How to enable Chaos

[THEAETIK]

So basically, from what I understand now, it's 4.23 t'ill it is done.
Chaos Beta = 4.23.

You can enable Chaos in 4.24, but you really shouldn't. 4.25 is probably the same story.

[jkinz3]

There are currently outstanding features in the Beta versions of Chaos. Once out of Beta you'll be able to convert your project to Chaos and have what used to utilize PhysX working.

We have not announced a release date yet, but we're getting closer!

The 4.25 preview notes didn't mention chaos at all. I'm sure 4.25 will include tons of chaos work but were there any changes in the preview build?

[VictorLerp]

Not sure if it's because I built 4.24 with Chaos. But almost anything physics related from my 4.23 project doesn't work when I copied it over, not just chaos:

• Cloth physics no longer simulating
• Pawn Class Hoverbike using physics simulation
• Character Class sliding on, or passing through meshes that have been scaled
• Editor constantly crashing on Stop / Play
• All chaos objects fracturing OnPlay and passing through collisions

Also Victor, I looked around but is there a planned date for when Chaos will be integrated in UE4 from the launcher?

Thanks.

There are currently outstanding features in the Beta versions of Chaos. Once out of Beta you'll be able to convert your project to Chaos and have what used to utilize PhysX working.

We have not announced a release date yet, but we're getting closer!

[THEAETIK]

Yes, Chaos Demo is totally broken in 4.24.

Not sure if it's because I built 4.24 with Chaos. But almost anything physics related from my 4.23 project doesn't work when I copied it over, not just chaos:

• Cloth physics no longer simulating
• Pawn Class Hoverbike using physics simulation
• Character Class sliding on, or passing through meshes that have been scaled
• Editor constantly crashing on Stop / Play
• All chaos objects fracturing OnPlay and passing through collisions

Also Victor, I looked around but is there a planned date for when Chaos will be integrated in UE4 from the launcher?

Thanks.

[VictorLerp]

We're aware of some issues with Chaos in 4.24. Thanks for being on the cutting-edge and helping us out during the beta!

[Moth Doctor]

I followed the instructions and downloaded the chaos demo project and built it with a fresh copy of the release branch on github. However, none of the buttons in the startup map do anything and one button on the end crashes the editor. Anyone know what's going on?

Yes, Chaos Demo is totally broken in 4.24.

[jkinz3]

I followed the instructions and downloaded the chaos demo project and built it with a fresh copy of the release branch on github. However, none of the buttons in the startup map do anything and one button on the end crashes the editor. Anyone know what's going on?

[VictorLerp]

scha Chaos will have full parity (and more) with existing Physics in UE. The simulation component is temporary, and physics constraints etc will work as you'd expect.

[scha]

"Normal" physics won't work once Chaos is enabled. Jack Oakman shows how to use the current implementation to simulate static meshes on the livestream: YouTube link with timestamp

Hi Victor,
Thank you for the info. So the trick is to add static mesh simulation component to every static mesh actor you want to simulate, right? Will that be the same when Chaos is released as replacement for Physix? Or it's a temporary workaround?

Will that make physics constraints actors work too?

Thank you.

[VictorLerp]

Does chaos build works for normal physics too, or it's just for destruction?

I've just compiled 4.24 with chaos following instructions from the documentation (modifying build.cs and enabling plugins), but when I try to use simple cube with physics enabled, it will not work correctly. Instead just falling on the ground it will either go through or turn in the air or stuck in some bizarre position. Also, physics constraints do nothing.

"Normal" physics won't work once Chaos is enabled. Jack Oakman shows how to use the current implementation to simulate static meshes on the livestream: YouTube link with timestamp

[kurylo3d]

So when is chaos out of beta so we dont have to go through this massive headache?

[jkinz3]

I'm having a lot of trouble with chaos in package builds. When I create a package build, the chaos objects don't do anything. They don't fall down or break or anything.

The log has a bunch of lines like this

[2020.02.05-18.15.18:600][ 0]LogStreaming: Warning: FAsyncPackage::LoadImports for /Game/ChaosTests/Blueprints/GeometryCollectionParent_Blueprint: Skipping import GeometryCollectionDebugDrawComponent /Script/GeometryCollectionEngine.Default__GeometryCollectionActor:GeometryCollectionDrawComponent0, depends on missing native class
[2020.02.05-18.15.19:166][ 0]LogStreaming: Warning: FAsyncPackage::LoadImports for /Game/ChaosTests/Blueprints/BP_SkeletonWarlordCrumble_GeometryCollection_Blueprint: Skipping import GeometryCollectionDebugDrawComponent /Script/GeometryCollectionEngine.Default__GeometryCollectionActor:GeometryCollectionDrawComponent0, depends on missing native class
[2020.02.05-18.15.19:166][ 0]LogStreaming: Warning: FAsyncPackage::LoadImports for /Game/ChaosTests/Blueprints/BP_SkeletonFootmanCrumble_GeometryCollection_Blueprint: Skipping import GeometryCollectionDebugDrawComponent /Script/GeometryCollectionEngine.Default__GeometryCollectionActor:GeometryCollectionDrawComponent0, depends on missing native class
[2020.02.05-18.15.19:166][ 0]LogStreaming: Warning: FAsyncPackage::LoadImports for /Game/ChaosTests/Blueprints/BP_SkeletonFootman2Crumble_GeometryCollection_Blueprint: Skipping import GeometryCollectionDebugDrawComponent /Script/GeometryCollectionEngine.Default__GeometryCollectionActor:GeometryCollectionDrawComponent0, depends on missing native class
[2020.02.05-18.15.19:168][ 0]LogStreaming: Warning: FAsyncPackage::LoadImports for /Game/ChaosTests/Blueprints/BP_SkeletonArcherCrumble_GeometryCollection_Blueprint: Skipping import GeometryCollectionDebugDrawComponent /Script/GeometryCollectionEngine.Default__GeometryCollectionActor:GeometryCollectionDrawComponent0, depends on missing native class
[2020.02.05-18.15.19:197][ 0]LogStreaming: Warning: FAsyncPackage::LoadImports for /Game/ChaosTests/Blueprints/giant_boulder2_GeometryCollection_Blueprint: Skipping import GeometryCollectionDebugDrawComponent /Script/GeometryCollectionEngine.Default__GeometryCollectionActor:GeometryCollectionDrawComponent0, depends on missing native class
BP_SkeletonWarlordCrumble_GeometryCollection_Blueprint.Default__BP_SkeletonWarlordCrumble_GeometryCollection_Blueprint_C     (class BP_SkeletonWarlordCrumble_GeometryCollection_Blueprint_C)
[2020.02.05-18.15.21:219][  0]LogStreaming: Error:         Dep C_BEFORE_S Import    29   /Script/GeometryCollectionEngine.Default__GeometryCollectionActor
[2020.02.05-18.15.21:219][  0]LogStreaming: Error:         Dep S_BEFORE_C Import    19   /Script/GeometryCollectionEngine.GeometryCollectionDebugDrawComponent
[2020.02.05-18.15.21:219][  0]LogStreaming: Error:         Dep S_BEFORE_C Import    31   /Script/

[scha]

Does chaos build works for normal physics too, or it's just for destruction?

I've just compiled 4.24 with chaos following instructions from the documentation (modifying build.cs and enabling plugins), but when I try to use simple cube with physics enabled, it will not work correctly. Instead just falling on the ground it will either go through or turn in the air or stuck in some bizarre position. Also, physics constraints do nothing.

[V0xFire]

Updated to 4.24 source build. I'm using latest VS2019 (16.4.4)
I changed the UE4Editor.Target.cs for 4.24 to include bCompileChaos, bUseChaos.
Built engine & project and made sure all plugins were enabled. In the demo, none of the buttons work but when I step on the very last button, I see the Chaos box fracture for a second but the frames drop to 0 and I have to force close. Any idea what causes this? Don't think it's my system but could be. Quick specs: AMD 8150 w/ Sabertooth 990FX, 32gb RAM, RTX 2060

Also does Chaos support Cut-out Fracturing? Should I continue to stick with 4.20 Blast & Apex for now? Thanks!

Lavanaut

We encountered issues with the 4.24 version of source build and chaos, you can use 4.23 which works nicely.

I doubt its your system with the specs you have, but you never know

By cut out fracturing im assuming you mean you want to cut out bullet holes from a mesh, this can defo be achieved using the fracturing tools as i have managed it, it depends on how you fracture ofc, bare in mind if you are looking to release really soon this isn't yet production ready but will hopefully be within the year

Sam

[Lavanaut]

Updated to 4.24 source build. I'm using latest VS2019 (16.4.4)
I changed the UE4Editor.Target.cs for 4.24 to include bCompileChaos, bUseChaos.
Built engine & project and made sure all plugins were enabled. In the demo, none of the buttons work but when I step on the very last button, I see the Chaos box fracture for a second but the frames drop to 0 and I have to force close. Any idea what causes this? Don't think it's my system but could be. Quick specs: AMD 8150 w/ Sabertooth 990FX, 32gb RAM, RTX 2060

Also does Chaos support Cut-out Fracturing? Should I continue to stick with 4.20 Blast & Apex for now? Thanks!