0x00007ff6579b32a1 UObjectBase::IsValidLowLevel() [UnrealEngine\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectBase.cpp:290] 0x00007ff6566393c5 SNiagaraUISystemWidget::CreateSlateMaterialBrush() [Plugins\UIPlugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\SNiagaraUISystemWidget.cpp:79] 0x00007ff656635a58 SNiagaraUISystemWidget::AddRenderData() [Plugins\UIPlugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\SNiagaraUISystemWidget.cpp:60] 0x00007ff656637c14 UNiagaraUIComponent::AddSpriteRendererData() [Plugins\UIPlugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\NiagaraUIComponent.cpp:175] 0x00007ff65663b076 UNiagaraUIComponent::RenderUI() [Plugins\UIPlugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\NiagaraUIComponent.cpp:78] 0x00007ff65663a2d0 SNiagaraUISystemWidget::OnPaint() [Plugins\UIPlugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\SNiagaraUISystemWidget.cpp:42] 0x00007ff657bfd06c SWidget::Paint() [UnrealEngine\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1393] 0x00007ff657e57b55 SBox::OnPaint() [UnrealEngine\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SBox.cpp:293]

There are a few issues with trying to compile in 5.1. This is the only plugin at this point were having issues with you trying to go to 5.1. Might you have already tested this and possibly have a fix? :D

If not, may I request of you, given you have some free time to do so, update this to 5.1 please?

Thank you, Darinius

When a color curve is used in Niagara particle system, we just see the wrong color caused by a little mistake in NiagaraUIComponent.cpp(line 424). Pls use CurrentDataIndex instead to make the color right.

With Slate Global Invalidation enabled, NiagaraWidgets do not properly render. They are being cached and never "invalidated" and they are not volatile. I don't know very much about the Niagara rendering system, but it seems likely that these widgets should just be marked volatile.

Note: This cannot be reproduced in the "Selected Viewport" mode, as that seems to have Global Invalidation disabled always. You need to run the game in a "New Editor Window (PIE)" and ensure that global invalidation is enabled (can be done via console command: Slate.EnableGlobalInvalidation 1)

I was seeing this is on UE5 Preview, and have not tested if UE4 is any different.

Hi. I've encountered some problems with the plugin since upgrading to 5.1. Mainly it doesn't seem to work in packaged builds (shipping & development), but it works fine in editor. Previously I've used the plugin in UE 5.0 and it worked fine in both packaged builds and editor.

Here is a stack trace with the error that i'm getting:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000218

Win64_Shipping!UNiagaraUIComponent::RenderUI() [...\Plugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\NiagaraUIComponent.cpp:87]
Win64_Shipping!SNiagaraUISystemWidget::OnPaint() [...\Plugins\NiagaraUIRenderer\Source\NiagaraUIRenderer\Private\SNiagaraUISystemWidget.cpp:43]
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SConstraintCanvas::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SBox::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SOverlay::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SCompoundWidget::OnPaint()
Win64_Shipping!SObjectWidget::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SConstraintCanvas::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SOverlay::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SBox::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SOverlay::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SPanel::PaintArrangedChildren()
Win64_Shipping!SPanel::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SPanel::PaintArrangedChildren()
Win64_Shipping!SPanel::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SCompoundWidget::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SCompoundWidget::OnPaint()
Win64_Shipping!SViewport::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SPanel::PaintArrangedChildren()
Win64_Shipping!SPanel::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SOverlay::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SCompoundWidget::OnPaint()
Win64_Shipping!SWidget::Paint()
Win64_Shipping!SWindow::PaintSlowPath()
Win64_Shipping!FSlateInvalidationRoot::PaintInvalidationRoot()
Win64_Shipping!SWindow::PaintWindow()
Win64_Shipping!FSlateApplication::DrawWindowAndChildren()
Win64_Shipping!FSlateApplication::PrivateDrawWindows()
Win64_Shipping!FSlateApplication::TickAndDrawWidgets()
Win64_Shipping!FSlateApplication::Tick()
Win64_Shipping!FEngineLoop::Tick()
Win64_Shipping!GuardedMain()
Win64_Shipping!GuardedMainWrapper()
Win64_Shipping!LaunchWindowsStartup()
Win64_Shipping!WinMain()
Win64_Shipping!__scrt_common_main_seh() [d:\a01\_work\2\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

UE version: 5.1 Plugin version: Latest (1.1.4 for UE 5.1)

More of a future concern and also does seem like a warning by epic devs about using that as it "exposes internals that may be concurrently accessed".

Is there a safer more future proof way of getting the emitters?

Hi,

We observed a curious issue at the company I'm working for, I saw it mentioned once in the UE forums but without any details or resolution.

The FX does not work in shipped build but shows up just fine in preview/PIE when using an empty template emitter in the Niagara System asset. I dont know exactly what changes between the different templates, but it worked again when I used a Fountain template which I adjusted to the config we had in the empty template.

UE version: 4.27.2 NiagaraUI version: 1.1.0

Make a repository just for the project and use this repository for the plugin, then add the plugin repository as a git submodule on the project repository. This will make it easier to add the plugin to other projects as a git submodule and keep the plugin updated.

Example of a project doing this: https://github.com/sinbad/SPUDExamples https://github.com/sinbad/SPUD