Unreal Engine Issues

Nanite Meshes with WPO exhibit TSR smearing with Velocity Write during Depth Pass, regardless of Mobility

I set up a test project with different combinations of Nanite/Non Nanite, Movable/Static, and instance and component types, and the only case that seems to not smear at all are the non-nanite Movabl ...

WorldPosition in PostProcessMaterial returns inconsistent results in AfterTonemapping with TSR and TAA

This behavior appears to be a regression new to UE5, as I tested in 4.25 and the issue does not occur. Interestingly, the issue clears up if you switch to No, FXAA, or MSAA antialiasing methods. Th ...

Niagara Mesh Renderer causes GPU hang on IOS 13.4.1

Level instance in unloaded data layer stays loaded.

Push based fast array with net.PushModelSkipUndirtiedFastArrays not replicating across multiple PIE sessions

The conditions for this bug are fairly specific. The actor must be statically placed, with its only replicated property being the fast array, and net.PushModelSkipUndirtiedFastArrays must be enabled ...

PoseSearch::GenerateDDCKey is not deterministic between editor restarts

we need to investigate why between editor restarts the DDC key generation for the motion matching pose search databases is not deterministic, causing the assets to be rebuilt ...

Electra video playback fails if project or package is under multibyte characters path

The URL parser encodes the input path to a URL-encoded path even if it is local, so if the path contains unicode characters (such as Japanese Kanji ), the media file cannot be read. Following worka ...

ISM Component in an instanced BP does not take into account changes to NumCustomDataFloats from the BP class

PerInstanceSMCustomData is bulk serialized and doesn't get changed on the BP instance when changing NumCustomDataFloats, possibly causing out of bounds array access leading to a crash. Possible sol ...

Animation tracks reset to ref pose when editing actor properties.

Editing an actor's properties in a sequence causes the animation to go to ref pose. ...

open asset in editor crash (Objects have the same fully qualified name but different paths)

in 4.27 open this asset could not crash ,but 5.0.2 could get crashed ...