NiagaraFluids Grid3D_FLIP_Pool error

Development Programming & Scripting
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1

I’m trying to package a project using the Grid3D_FLIP_Pool template from the NiagaraFluids plugin in Unreal Engine, without modifying the template itself.

I’ve created an Actor in C++, and added a NiagaraComponent to it in the constructor like this:

static ConstructorHelpers::FObjectFinder<UNiagaraSystem> NiagaraSystemFinder(TEXT("/Script/Niagara.NiagaraSystem'/Game/VFX/NS_Pool.NS_Pool'"));
if (NiagaraSystemFinder.Succeeded())
{
	NiagaraSystem = NiagaraSystemFinder.Object;
}

After writing the code as above and compiling the project (which succeeds), I see the following error message in the output log:

LogNiagara: Error: Failed to create default object for compiled variable "User.GeometryCollectionCollisions". Perhaps missing a plugin for your project?

And when I try to package for Windows, the process fails with an error related to the User.GeometryCollectionCollisions parameter.

How can I fix this? Is there a required plugin or dependency that I need to explicitly include in the project or build configuration?

2

Hello there @user_c1876d8f768c16781a39e6d42f29b68c9702c753f075f472157bd1!

From your provided log, it sounds like certain plugins are either not enabled, or not detected in your pack process. As a first step, please make sure that the following plugins are enabled in your project:

  • Chaos Niagara
  • Geometry Collection
  • Niagara Fluids

After that, please double-check that said plugins are present in your .uproject file when cooking.

3

I’m currently using Unreal Engine 5.5.
Both Niagara Fluids and Chaos Niagara are added and enabled.
There is no plugin named “Geometry Collection”, so I added a geometry asset that contains a Geometry Collection Container instead.

Also, when I try to manually add "GeometryCollection" to the .uproject file, it says that the plugin doesn’t exist.

	"Plugins": [
		{
			"Name": "ModelingToolsEditorMode",
			"Enabled": true,
			"TargetAllowList": [
				"Editor"
			]
		},
		{
			"Name": "NiagaraFluids",
			"Enabled": true
		},
		{
			"Name": "ChaosClothAsset",
			"Enabled": true
		},
		{
			"Name": "ChaosNiagara",
			"Enabled": true
		},
		{
			"Name": "Geometry Collection",
			"Enabled": true
		}
	]

After writing this post, I ran a number of tests:

  1. If I place the Niagara system directly in the scene without using any C++ code, packaging succeeds.

  2. I created a new plugin and copied the same code into the plugin’s C++ module, and packaging succeeds. (The Build.cs and .uplugin files are configured exactly the same as in the main project.)

  3. If I use LoadObject to load the Niagara system in BeginPlay, packaging succeeds as well.

  4. The issue only occurs when I try to load the Niagara system using a path in C++ via ConstructorHelpers.

  5. When I try to edit the Niagara system asset in the editor while it’s referenced by ConstructorHelpers with a path, the editor immediately crashes upon opening the asset.
    (If I comment out the ConstructorHelpers code, the editor opens the Niagara system normally and allows editing without any issues.)