Unreal Engine Issues

Using Collision in Niagara without an Update Age module will prevent any particles from spawning

Using Collision without Update Age will prevent any particles from spawning. In Collision Query and Response DataInstance.Alive has a default value of false. If no other module sets DataInstance.Ali ...

Niagara viewport does not adjust exposure when set to auto

The Niagara viewport does not adjust exposure when using the Auto setting for exposure. This is especially pronounced when using physically based values for skylight intensity.  ...

Niagara Vector Field CPU access Error prevents its use in projects

Niagara VectorFields do not function properly since "Fix CPU Access" changes are not persistently saved. After every Editor restart or reopening projects, the Niagara-VectorField driven Emitter and ...

Particle Systems Don't Play In Reopened Levels With ES 3.1 Enabled

Particle systems placed in levels don't play as expected on level load when using ES 3.1 Preview. Found in 4.24.1 CL#10757647 Reproduced in 4.25 Main CL#11115840 ...

In Niagara's "CalculateParticleRadius", StaticSwitch Input is connected

This may not compile properly. Should be fixed. ...

Input pins are displayed when "StaticSwitch" is used in "Dynamic Input Script" of Niagara

The pin is missing the checkbox or dropdown to set the switch value on the function call node. It should only look like the screenshot if the switch value is propagated to the next higher caller. ...

Regression: Skeletalmeshreproduction node do not show mesh when the mesh is not SK_Mannequin in 4.24

SkeletalMeshReproduction node stopped showing meshes other than SK_Mannequin. ...

Interpolators of Niagara Dynamic Parameters Need "nointerpolation".

Niagara Systems Don't Scale With Skeletal Meshes When Called From a Montage

When a Niagara System is called from a montage is doesn't scale with the skeletal mesh that uses the montage. Attached is an example project. Found in 4.24.1 CL#1077647 Reproduced in 4.23.1 CL# 9 ...

Niagara Particles in Mesh Shape Don't Render in Scene or Editor Preview

Niagara particles aren't rendered in the Niagara Editor Preview or the scene when an emitter is in it. Found in 4.24.1 CL#10756747 Reproduced in 4.25 Main CL#10808197 ...