How to enable Chaos

[frostic]

Having read this entire forum history, read the wiki, and watched the following video: https://www.youtube.com/watch?v=hx9dHgcN0bE I still have problems.

A geometry collection set as dynamic immediately explodes (tried with a collection of meshes).
- Changing the value of the floor does nothing.
- Switching the chaos physics thread to something besides task view causes dynamic meshes to no longer move at all.

Any insight on these issues? 4.24.3. VS2019.

First issue is 2019. its not fully supported yet and is a bad choice since no consoles even support it except windows and linux and mac.
4.24.3 is not a good choice either. 4.25.3 would be the best route as chaos has alot of fixes in this version.

use my guide. there only seems to be 1 branch working and that is shown in my guide.

https://forums.unrealengine.com/unre...34#post1780034

[frostic]

Dunno why everybody here fears VS 2019. I compiled the newest 4.25 plus branch with 2019 and it works, they probably fixed all issues now.

its because most consoles don't even support 2019 yet. tell sony and sega and nintendo and xbox to get on the ball and upgrade their **** LOL

[dwbolson]

Thanks frostic. Moving up to 4.25.3 did solve my listed issues and more. Now to figure out how to get collisions between static geometry collections and skeletal meshes...

[theProfessor]

Is there anyway to get the BP's from 4.25 into 4.26 p1?

[Hyunwoo Kang]

How to Disable Chaos 4.26 p1 ?

[Rainoxer]

Hello, I have multiple questions related to performances & optimization :

• Is it possible with C++/BP to tell a chunk to automatically enter sleep mode when its speed goes under a determined value, without using sleep fields? Sleep fields are not really flexible, in Epic's demo they are placed under buildings so they don't take into account the case when your chunk gets destroyed at 3rd floor, gets blocked by the 2nd floor that is still intact and the sleep field is at ground level...

• An alternative to the previous question is to simply delete small chunks when they are separating from the original mesh, instead of sleeping them. But I don't know how to do this. I tried using the "Break BreakChaosEvent" node within a geometry collection promoted to blueprint, and linked the "component" return of the node to a "DestroyComponent" node : it seems it targets the entire collection instead of generated chunks, and it's crashing the game + the editor.

If I link the "Component" output to a function node "DestroyComponent" then the target is actually the geometry collection instead of the generated chunks, and the game + editor crash when testing anyway.



I've seen that it is possible to generate break data and filter it by mass/speed/volume in a Chaos Solver Actor but I have no idea if it's related to the chunks or the original collection, and I don't know how to use this generated data.

[V0xFire]

Rainoxer you could use a field for this right, the individual fractures should be affectable as they are able to be disabled or killed individually im sure there is a threshold somewhere for how many particles can be under simulation at once

Did you have any luck using spawning Niagara particles from destruction data?

[Rainoxer]

Rainoxer you could use a field for this right

No I cannot because sleep/disable fields are usually static & placed on the ground, which means if a chunk separates from its mesh on the 8th floor of a building but gets stopped by the 7th floor, it won't stop simulating because it won't enter the field.
And I can't place a field on the 7th floor because it would disable the destruction of this floor.

I really need to find a way to destroy the small chunks as soon as they separate from the original mesh.
My goal is to be able to simulate an entire skyscraper falling down (I need it dynamic not pre-cached) with a good framerate. So only the large pieces that could affect gameplay by hurting players or providing cover should be simulated. Usually, that's not a lot to simulate because we are talking about things at least 1m^3 large.
Maybe you are wondering why I still want to have chunks as small as 10cm^3 if I delete them when they separate? Simply for bullet holes and other small damages. It depends of the material by the way. For example, steel beams that are usually supporting the weight of skyscrapers are not as brittle as concrete.

[Ahmed.T_UK]

How to Disable Chaos 4.26 p1 ?

Would like to know too.

[theProfessor]

Would like to know too.

Delete it.

[unit23]

Can I use Chaos in 4.25.3 retail? The plug-in is installed per default (ChaosEditor Beta 1.0), but there is no 'Fracture' mode avail! Help!

[theProfessor]

Can I use Chaos in 4.25.3 retail? The plug-in is installed per default (ChaosEditor Beta 1.0), but there is no 'Fracture' mode avail! Help!

Chaos is in 4.26 p3(launcher). It is working OK. A little slow with GC with large number of fracturing. Here is my youtube link. https://www.youtube.com/channel/UC3N...apPAMqXJsaVBWA

[unit23]

Chaos is in 4.26 p3(launcher). It is working OK. A little slow with GC with large number of fracturing. Here is my youtube link. https://www.youtube.com/channel/UC3N...apPAMqXJsaVBWA

Thanks. The issue I have, need to wait for the stable 4.26 release. Just wanted to add some destructible meshes, but not even the old APEX feature is available in 4.25.3, and the documentation page is not updated either. VictorLerp

[Rainoxer]

Can I use Chaos in 4.25.3 retail? The plug-in is installed per default (ChaosEditor Beta 1.0), but there is no 'Fracture' mode avail! Help!

The plugin isn't installed by default in 4.25. You need to :

• Download 4.25 on Github and place it in a folder that is close to your disk's root (if the path is too long, the download/compilation will fail)
• Modify the UE4Editor.Target.cs file located in YourDisk\YourPathToTheEngine\UnrealEngine-4.25.3-release\Engine\Source\UE4Editor.Target.cs by adding these lines to build & activate Chaos :

bCompileChaos = true;
bUseChaos = true;

I did not follow the documentation, I did not replace

BuildEnvironment = TargetBuildEnvironment.Shared;

with

BuildEnvironment = TargetBuildEnvironment.Unique;

because it doesn't work.

• Build the engine
• Launch it from Visual Studio by debugging or use YourDisk\YourPathToTheEngine\UnrealEngine-4.25.3-release\Engine\Binaries\Win64\UE4Editor.exe and create a new project
• This is normal if you can't launch the project. In this case, open the file YourDisk\PathToYourProject\YourProjectName\Source\YourProjectEditor.Target.cs and add :

bCompileChaos = true;
bUseChaos = true;

(That's another thing you can't find in the documentation...)

• Save the file, restart the editor, launch the project, and then you have to go in the plugins manager to activate all these plugins :

- Chaos Editor

- Chaos Solver

- Chaos Niagara

- Planar Cut

- Editable Mesh

- Geometry

- Geometry Cache

- Field System

• Restart the editor to activate the plugins
• Open the fracture mode using the buttons I circled in red in the screenshot.

About using it for a project, it's not recommended in 4.25. Use 4.26 instead.

[unit23]

Rainoxer Thank you for the detailed rundown, though I will wait for stable 4.26 until i touch Chaos.