So I tried to correct the project’s .target.cs, as the last error message told me to do, but I’m still failing to compile…
About the 2nd error in the screenshot, which is in french, it’s telling me that Build.bat failed with code 5. Check if I have the rights to execute it…
I finally solved all my problems. (edit : wrong)
told us to do the steps with the engine, or the project files, but to finally be able to start a project I had to also add :
BuildEnvironment = TargetBuildEnvironment.Shared;
bCompileChaos = true;
in the project’s Target.cs file.
For me, it was impossible to start a project by making the modifications for the engine only.
Now I need to find the tool to fracture a mesh…
Someone know where it is?
EDIT : I uninstalled the EG launcher UE4.23 version because I was wondering if the project was using this one or the GitHub version that is also installed.
So after uninstalling the EG launcher UE4.23 version, I tried starting the GitHub one from Visual Studio and I got this error (see the screenshot).
How do I solve it? I suppose I need to modify one of the .Target.cs files, but which one and how? I tried adding “Target.Platform = UnrealTargetPlatform.Win64;” in all the 4 .Target.cs files but it didn’t solve this error… Instead it added 300+ compilation errors. 
@Rainoxer, maybe because you’re not targetting UE4? Try changing the dropdown from UnrealBuildTool to UE4 or right-click on UE4 in the solution explorer and click Set as StartUp Project.
Did anybody try Chaos on mobile phone (Android, iOS)? I am curious whether it works or not and its performance without INTEL_ISPC optimization.
For some reason I wasn’t able to switch UnrealBuildTool to UE4 in the dropdown menu. That’s something I already investigated.I installed all required VS packages for Unreal, of course.
But thanks to your solution by right clicking UE4 in the solution explorer, it works now! 
Would anyone using P4 do a short video with a Geometry collection and fps that shoots the GC and it is fractured. Noon I would just like to see if it is possible. Thanks. OBS is great for videos.
Anyone know how to solve this error?
Disable HoloLens or modify the HoloLens.plugin to be loaded PostConfig like it says in the error.
I have no idea how to do this…
According to HoloLensAR.uplugin, it’s supposed to be already disabled… And it’s also set on PostConfig loading…
@Rainoxer, I had changed my UE4Editor.Target.cs to set [FONT=courier new]BuildEnvironment = TargetBuildEnvironment.Shared;, to try and get it working, but I got that error. So after I changed it back to [FONT=courier new]BuildEnvironment = TargetBuildEnvironment.Unique;, I was able to get load a new project.
Mine was already set on “Unique” so I did the opposite of what you said and set it on “Shared”.
The engine now starts!!! 
I’m still having problems…
The button to create a Geometry Collection is not showing up…
I activated all the plugins required for Chaos…
It is in the Fracture Editor. You need to compile P4 from github.
I’m using the Github version…
The problem is that I am not able to see this tab, but I managed to open it anyway. According to what I saw in this thread, the interface changed between Preview 2 & Preview 4. Watch my screenshots :
Great work. You should be able to created the Geo. Collection. Use the fps to fracture. Let me know if you can shoot the GC and fracture it. I couldn’t this to work.
This is the solution 
But I have no idea how to create a BP acting as an anchor field.
Yes, I have seen the video. I don’t have the BP’s. Noon is working on a tutorial I think.
An NVidia engineer working on the BLAST GameWork once told me (about Blast) : if you fracture a mesh in 4 chunks, then all the 4 chunks will be loaded when you break a part of the mesh. So it’s better to fracture a single mesh/chunk in 4 than in 20, for performances. Else, breaking a single chunk of your mesh would load all the 19 others.
(You can still fracture chunks in 4 smaller chunks to create children)
Is it working the same with Chaos?
Hello everyone,
I’d like to try Chaos so I decided to follow the steps described by . But, unfortunately, when I click on the GitHub link, I have a "Page not found’ with a beautiful “404 this is not the web page you are looking for.”
I’m from France, is there any link with the country ?
Otherwise, can someone help me ?
You need to create a GitHub account and inside your profile in Epic Games you need to link that GitHub account. Once you do that, your access will be granted.