Unreal Engine Issues

ParticlePosition doesn't use Previous values

FHLSLMaterialTranslator::ParticlePosition does not return Previous information when request which can result in bad motion vector calculation. ...

NPC - Texture Sample DI does not work on Niagara Parameter Collections

Texture sample DIs no longer work when used with Niagara Parameter Collections. This seems to affect Volume Texture DIs based on customer reports, but I have not confirmed this.  ...

HeterogeneousVolumeComp doesn't render properly using DynamicMaterialInstance created in Construction Script

Plugin dependencies causing RI parameter initialization failures (UDN)

Error on some Niagara emitters using the WindForce module: LogNiagaraEditor: Error: Invalid input type found while attempting initialize new rapid iteration parameters. Function Node: /Game/FX/Expl ...

Niagara persistent debug draw bug

It is not possible to set the RotationNormalizedAngle to a value different from those you get from an input map. For example, you cannot set it to a value from a make float once created inside the m ...

Default Wireframe View within the Niagara Preview Window is Difficult to Visualize

The environment geo is getting in the way and the particle's wireframe outline is the same color as the environment. A current workaround it going to the Preview Scene Settings and turning off the e ...

Attribute Reader + Torus Shape Location module cause NaNs in CPU Niagara systems

It appears using the attribute reader with the shape location module set to torus will cause NaNs. The log mentions Sphere Radius among them, which should not be used with the torus mode. ...

Getting Emitter.NumParticles on Niagara's GPU compute sim returns 0

This problem looks like the following parameters are not defined correctly. The correct parameter is Engine_Emitter_NumParticles. Engine_Emitter_NumParticles and PREV_Engine_Emitter_NumParticles .\ ...

NiagaraComponent attached to the character won't stay active when travelling to a new level using seamless travel

The pawn character is added to APlayerController::GetSeamlessTravelActorList, so it'll be persisted during server travel. The Niagara component is spawned during BeginPlay and activated manually. W ...

Preview rendering does not update when slider is moved below 0.0 in timeline on in Niagara Editor.

Workaround in UE5.3:  UNiagaraComponent::TickComponent             if (AgeDiff < 0.0f)             {                 SystemInstanceController->Reset(FNiagaraSystemInstance::EResetMode::ResetAl ...