Unreal Engine Issues

Allowed Material Slots in the Sample Static Mesh module is not working properly.

It is behaving correctly in 4.27.2. ...

Sprite does not have a UV1 G channel.

The R channel of UV1 is not a problem. ...

Some Niagara Fluid systems are not visible in a packaged project

Previously packaging caused a crash with this system. This was fixed, but now the system is no longer visible when packaged. ...

Crash when trying to copy-paste nodes in a module graph

The nodes I tried to copy are in the screenshot. Hit an ensure before the crash: Ensure condition failed: ScriptVariable != nullptr [NiagaraScriptGraphViewModel.cpp][Line: 294] Script variable sh ...

Ensure thrown when applying a Linear Color User Exposed Variable in a Niagara Emitter

This is a regression tested in //UE4/Release-4.27 CL18319896. Ensure thrown when applying a Linear Color User Exposed Variable in a Niagara Emitter. ...

NiagaraSystem is compiled every time when first loaded in the editor

If you are using a large amount of Niagara, you will experience excessive load times in PIE even if nothing is changed. The following code change seems to be effective as an interim response. void ...

A niagara emitter with an empty renderer module does not return a position in the package

Niagara Fluids Grid3D_Gas_Explosion causes a crash

Placing Grid3D_Gas_Explosion into a level then packaging the level for windows will crash the packaged project. The package will give an error that it crashed while loading and quit.  This does not ...

Rarely, unmodified Niagara will cause diffs and bloat the patch.

Attached is a project that picks up Niagara from the content sample. The probability of reproduction is about 1/10. The simpler the project, the lower the reproduction probability. I am attaching ...

Parameter distributions can be reset to None in Cascade Particle Systems, causing Cascade to Niagara conversion to crash the editor.

Cascade to Niagara conversion causes the editor to crash due to any distribution parameter in the Particle Emitter being reset to none. Repro Rate: 4/4 Tested this in //UE4/Release-4.27 @ CL# 1831 ...