC and import the fractured parts. Making the process entierly out of engine ensures things (like UVs and mesh caps) work right.

The fracture tool may have gotten slightly updated in later versions, but the chaos performance got worse and worse up to an 80% performance loss compared to physx in 4.27.