Unreal Engine Issues

Niagara Mesh Particles do not work with Refractions from Ray Traced Translucency

Ray traced reflections skewed with un-combined meshes

MipLevel sample mode doesn't work as expected in Adaptive RVT

Audio section has incorrect duration when pitch is changed.

Sequencer determines audio duration based on the sound, which does not factor in pitch information, so the duration will be incorrect, leading to incorrect playback. ...

UAnimInstance::GetInstanceTransitionTimeElapsed does NOT consider TransitionIndex

GetInstanceTransitionTimeElapsed doesn't use TransitionIndex. float UAnimInstance::GetInstanceTransitionTimeElapsed(int32 MachineIndex, int32 TransitionIndex) { // Just an alias for readabili ...

The drawing order of widgets becomes wrong when GlobalInvalidation is enabled,

When trying to create a widget with specific steps, the drawing order may not be correct. This is not reproduced when Global Invalidation is disabled, and the state can be restored. This issue is pr ...

[Audio Analysis][Ensure] - Sound Submix Spectral Analyzer Delegate Throws Ensure when Analysis Started Before the Delegate is Added

Hit the following Ensure when trying to use the Spectrum Analyser. Also hit this in 4.26 so it doesn't appear to be a regression. Occurs with any of the following Band Settings or when creating you ...

Problem importing broken FBX

An FBX exported from 3DEXCITE DELTAGEN fails to parse correctly in the latest FBX SDK and crashes the UE importer. This FBX is automatically repaired when loaded into Maya (citing "polygons with ov ...

RebuildHLOD UAT script doesn't properly handle the -nop4 command line flag

The script performs P4 commands even if -NoP4 was specified. It should properly handle -NoP4 by checking for  if (CommandUtils.P4Enabled) ...

A WaterBody blueprint class with an added component will not compile if Blueprint Nativization is enabled

This is Not a regression. Tested in: //UE4/Release-4.26.2 CL15973114 Binary - Reproduced //UE4/Release-4.27.1 CL17735300 Binary - Reproduced When adding a component to a Water Body actor it should ...